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An Analysis of Blue Straggler Stars in Open Clusters 对疏散星团中蓝色流浪星的分析
Research notes of the AAS Pub Date : 2024-07-31 DOI: 10.3847/2515-5172/ad686e
Andrew Harvey, Yuvraj Sahu, Elijah Flores
{"title":"An Analysis of Blue Straggler Stars in Open Clusters","authors":"Andrew Harvey, Yuvraj Sahu, Elijah Flores","doi":"10.3847/2515-5172/ad686e","DOIUrl":"https://doi.org/10.3847/2515-5172/ad686e","url":null,"abstract":"The presence of blue straggler stars (BSSs) in open clusters (OCs) presents an opportunity to study star formation and cluster dynamics. Our paper analyzes several properties of BSSs across 161 OCs of different ages, metallicities, and sizes. Specifically, we examine the impact of cluster age and metallicity on the number of BSSs as well as the spatial distribution of BSSs within each cluster. We report a positive correlation between the age of the cluster and the number of BSSs present. This investigation into BSSs provides valuable insights into their formation as well as the dynamics and interactions within open clusters.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"177 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873286","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
Tail Morphology of Near-Sun Comet C/2020 F3 (NEOWISE) 近太阳彗星 C/2020 F3（NEOWISE）的尾部形态学
Research notes of the AAS Pub Date : 2024-07-30 DOI: 10.3847/2515-5172/ad6860
Yihao Zhou, Quanzhi Ye
{"title":"Tail Morphology of Near-Sun Comet C/2020 F3 (NEOWISE)","authors":"Yihao Zhou, Quanzhi Ye","doi":"10.3847/2515-5172/ad6860","DOIUrl":"https://doi.org/10.3847/2515-5172/ad6860","url":null,"abstract":"We study the morphological changes of bright near-Sun comet C/2020 F3 (NEOWISE) using a series of multi-color wide-field images obtained in 2020 July 8–30, as the comet receded from 0.3 to 0.8 au from the Sun. Syndyne–synchrone modeling shows that the dusts that makes up the visible tail were mostly produced at and after perihelion. The images show changes of dust size distribution throughout the observations, with a gradual depletion of micron-sized particles. We discuss caveats in using the syndyne–synchrone model to study tail dynamics of comets at small perihelion distances. The <italic toggle=\"yes\">r</italic>-band images consistently show a straight, non-dust tail throughout our observations that is likely to be made by neutral sodium atoms and H<sub>2</sub>O<sup>+</sup> molecules.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871310","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
Finding Passive Galaxies in H i-MaNGA: The Impact of Star Formation Rate Indicator 在 H i-MaNGA 中寻找被动星系：恒星形成率指标的影响
Research notes of the AAS Pub Date : 2024-07-29 DOI: 10.3847/2515-5172/ad676f
Nora Salem, Karen L. Masters, David V. Stark, Anubhav Sharma
{"title":"Finding Passive Galaxies in H i-MaNGA: The Impact of Star Formation Rate Indicator","authors":"Nora Salem, Karen L. Masters, David V. Stark, Anubhav Sharma","doi":"10.3847/2515-5172/ad676f","DOIUrl":"https://doi.org/10.3847/2515-5172/ad676f","url":null,"abstract":"H <sc>i</sc>-rich galaxies typically have high star formation rates (SFRs), but there exist interesting H <sc>i</sc>-rich and low star-forming galaxies. Previous work on a sample of these galaxies identified from H <sc>i</sc>-Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) (H <sc>i</sc> follow-up to the MaNGA survey) using an infrared indicator of specific-SFR (sSFR; namely W2 − W3 &lt; 2) could find no single physical process to explain their unusual behavior. The method by which galaxies are identified as low sSFR may be important in this conclusion. In this Research Note, we explore how an H <sc>i</sc>-rich, low sSFR sample of H <sc>i</sc>-MaNGA galaxies differs using H<italic toggle=\"yes\">α</italic>, single stellar population, and ultraviolet estimators of SFR. We find that samples are statistically similar to each other so long as W2 − W3 &lt; 2 is interpreted as corresponding to sSFR &lt; 10<sup>−11.15</sup> yr<sup>−1</sup>.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871311","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
Additional Doppler Monitoring Corroborates HAT-P-11c as a Planet 额外的多普勒监测证实 HAT-P-11c 是一颗行星
Research notes of the AAS Pub Date : 2024-07-25 DOI: 10.3847/2515-5172/ad675e
Samuel W. Yee, Erik A. Petigura, Howard Isaacson, Andrew W. Howard, Sarah Blunt, Paul A. Dalba, Fei Dai, Benjamin J. Fulton, Steven Giacalone, Stephen R. Kane, Molly Kosiarek, Teo Močnik, Malena Rice, Ryan Rubenzahl, Nicholas Saunders, Dakotah Tyler, Lauren M. Weiss and Jingwen Zhang
