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JCMT SCUBA-2 Sub-millimeter Observations of AT2018cow JCMT SCUBA-2对AT2018cow的亚毫米波观测
Research notes of the AAS Pub Date : 2024-07-09 DOI: 10.3847/2515-5172/ad6073
I. A. Smith, N. R. Tanvir and D. A. Perley
{"title":"JCMT SCUBA-2 Sub-millimeter Observations of AT2018cow","authors":"I. A. Smith, N. R. Tanvir and D. A. Perley","doi":"10.3847/2515-5172/ad6073","DOIUrl":"https://doi.org/10.3847/2515-5172/ad6073","url":null,"abstract":"We present a reprocessing of all the submillimeter observations of the optical transient AT2018cow that were performed simultaneously at 850 μm (350 GHz) and 450 μm (670 GHz) using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2), the 10,000 pixel bolometer continuum camera on the James Clerk Maxwell Telescope on Maunakea, Hawai’i. A bright source was detected in our initial observations. The peak in the longer wavelength spectrum had just passed through the SCUBA-2 region prior to our first observation.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141588572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of the Abundance of Mercury from the Hg ii Line at 5677.10 Å in Late B-type Stars. IV. HD 149121 (28 Her) and HD 178065 通过 B 型晚期恒星中位于 5677.10 Å 处的 Hg ii 线确定汞的丰度。IV.HD 149121 (28 Her) 和 HD 178065
Research notes of the AAS Pub Date : 2024-07-09 DOI: 10.3847/2515-5172/ad5f95
Richard Monier
{"title":"Determination of the Abundance of Mercury from the Hg ii Line at 5677.10 Å in Late B-type Stars. IV. HD 149121 (28 Her) and HD 178065","authors":"Richard Monier","doi":"10.3847/2515-5172/ad5f95","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5f95","url":null,"abstract":"The weak line of Hg <sc>ii</sc> located at 5677.10 Å is used to measure the mercury abundance in two HgMn stars, HD 149121 (28 Her) and HD 178065. This line is detected at 3<italic toggle=\"yes\">σ</italic> above the noise in the adjacent continuum in both stars. The synthesis of this line confirms a large overabundance of mercury, about +4.57 dex in HD 149121, and +3.70 dex in HD 178065, which is less than the excesses derived from the 3983.93 Å line in earlier studies. The presence of previously reported weak emission lines of Ti <sc>ii</sc> at 6106.50 Å and of Cr <sc>ii</sc> at 6158.62 and 6182.30 Å in the spectrum of HD 178065 is confirmed. The synthesis of other lines close to the Hg <sc>ii</sc> line yields estimates of the abundance deficiencies or excesses relative to solar abundances. Oxygen has a solar abundance (0.00 dex), silicon is deficient (−0.48 dex), iron also (−0.22 dex) and chromium is overabundant in HD 178065.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Gaia DR3 Data of Selected High Galactic Latitude Hα Emission Stars 部分高银河纬度 Hα 发射恒星的盖亚 DR3 数据分析
Research notes of the AAS Pub Date : 2024-07-09 DOI: 10.3847/2515-5172/ad5ff7
Mudumba Parthasarathy
{"title":"Analysis of Gaia DR3 Data of Selected High Galactic Latitude Hα Emission Stars","authors":"Mudumba Parthasarathy","doi":"10.3847/2515-5172/ad5ff7","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5ff7","url":null,"abstract":"Gaia DR3 data of 52 high galactic latitude H<italic toggle=\"yes\">α</italic> emission stars selected from the paper of Stephenson are analyzed. Ten new variable stars and eight new high velocity stars have been found. Details of six post-AGB stars and several other interesting stars are discussed. Many of the stars presented in this paper have Gaia DR3 light curves and spectra. A detailed study of these 52 stars is needed to derive their chemical composition and to further understand their binarity, circumstellar matter and evolutionary status. The astrophysical parameters from the Gaia DR3 data reveal several hot (OBA) and several F and G-type stars in this sample. Some of them are metal-poor stars.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141577781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SupSpec: A Python Package for Measuring the Doppler Shifts of Supernova Spectral Lines SupSpec：用于测量超新星光谱线多普勒频移的 Python 软件包
Research notes of the AAS Pub Date : 2024-07-05 DOI: 10.3847/2515-5172/ad5e6b
Nahum Linhart, Ivy Yao, S. Karthik Yadavalli
