Astrophysical Journal Supplement Series最新文献

{"title":"IMPROVED Cr II log(<i>gf</i> ) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937.","authors":"J E Lawler,&nbsp;C Sneden,&nbsp;G Nave,&nbsp;E A Den Hartog,&nbsp;N Emrahođlu,&nbsp;J J Cowan","doi":"10.3847/1538-4365/228/1/10","DOIUrl":"https://doi.org/10.3847/1538-4365/228/1/10","url":null,"abstract":"<p><p>New emission branching fraction (BF) measurements for 183 lines of the second spectrum of chromium (Cr II) and new radiative lifetime measurements from laser-induced fluorescence for 8 levels of Cr⁺ are reported. The goals of this study are to improve transition probability measurements in Cr II and reconcile solar and stellar Cr abundance values based on Cr I and Cr II lines. Eighteen spectra from three Fourier Transform Spectrometers supplemented with ultraviolet spectra from a high-resolution echelle spectrometer are used in the BF measurements. Radiative lifetimes from this study and earlier publications are used to convert the BFs into absolute transition probabilities. These new laboratory data are applied to determine the Cr abundance log <i>ε</i> in the Sun and metal-poor star HD 84937. The mean result in the Sun is 〈log<i>ε</i> (Cr II)〉 = 5.624±0.009 compared to 〈log<i>ε</i>(Cr I)〉 = 5.644 ± 0.006 on a scale with the hydrogen abundance log <i>ε</i>(H) = 12 and with the uncertainty representing only line-to-line scatter. A Saha (ionization balance) test on the photosphere of HD 84937 is also performed, yielding 〈log<i>ε</i>(Cr II)〉 = 3.417 ± 0.006 and 〈log <i>ε</i>(Cr I, lower level excitation potential E. P. >30 eV)〉 = 3.3743±30.011 for this dwarf star. We find a correlation of Cr with the iron-peak element Ti, suggesting an associated nucleosynthetic production. Four iron-peak elements (Cr along with Ti, V, and Sc) appear to have a similar (or correlated) production history-other iron-peak elements appear not to be associated with Cr.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"228 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3847/1538-4365/228/1/10","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35060272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transition Energies and Absorption Oscillator Strengths for , , and Band Systems in N2","authors":"C. Lavín, A. M. Velasco","doi":"10.3847/1538-4365/aa656e","DOIUrl":"https://doi.org/10.3847/1538-4365/aa656e","url":null,"abstract":"Theoretical transition energies and absorption oscillator strengths for the (v′ = 0–2, 5, 7, 8) − and (v′ = 0, 2) − (v″ = 0–14) Rydberg bands, and (v′ = 0–9, 11, 12, 14–19, 21, 22) − (v″ = 0–14) valence bands of molecular nitrogen are reported. The strong interaction between states has been dealt with through a vibronic interaction matrix. As a consequence of the Rydberg-valence interaction, irregularities in the vibrational structure of the above band systems are observed. Good agreement is found with the scarce high-resolution data that are available for oscillator strengths. The new band oscillator strengths reported here may be useful for a reliable interpretation of the spectra from atmospheres of the Earth, Titan, and Triton, where is the mayor constituent.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"229 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3847/1538-4365/aa656e","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70000806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Characteristics of Footpoints of Solar Magnetic Flux Ropes during the Eruption","authors":"Xin Cheng, M. Ding","doi":"10.3847/0067-0049/225/1/16","DOIUrl":"https://doi.org/10.3847/0067-0049/225/1/16","url":null,"abstract":"We investigate the footpoints of four erupted magnetic flux ropes (MFRs) that appear as sigmoidal hot channels prior to the eruptions in the Atmospheric Imaging Assembly high temperaure passbands. The simultaneous Helioseismic and Magnetic Imager observations disclose that one footpoint of the MFRs originates in the penumbra or penumbra edge with a stronger magnetic field, while the other in the moss region with a weaker magnetic field. The significant deviation of the axis of the MFRs from the main polarity inversion lines and associated filaments suggests that the MFRs have ascended to a high altitude, thus being distinguishable from the source sigmoidal ARs. The more interesting thing is that, with the eruption of the MFRs, the average inclination angle and direct current at the footpoints with stronger magnetic field