发布求助
文献互助 智能选刊 最新文献

Research notes of the AAS最新文献

筛选
英文 中文
Multi-color Photometry of Near-Earth Asteroid (415029) 2011 UL21 近地小行星 (415029) 2011 UL21 的多色光度测量法
Research notes of the AAS Pub Date : 2024-08-28 DOI: 10.3847/2515-5172/ad7394
Bojan Novaković
{"title":"Multi-color Photometry of Near-Earth Asteroid (415029) 2011 UL21","authors":"Bojan Novaković","doi":"10.3847/2515-5172/ad7394","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7394","url":null,"abstract":"<italic toggle=\"yes\">BVR</italic> photometric series of observations of potentially hazardous asteroid (415029) 2011 UL21 were obtained at the Astronomical Station of Vidojevica around its close approach to the Earth on 2018 July 1. From these observations, the color indices <italic toggle=\"yes\">V</italic> − <italic toggle=\"yes\">R</italic> = 0.48 ± 0.07 and <italic toggle=\"yes\">B</italic> − <italic toggle=\"yes\">V</italic> = 0.89 ± 0.06 were determined, suggesting R- or S-type taxonomic classification of the object. The observed small lightcurve amplitude suggests a nearly spherical shape of the asteroid.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218013","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
Excluding Primordial Black Holes as Dark Matter Based on Solar System Ephemeris 根据太阳系星历排除作为暗物质的原始黑洞
Research notes of the AAS Pub Date : 2024-08-28 DOI: 10.3847/2515-5172/ad739e
Abraham Loeb
{"title":"Excluding Primordial Black Holes as Dark Matter Based on Solar System Ephemeris","authors":"Abraham Loeb","doi":"10.3847/2515-5172/ad739e","DOIUrl":"https://doi.org/10.3847/2515-5172/ad739e","url":null,"abstract":"Current cosmological constraints allow primordial black holes to constitute dark matter in the mass range of 10<sup>18</sup>–10<sup>22</sup> g. I show that a major portion of this logarithmic window can be ruled-out based on the solar system ephemeris, given that the external mass enclosed within 50 au from the Sun did not change by more than ∼5 × 10<sup>−14</sup> <italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> yr<sup>−1</sup> in recent decades.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218022","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
On the Dynamical Erasure of Initial Conditions in Multi-planetary Systems 论多行星系统中初始条件的动态消除
Research notes of the AAS Pub Date : 2024-08-28 DOI: 10.3847/2515-5172/ad7380
Kevin Marimbu, Eve J. Lee
{"title":"On the Dynamical Erasure of Initial Conditions in Multi-planetary Systems","authors":"Kevin Marimbu, Eve J. Lee","doi":"10.3847/2515-5172/ad7380","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7380","url":null,"abstract":"Do sub-Neptunes assemble close to where we see them or do they form full-fledged farther away from their host star then migrate inwards? We explore this question using the distribution of measured orbital periods, one of the most fundamental observable parameters. Under disk-induced migration, planet occurrence rate is expected to decrease toward shorter orbital periods. Presently, the observed sub-Neptune period distribution is flat in log period, between 10 and 300 days. We show, using <italic toggle=\"yes\">N</italic>-body integration, how post-disk dynamical instabilities and mergers in multi-planetary systems erase the initial conditions of migration emplaced in period distributions over 10 s to 100 Myr timescale, in rough agreement with an observational hint of the abundance of resonant pairs for systems younger than 100 Myr which drops dramatically for more evolved systems. We comment on caveats and future work.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"308 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218011","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
Sizes and Stellar Masses of the Little Red Dots Imply Immense Stellar Densities 小红点的大小和恒星质量意味着恒星密度巨大
Research notes of the AAS Pub Date : 2024-08-28 DOI: 10.3847/2515-5172/ad7262
Carl Audric Guia, Fabio Pacucci, Dale D. Kocevski