{"title":"SupSpec: A Python Package for Measuring the Doppler Shifts of Supernova Spectral Lines","authors":"Nahum Linhart, Ivy Yao, S. Karthik Yadavalli","doi":"10.3847/2515-5172/ad5e6b","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5e6b","url":null,"abstract":"Here we present an open-source Python package, <monospace>SupSpec</monospace>, which aids in finding the velocity structure of spectral features throughout supernova (SN) ejecta. This code is designed to require minimal user interaction and can ingest an arbitrarily large number of spectra. By fitting a Gaussian distribution to the spectral sequence of a single SN over time, it finds the “velocity structure”—the evolution of the velocity of a specific absorption feature over time. <monospace>SupSpec</monospace> is available on GitHub and on Zenodo.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting CO2 Gas Layer Thickness due to Mantle Outgassing in the Exoplanet Census 预测系外行星普查中因地幔排气导致的二氧化碳气层厚度
Research notes of the AAS Pub Date : 2024-07-04 DOI: 10.3847/2515-5172/ad5f30
Eva Stafne and Juliette Becker
{"title":"Predicting CO2 Gas Layer Thickness due to Mantle Outgassing in the Exoplanet Census","authors":"Eva Stafne and Juliette Becker","doi":"10.3847/2515-5172/ad5f30","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5f30","url":null,"abstract":"The exchange of molecules between a planet’s interior and exterior is a major component of planetary development and atmospheric formation. Recently, detailed observational studies of exoplanet atmospheres have become possible, enabling robust testing of planetary outgassing models. In this Note, we apply the Dorn et al. stagnant lid model for outgassing to the observed exoplanet census to produce predictions for the atmospheric scale heights that may be observed. We also model atmospheric mass loss due to photoevaporation to determine if the predicted atmospheres would likely be retained and therefore observable.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
J115307.93+353528.2—Spectroscopic Twin Binary, Composed of Solar Like Stars. Orbital Solution from Poorly Resolved Double-line Structure J115307.93+353528.2-光谱双星，由类似太阳的恒星组成。从解析度较低的双线结构得出轨道解法
Research notes of the AAS Pub Date : 2024-07-04 DOI: 10.3847/2515-5172/ad5f2f
Mikhail Yu. Kovalev, Xuefei Chen and Zhanwen Han
{"title":"J115307.93+353528.2—Spectroscopic Twin Binary, Composed of Solar Like Stars. Orbital Solution from Poorly Resolved Double-line Structure","authors":"Mikhail Yu. Kovalev, Xuefei Chen and Zhanwen Han","doi":"10.3847/2515-5172/ad5f2f","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5f2f","url":null,"abstract":"We present a study of double-lined spectroscopic binary (SB2) J115307.93+353528.2 based on data from the Large Sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) medium resolution survey (MRS). We use full-spectrum fitting to derive radial velocities and spectral parameters, which suggest that this is a “twin” system of two nearly identical stars, which are similar to the Sun. The orbital solution tells us that it is relatively wide pair of stars on slightly eccentric orbit with period P ≃ 206 days. This result shows that LAMOST-MRS data can be used to detect such twin binaries even when double-line structure is poorly resolved in the spectra. Changes of values from single star model analysis allows us to reliably select such SB2 candidate and to make first estimate of the orbital period.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring Viscosity Effects in Accretion Disk Simulations: A Code Comparison between FLASH and Athena 探索吸积盘模拟中的粘度效应：FLASH 和 Athena 的代码比较
Research notes of the AAS Pub Date : 2024-07-02 DOI: 10.3847/2515-5172/ad5d8c
Georgia Amy Richardson and Ryan Jeffrey Farber