tend to decrease, which is suggestive of a straightening and untwisting of the magnetic field in the MFR legs. Moreover, the associated flare ribbons also display an interesting evolution. They initially appear as sporadical brightenings at the two footpoints of and in the regions below the MFRs and then quickly extend to two slender sheared J-shaped ribbons with the two hooks corresponding to the two ends of the MFRs. Finally, the straight parts of the two ribbons separate from each other, evolving into two widened parallel ones. These features mostly conforms to and supports the recently proposed three-dimensional standard CME/flare model, i.e., the twisted MFR eruption stretches and leads to the reconnection of the overlying field that transits from a strong to weak shear with the increasing height.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"225 1","pages":"16"},"PeriodicalIF":8.7,"publicationDate":"2016-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3847/0067-0049/225/1/16","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70001217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RRC-BlecicEtal-2016-ApJS-TEA","authors":"J. Blecic, J. Harrington, M. Bowman","doi":"10.5281/ZENODO.50378","DOIUrl":"https://doi.org/10.5281/ZENODO.50378","url":null,"abstract":"","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"1 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2016-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71085160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conditional Deletion of Bmal1 in Ovarian Theca Cells Disrupts Ovulation in Female Mice.","authors":"Amanda L Mereness, Zachary C Murphy, Andrew C Forrestel, Susan Butler, CheMyong Ko, JoAnne S Richards, Michael T Sellix","doi":"10.1210/en.2015-1645","DOIUrl":"10.1210/en.2015-1645","url":null,"abstract":"<p><p>Rhythmic events in female reproductive physiology, including ovulation, are tightly controlled by the circadian timing system. The molecular clock, a feedback loop oscillator of clock gene transcription factors, dictates rhythms of gene expression in the hypothalamo-pituitary-ovarian axis. Circadian disruption due to environmental factors (eg, shift work) or genetic manipulation of the clock has negative impacts on fertility. Although the central pacemaker in the suprachiasmatic nucleus classically regulates the timing of ovulation, we have shown that this rhythm also depends on phasic sensitivity to LH. We hypothesized that this rhythm relies on clock function in a specific cellular compartment of the ovarian follicle. To test this hypothesis we generated mice with deletion of the Bmal1 locus in ovarian granulosa cells (GCs) (Granulosa Cell Bmal1 KO; GCKO) or theca cells (TCs) (Theca Cell Bmal1 KO; TCKO). Reproductive cycles, preovulatory LH secretion, ovarian morphology and behavior were not grossly altered in GCKO or TCKO mice. We detected phasic sensitivity to LH in wild-type littermate control (LC) and GCKO mice but not TCKO mice. This decline in sensitivity to LH is coincident with impaired fertility and altered patterns of LH receptor (Lhcgr) mRNA abundance in the ovary of TCKO mice. These data suggest that the TC is a pacemaker that contributes to the timing and amplitude of ovulation by modulating phasic sensitivity to LH. The TC clock may play a critical role in circadian disruption-mediated reproductive pathology and could be a target for chronobiotic management of infertility due to environmental circadian disruption and/or hormone-dependent reprogramming in women. </p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"49 1","pages":"913-27"},"PeriodicalIF":4.8,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1210/en.2015-1645","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82616977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decision aids for people considering taking part in clinical trials.","authors":"Katie Gillies, Seonaidh C Cotton, Jamie C Brehaut, Mary C Politi, Zoe Skea","doi":"10.1002/14651858.CD009736.pub2","DOIUrl":"10.1002/14651858.CD009736.pub2","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Background: &lt;/strong&gt;Several interventions have been developed to promote informed consent for participants in clinical trials. However, many of these interventions focus on the content and structure of information (e.g. enhanced information or changes to the presentation format) rather than the process of decision making. Patient decision aids support a decision making process about medical options. Decision aids support the decision process by providing information about available options and their associated outcomes, alongside information that enables patients to consider what value they place on particular outcomes, and provide structured guidance on steps of decision making. They have been shown to be effective for treatment and screening decisions but evidence on their effectiveness in the context of informed consent for clinical trials has not been synthesised.