{"title":"Additional Doppler Monitoring Corroborates HAT-P-11c as a Planet","authors":"Samuel W. Yee, Erik A. Petigura, Howard Isaacson, Andrew W. Howard, Sarah Blunt, Paul A. Dalba, Fei Dai, Benjamin J. Fulton, Steven Giacalone, Stephen R. Kane, Molly Kosiarek, Teo Močnik, Malena Rice, Ryan Rubenzahl, Nicholas Saunders, Dakotah Tyler, Lauren M. Weiss and Jingwen Zhang","doi":"10.3847/2515-5172/ad675e","DOIUrl":"https://doi.org/10.3847/2515-5172/ad675e","url":null,"abstract":"In 2010, Bakos and collaborators discovered a Neptune-sized planet transiting the K-dwarf HAT-P-11 every five days. Later in 2018, Yee and collaborators reported an additional Jovian-mass companion on a nine year orbit based on a decade of Doppler monitoring. The eccentric outer giant HAT-P-11c may be responsible for the peculiar polar orbit of the inner planet HAT-P-11b. However, Basilicata et al. recently suggested that the HAT-P-11c Doppler signal could be caused by stellar activity. In this research note, we extend the Yee et al. Doppler time series by six years. The combined data set spanning 17 yr covers nearly two orbits of the outer planet. Importantly, we observe two periastron passages of planet c and do not observe a coherent activity signature. Together with the previously reported astrometric acceleration of HAT-P-11 from Hipparcos and Gaia, we believe there is strong evidence for HAT-P-11c as a bona fide planet.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771072","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
Radio Recombination Line Observations toward the Fermi Bubble 对费米泡的射电重组线观测
Research notes of the AAS Pub Date : 2024-07-23 DOI: 10.3847/2515-5172/ad6661
Matteo Luisi, Dhanesh Krishnarao, Natalie O. Butterfield, Loren D. Anderson, Pedro Salas, Andrew J. Fox, Felix J. Lockman and Robert A. Benjamin
{"title":"Radio Recombination Line Observations toward the Fermi Bubble","authors":"Matteo Luisi, Dhanesh Krishnarao, Natalie O. Butterfield, Loren D. Anderson, Pedro Salas, Andrew J. Fox, Felix J. Lockman and Robert A. Benjamin","doi":"10.3847/2515-5172/ad6661","DOIUrl":"https://doi.org/10.3847/2515-5172/ad6661","url":null,"abstract":"We use Green Bank Telescope radio recombination line (RRL) observations to constrain the morphology of warm ionized gas in the Fermi Bubble. Our limits on hydrogen RRL emission allow us to constrain the emission measure of the ionized gas and to estimate the beam filling factor of previous Wisconsin H-Alpha Mapper observations. Our results indicate that the warm ionized gas on the Fermi Bubble boundary spans at least 1000 pc2 with a depth of less than a pc, suggesting either a sheet-like structure or a structure consisting of many small clumps. Our data will enable us to properly calibrate future Hα observations and aid in calculating the Lyman continuum flux needed to maintain the ionized gas.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785065","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
OH and H2O Maser Activities Among Long-period Variables 长周期变量中的 OH 和 H2O Maser 活动
Research notes of the AAS Pub Date : 2024-07-23 DOI: 10.3847/2515-5172/ad660d
Tian Wu and Graeme H. Smith
{"title":"OH and H2O Maser Activities Among Long-period Variables","authors":"Tian Wu and Graeme H. Smith","doi":"10.3847/2515-5172/ad660d","DOIUrl":"https://doi.org/10.3847/2515-5172/ad660d","url":null,"abstract":"The distribution within an infrared color–magnitude diagram of variable red giants known to have circumstellar masers is reported. Stars with H2O-maser sources occur within a color and period domain of (J − Ks) > 1.15 and P > 199 days, respectively, often in the absence of OH masers. By contrast, OH masers are mostly detected among cooler red giants with (J − Ks) > 1.35 and P > 316 days, and can coexist with H2O-maser sources. The results suggest that red giants must evolve to absolute magnitudes brighter than prior to enabling H2O-maser emission, and possibly expand beyond a certain size before triggering OH masers.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771073","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
Comet A117uUD Goes Interstellar after Encountering Saturn in 2022 A117uUD 彗星在 2022 年遭遇土星后将进入星际旅行
Research notes of the AAS Pub Date : 2024-07-22 DOI: 10.3847/2515-5172/ad65fc
Carlos de la Fuente Marcos and Raúl de la Fuente Marcos
{"title":"Comet A117uUD Goes Interstellar after Encountering Saturn in 2022","authors":"Carlos de la Fuente Marcos and Raúl de la Fuente Marcos","doi":"10.3847/2515-5172/ad65fc","DOIUrl":"https://doi.org/10.3847/2515-5172/ad65fc","url":null,"abstract":"Small solar system bodies may reach hyperbolic orbits after a close interaction with a giant planet. Comet C/1980 E1 (Bowell), with a current value of the eccentricity of 1.057733 ± 0.000008, reached its present-day path after a close encounter with Jupiter in 1980. Comet A117uUD was found by ATLAS South Africa on 2024 June 14. Its current orbit determination, based on 142 observations for a data-arc span of 31 days, places A117uUD among the bodies following hyperbolic orbits (19.51σ, eccentricity of 1.037 ± 0.002). However, it did not come from interstellar space. Here, we show that it reached its current hyperbolic trajectory after a close encounter with Saturn in 2022.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141754083","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