{"title":"Exploring Viscosity Effects in Accretion Disk Simulations: A Code Comparison between FLASH and Athena","authors":"Georgia Amy Richardson and Ryan Jeffrey Farber","doi":"10.3847/2515-5172/ad5d8c","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5d8c","url":null,"abstract":"This project investigates the impact of viscosity on the evolution of black hole accretion disks through a comparative analysis between FLASH and Athena simulations. Our focus lies in understanding the role of viscosity in overall disk evolution. We present mass accretion rate plots that reveal near identical patterns in disk evolution when varying viscosity. We emphasize the need for additional code-comparison research, including exploration of a wider variety of codes and physics included to enhance our understanding and confidence in simulated models.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141524987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Color Measurements of Dust Clouds Transiting the White Dwarf J0328-1219 穿越白矮星 J0328-1219 的尘埃云颜色测量结果
Research notes of the AAS Pub Date : 2024-07-01 DOI: 10.3847/2515-5172/ad5d71
Bruce L. Gary and Thomas G. Kaye
{"title":"Color Measurements of Dust Clouds Transiting the White Dwarf J0328-1219","authors":"Bruce L. Gary and Thomas G. Kaye","doi":"10.3847/2515-5172/ad5d71","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5d71","url":null,"abstract":"The transiting dust clouds that orbit the white dwarf (WD) J0328-1219 produce dips with nearly identical depths at g′ and R bands. This resembles a similar finding for WD 1145+017 at near-IR wavelengths, which has been interpreted as requiring an absence of small particles in the dust clouds. Whereas the lack of depth difference at optical wavelengths for J0328-1219 can be used to rule-out the presence of small particles if the dust clouds are optically thin, a constraint on the particle size distribution is not possible if the dust clouds are optically thick.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141524989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detecting Novel Damped Lyα Absorbers in the Intergalactic Medium 探测星际介质中的新型阻尼 Lyα 吸收体
Research notes of the AAS Pub Date : 2024-06-30 DOI: 10.3847/2515-5172/ad5ce0
Katherine C. Lee
{"title":"Detecting Novel Damped Lyα Absorbers in the Intergalactic Medium","authors":"Katherine C. Lee","doi":"10.3847/2515-5172/ad5ce0","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5ce0","url":null,"abstract":"Damped Lyα (DLA) absorbers are a class of quasar absorption line systems that can be used to trace hydrogen evolution and study gas, composition, kinematics, and stellar formation in galaxies or the intergalactic medium in the early universe. In this study, the number of DLA absorbers found with a deep learning algorithm is augmented using metal Mg ii absorbers as signposts. The artificial training data was generated by inserting synthetic absorption lines into spectra. Using previously identified DLAs as a test set, the model returned a 94.6% accuracy score and 1197 new DLA absorbers, which nearly doubles the previously known number of samples within the search catalog. Additionally, the column density and Doppler broadening are measured on the newly found DLA absorbers through Voigt profile fitting.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kinematic Association of Two FU Orionis Stars with Young Clusters in Orion 猎户座两颗猎户座 FU 星与猎户座年轻星团的运动学联系
Research notes of the AAS Pub Date : 2024-06-25 DOI: 10.3847/2515-5172/ad5a9c
Tamojeet Roychowdhury and Lynne A. Hillenbrand
{"title":"Kinematic Association of Two FU Orionis Stars with Young Clusters in Orion","authors":"Tamojeet Roychowdhury and Lynne A. Hillenbrand","doi":"10.3847/2515-5172/ad5a9c","DOIUrl":"https://doi.org/10.3847/2515-5172/ad5a9c","url":null,"abstract":"Many known FU Orionis stars are projected on the sky at the peripheries of star-forming regions. Physical association is assumed, but not yet firmly established. We investigate the cases of two such stars, FU Ori and V883 Ori, seeking kinematic evidence of their membership in young clusters associated with the Orion molecular clouds. Using astrometric data from Gaia DR3, we search for consistent 2D velocities, and we also use more limited radial velocity data to assess 3D velocities. Considering +/ − 25 pc boxes centered on λ Ori and the Orion Nebula Cluster, we use the inferred velocity fields to confirm the kinematic association of FU Ori with the former, and V883 Ori with the latter.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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