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Objectives: &lt;/strong&gt;To assess the effectiveness of decision aids for clinical trial informed consent compared to no intervention, standard information (i.e. usual practice) or an alternative intervention on the decision making process.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Search methods: &lt;/strong&gt;We searched the following databases and to March 2015: Cochrane Central Register of Controlled Trials (CENTRAL), The Cochrane Library; MEDLINE (OvidSP) (from 1950); EMBASE (OvidSP) (from 1980); PsycINFO (OvidSP) (from 1806); ASSIA (ProQuest) (from 1987); WHO International Clinical Trials Registry Platform (ICTRP) (http://apps.who.int/trialsearch/); ClinicalTrials.gov; ISRCTN Register (http://www.controlled-trials.com/isrctn/). We also searched reference lists of included studies and relevant reviews. We contacted study authors and other experts. There were no language restrictions.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Selection criteria: &lt;/strong&gt;We included randomised and quasi-randomised controlled trials comparing decision aids in the informed consent process for clinical trials alone, or in conjunction with standard information (such as written or verbal) or alongside alternative interventions (e.g. paper-based versus web-based decision aids). Included trials involved potential trial participants, or their guardians, being asked to consider participating in a real or hypothetical clinical trial.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Data collection and analysis: &lt;/strong&gt;At least two authors independently assessed studies for inclusion, extracted reported data and assessed risk of bias. Findings were pooled where appropriate. We used GRADE to assess the quality of the evidence for each outcome.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Main results: &lt;/strong&gt;We identified one study (290 randomised participants) that investigated the effectiveness of decision aids compared to standard information in the informed consent process for clinical trials. This study reported two separate decision aid randomised controlled trials (RCTs). The decision aid trials were nested within two different parent trials focusing on breast cancer in postmenopausal women. One tri","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"64 1","pages":"CD009736"},"PeriodicalIF":8.8,"publicationDate":"2015-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8725643/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82640038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE MOSFIRE DEEP EVOLUTION FIELD (MOSDEF) SURVEY: REST-FRAME OPTICAL SPECTROSCOPY FOR similar to 1500 H-SELECTED GALAXIES AT 1.37 <= z <= 3.8","authors":"M. Kriek, A. Shapley, N. Reddy, B. Siana, A. Coil, B. Mobasher, W. Freeman, L. D. Groot, S. Price, R. Sanders, I. Shivaei, G. Brammer, I. Momcheva, R. Skelton, P. Dokkum, K. Whitaker, J. Aird, Mojegan Azadi, M. Kassis, J. Bullock, C. Conroy, R. Davé, D. Keres̆, M. Krumholz","doi":"10.1088/00647-0049/218/2/15","DOIUrl":"https://doi.org/10.1088/00647-0049/218/2/15","url":null,"abstract":"Author(s): Kriek, Mariska; Shapley, Alice E; Reddy, Naveen A; Siana, Brian; Coil, Alison L; Mobasher, Bahram; Freeman, William R; de Groot, Laura; Price, Sedona H; Sanders, Ryan; Shivaei, Irene; Brammer, Gabriel B; Momcheva, Ivelina G; Skelton, Rosalind E; van Dokkum, Pieter G; Whitaker, Katherine E; Aird, James; Azadi, Mojegan; Kassis, Marc; Bullock, James S; Conroy, Charlie; Dave, Romeel; Keres, Dusan; Krumholz, Mark","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"218 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60355198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finding Warm Debris Disks with WISE Around Bright Stars","authors":"R. Patel, A. Heinze, S. Metchev","doi":"10.5281/ZENODO.10573","DOIUrl":"https://doi.org/10.5281/ZENODO.10573","url":null,"abstract":"The WISE All-Sky Survey