Assessing the Evolution of Solar Cycle 25: A Weak-moderate Cycle 评估太阳周期 25 的演变：中弱周期
Research notes of the AAS Pub Date : 2024-07-16 DOI: 10.3847/2515-5172/ad62fb
V. M. S. Carrasco, J. M. Vaquero and A. J. P. Aparicio
{"title":"Assessing the Evolution of Solar Cycle 25: A Weak-moderate Cycle","authors":"V. M. S. Carrasco, J. M. Vaquero and A. J. P. Aparicio","doi":"10.3847/2515-5172/ad62fb","DOIUrl":"https://doi.org/10.3847/2515-5172/ad62fb","url":null,"abstract":"This note aims to analyze the evolution of the sunspot number for Solar Cycle 25, updating our previous findings on this topic. We compare daily, monthly and 13 months smoothed sunspot numbers for Solar Cycle 25 with those from previous cycles since mid-18th century (Solar Cycles 1–25). The highest daily, monthly and 13 months smoothed values for Solar Cycle 25 are significantly lower than the mean and median values considering all cycles. In particular, Solar Cycle 25 ranks 17th in terms of the highest 13 months smoothed sunspot number at this point in the cycle. Based on current data and the progression toward its maximum, we conclude that Solar Cycle 25 is likely to be a weak to moderate cycle, consistent with our earlier analyses. In addition, we find that Solar Cycles 13, 14, and 16 have the most similar behavior to that of Solar Cycle 25. Assuming a cycle length for Solar Cycle 25 similar to those of the above cycles, we estimate that the minimum of Solar Cycle 26 will be in 2030–2031.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741379","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
Little Red Dots from Low-spin Galaxies at High Redshifts 高红移下低自旋星系的小红点
Research notes of the AAS Pub Date : 2024-07-11 DOI: 10.3847/2515-5172/ad614c
Abraham Loeb
{"title":"Little Red Dots from Low-spin Galaxies at High Redshifts","authors":"Abraham Loeb","doi":"10.3847/2515-5172/ad614c","DOIUrl":"https://doi.org/10.3847/2515-5172/ad614c","url":null,"abstract":"Recently, a new population of compact, high-redshift (z ≳ 7) galaxies appeared as little red dots (LRDs) in deep JWST observations. The latest spectroscopic data indicates that these galaxies contain an evolved stellar population, reflecting an early episode of high star formation-rate. The appearance of broad emission lines suggests that a central overmassive black hole also powers these galaxies. I propose that LRD galaxies represent the low-spin tail of the galaxy population. Low-spin galaxies host a more compact gaseous disk with an enhanced star formation rate relative to typical galaxies at the same redshift. The compact disk feeds efficiently a central black hole, as predicted by Eisenstein & Loeb.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141615088","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
New Spectroscopic Redshift Places PEARLSDG in a Group at ∼124 Mpc 新的光谱红移将 PEARLSDG 置于 ∼124 Mpc 的星团中
Research notes of the AAS Pub Date : 2024-07-11 DOI: 10.3847/2515-5172/ad61d9
Timothy Carleton, Steven P. Willner, Timothy Ellsworth-Bowers, Rogier A. Windhorst, Seth H. Cohen, Christopher J. Conselice, Jose M. Diego, Adi Zitrin, Haylee N. Archer, Isabel McIntyre, Patrick Kamieneski, Rolf A. Jansen, Jake Summers, Jordan C. J. D’Silva, Anton M. Koekemoer, Dan Coe, Simon P. Driver, Brenda Frye, Norman A. Grogin, Madeline A. Marshall, Mario Nonino, Nor Pirzkal, Aaron Robotham, Russell E. Ryan, Rafael Ortiz, Scott Tompkins, Christopher N. A. Willmer, Haojing Yan and Benne W. Holwerda
{"title":"New Spectroscopic Redshift Places PEARLSDG in a Group at ∼124 Mpc","authors":"Timothy Carleton, Steven P. Willner, Timothy Ellsworth-Bowers, Rogier A. Windhorst, Seth H. Cohen, Christopher J. Conselice, Jose M. Diego, Adi Zitrin, Haylee N. Archer, Isabel McIntyre, Patrick Kamieneski, Rolf A. Jansen, Jake Summers, Jordan C. J. D’Silva, Anton M. Koekemoer, Dan Coe, Simon P. Driver, Brenda Frye, Norman A. Grogin, Madeline A. Marshall, Mario Nonino, Nor Pirzkal, Aaron Robotham, Russell E. Ryan, Rafael Ortiz, Scott Tompkins, Christopher N. A. Willmer, Haojing Yan and Benne W. Holwerda","doi":"10.3847/2515-5172/ad61d9","DOIUrl":"https://doi.org/10.3847/2515-5172/ad61d9","url":null,"abstract":"PEARLSDG was previously reported as an isolated dwarf galaxy with a TRGB distance of 30 Mpc. New data show this to not be the case. We report a new spectroscopic redshift of 0.02809, which argues for an association with a group of galaxies at ∼124 Mpc.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614291","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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