Catalog presents an opportunity to expand the number of detections of warm (>100K) circumstellar dust in asteroid belt-analog regions. Such detections are useful to statistically constrain the occurrence rate of dusty systems, and imaging campaigns aiming to characterize the morphology of the dust populations can choose their targets form the nearest ( 30μm excesses (289, with 171 in common), even if the latter have been found to have a higher occurrence rate. 114 Finding Warm Debris Disks with WISE Around Bright Stars","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"69 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2014-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71020560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TRANSIT TIMING VARIATION OF NEAR-RESONANCE PLANETARY PAIRS. II. CONFIRMATION OF 30 PLANETS IN 15 MULTIPLE-PLANET SYSTEMS","authors":"Ji-Wei 伟 Xie 谢基","doi":"10.1088/0067-0049/210/2/25","DOIUrl":"https://doi.org/10.1088/0067-0049/210/2/25","url":null,"abstract":"Following on from Paper I in this series, I report the confirmation of a further 30 planets in 15 multiple-planet systems via transit timing variations (TTVs), using the publicly available Kepler light curves (Q0–Q16). All 15 pairs are near first-order mean motion resonances, showing sinusoidal TTVs consistent with theoretically predicted periods, which demonstrate they are orbiting and interacting in the same systems. Although individual masses cannot be accurately extracted based only on TTVs (because of the well known degeneracy between mass and eccentricity), the measured TTV phases and amplitudes can still place relatively tight constraints on their mass ratios and upper limits on their masses, which confirm their planetary nature. Some of these systems (KOI-274, KOI-285, KOI-370, and KOI-2672) are relatively bright and thus suitable for further follow-up observations.","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"210 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0067-0049/210/2/25","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60356681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Infrared Spectra of Polycyclic Aromatic Hydrocarbons with Excess Peripheral H Atoms (H_n-PAHs) and their Relation to the 3.4 and 6.9 µm PAH Emission Features.","authors":"Scott A Sandford,&nbsp;Max P Bernstein,&nbsp;Christopher K Materese","doi":"10.1088/0067-0049/205/1/8","DOIUrl":"https://doi.org/10.1088/0067-0049/205/1/8","url":null,"abstract":"<p><p>Polycyclic aromatic hydrocarbons (PAHs) are likely responsible for the family of infrared emission features seen in a wide variety of astrophysical environments. A potentially important subclass of these materials are PAHs whose edges contain excess H atoms (H_n-PAHs). This type of compound may be present in space, but it has been difficult to assess this possibility because of a lack of suitable laboratory spectra to assist with analysis of astronomical data. We present 4000-500 cm^-1 (2.5-20 µm) infrared spectra of 23 H_n-PAHs and related molecules isolated in argon matrices under conditions suitable for interpretation of astronomical data. Spectra of molecules with mixed aromatic and aliphatic domains show characteristics that distinguish them from fully aromatic PAH equivalents. Two major changes occur as PAHs become more hydrogenated: (1) aromatic C-H stretching bands near 3.3 µm weaken and are replaced with stronger aliphatic bands near 3.4 µm, and (2) aromatic C-H out-of-plane bending mode bands in the 11-15 µm region shift and weaken concurrent with growth of a strong aliphatic -CH₂-deformation mode near 6.9 µm. Implications for interpreting astronomical spectra are discussed with emphasis on the 3.4 and 6.9 µm features. Laboratory data is compared with emission spectra from IRAS 21282+5050, an object with normal PAH emission features, and IRAS 22272+5435 and IRAS 0496+3429, two protoplanetary nebulae with abnormally large 3.4 µm features. We show that 'normal' PAH emission objects contain relatively few H_n-PAHs in their emitter populations, but less evolved protoplanetary nebulae may contain significant abundances of these molecules.</p>","PeriodicalId":8588,"journal":{"name":"Astrophysical Journal Supplement Series","volume":"205 1","pages":""},"PeriodicalIF":8.7,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0067-0049/205/1/8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34128324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}