{"title":"Sizes and Stellar Masses of the Little Red Dots Imply Immense Stellar Densities","authors":"Carl Audric Guia, Fabio Pacucci, Dale D. Kocevski","doi":"10.3847/2515-5172/ad7262","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7262","url":null,"abstract":"The “Little Red Dots” (LRDs) are red and compact galaxies detected in JWST deep fields, mainly in the redshift range <italic toggle=\"yes\">z</italic> = 4–8. Given their compactness and the inferred stellar masses in the hypothesis that LRDs are starburst galaxies, the implied stellar densities are immense. This Research Note uses an extensive catalog of LRDs from the PRIMER and the COSMOS-Web surveys to investigate these densities. We find a median (upper limit) on the effective radius of 80 pc, which leads to median (lower limit) values of the core density of ∼10<sup>4</sup> <italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> pc<sup>−3</sup>, and individual densities as high as ∼10<sup>8</sup> <italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> pc<sup>−3</sup>, which is ∼10 times higher than the density necessary for runaway collisions to take place. For ∼35% of the LRDs investigated, the lower limits are higher than the highest stellar densities observed in any system in any redshift range.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227093","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
A Comment on the Solar Activity Level in 1744 by Diego de Torres Villarroel 迭戈-德-托雷斯-比利亚罗埃尔对 1744 年太阳活动水平的评论
Research notes of the AAS Pub Date : 2024-08-22 DOI: 10.3847/2515-5172/ad71c2
A. J. P. Aparicio, J. M. Vaquero
{"title":"A Comment on the Solar Activity Level in 1744 by Diego de Torres Villarroel","authors":"A. J. P. Aparicio, J. M. Vaquero","doi":"10.3847/2515-5172/ad71c2","DOIUrl":"https://doi.org/10.3847/2515-5172/ad71c2","url":null,"abstract":"Solar activity in recent centuries is crucial for astrophysics and geophysics, with historical sunspot records providing key insights, particularly for the 17th and 18th centuries. However, certain periods, such as around 1744, are still poorly understood. This note explores a qualitative commentary on solar activity from that time by Diego de Torres Villarroel, a notable Spanish writer. In his pamphlet on the great comet of 1744, Villarroel observed that the Sun appeared unusually clear, with fewer sunspots and faculae than usual, indicating low solar activity. These observations are consistent with the known solar minimum between cycles −1 and 0 around 1744. While Villarroel’s remarks only offer qualitative confirmation of existing knowledge, they are important for filling in gaps in historical records of solar activity and should be preserved for future research.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218018","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. V. HD 174933 (112 Her) 通过 B 型晚期恒星中位于 5677.10 Å 处的 Hg ii 线确定水星丰度。V. HD 174933 (112 Her)
Research notes of the AAS Pub Date : 2024-08-22 DOI: 10.3847/2515-5172/ad7113
Richard Monier
{"title":"Determination of the Abundance of Mercury from the Hg ii Line at 5677.10 Å in Late B-type Stars. V. HD 174933 (112 Her)","authors":"Richard Monier","doi":"10.3847/2515-5172/ad7113","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7113","url":null,"abstract":"The weak line of Hg <sc>ii</sc> located at 5677.10 Å is used to measure the mercury abundance in the HgMn star HD 174933 (112 Her). This line is detected at 3<italic toggle=\"yes\">σ</italic> above the noise in the adjacent continuum. The synthesis of this line, confirms a large overabundance of mercury, about +4.54 dex, which is less than the excess derived from the 3983.93 Å line in earlier studies. The synthesis of lines in five spectral regions yields estimates of the abundance deficienciess/excesses for twelve other elements. Helium, carbon and magnesium are very depleted, titanium, manganese and iron are moderately overabundant. Strontium, yttrium, zirconium and barium have solar abundances upper limits. Phosphorus, gallium and mercury are very overabundant. The abundance pattern of 112 Her differs from that of other HgMn stars as already stressed in previous studies.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"185 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227092","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
Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43M ⊙, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae* * Based on observations collected at the European Southern Observatory, Chile, Program ID 111.24UP.001. 中质量恒星的隐藏伴星。XXII.推断三星系 Lambda Muscae 中的天体测量双星中有一颗 0.43M ⊙, 1.65 au 伴星* * 基于智利欧洲南方天文台的观测数据，计划编号 111.24UP.001。
Research notes of the AAS Pub Date : 2024-08-22 DOI: 10.3847/2515-5172/ad713a
Idel Waisberg, Ygal Klein, Boaz Katz
{"title":"Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43M ⊙, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae* * Based on observations collected at the European Southern Observatory, Chile, Program ID 111.24UP.001.","authors":"Idel Waisberg, Ygal Klein, Boaz Katz","doi":"10.3847/2515-5172/ad713a","DOIUrl":"https://doi.org/10.3847/2515-5172/ad713a","url":null,"abstract":"Lambda Muscae is a nearby A-type star reported as a <italic toggle=\"yes\">P</italic> = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16<italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE. Based on a <italic toggle=\"yes\">K</italic> band flux ratio upper limit of 1% from a VLTI/GRAVITY interferometric observation, we estimate a primary mass <italic toggle=\"yes\">M</italic>\u0000<sub>\u0000<italic toggle=\"yes\">Aa</italic>\u0000</sub> = 2.28<italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> and infer that the closer companion is a <italic toggle=\"yes\">M</italic>\u0000<sub>\u0000<italic toggle=\"yes\">Ab</italic>\u0000</sub> = 0.43<italic toggle=\"yes\">M</italic>\u0000<sub>⊙</sub> star (almost certainly an M dwarf) orbiting at <italic toggle=\"yes\">a</italic> = 1.65 au. The triple system might be dynamically interesting given the low hierarchy and the ratio of angular momenta of the inner and outer orbits of about one.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"299 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218016","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
A Candidate Dark Matter Deficient Dwarf Galaxy in the Fornax Cluster Identified through Overluminous Star Clusters 通过过度发光星团发现的福纳克斯星团中一个暗物质缺乏的矮星系候选者
Research notes of the AAS Pub Date : 2024-08-22 DOI: 10.3847/2515-5172/ad7112
Aaron J. Romanowsky, Enrique Cabrera, Steven R. Janssens
{"title":"A Candidate Dark Matter Deficient Dwarf Galaxy in the Fornax Cluster Identified through Overluminous Star Clusters","authors":"Aaron J. Romanowsky, Enrique Cabrera, Steven R. Janssens","doi":"10.3847/2515-5172/ad7112","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7112","url":null,"abstract":"Two low surface brightness (LSB) dwarf galaxies were identified recently as having little or no dark matter (DM), provoking widespread interest in their formation histories. These galaxies also host populous systems of star clusters that are on average larger and more luminous than typical globular clusters (GCs). We report an initial attempt to identify new candidate DM-deficient dwarfs via their unusual GC systems. Using a large catalog of LSB galaxies from the Dark Energy Survey, we inspect their Dark Energy Camera Legacy Survey (DECaLS) imaging and identify FCC 224 as a candidate found on the outskirts of the Fornax cluster. We analyze the GC system using DECaLS and archival Hubble Space Telescope WFPC2 imaging, and find an apparent population of overluminous GCs. More detailed follow-up of FCC 224 is in progress.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"75 9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218017","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
A Rare Cepheid-hosting Open Cluster Triad in Sagittarius 射手座罕见的仙王座寄生疏散星团三联体
Research notes of the AAS Pub Date : 2024-08-22 DOI: 10.3847/2515-5172/ad7139
Daniel Majaess, David G. Turner, Igor Usenko
{"title":"A Rare Cepheid-hosting Open Cluster Triad in Sagittarius","authors":"Daniel Majaess, David G. Turner, Igor Usenko","doi":"10.3847/2515-5172/ad7139","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7139","url":null,"abstract":"The following Galactic star clusters may constitute a rare Cepheid hosting triad in Sagittarius: M25, NGC 6716, and Collinder 394. The open clusters have comparable ages (<italic toggle=\"yes\">τ</italic> ≃ 80 Myr) and nearly aligned main-sequences and turnoffs after accounting for differential extinction (<italic toggle=\"yes\">A</italic>\u0000<sub>\u0000<italic toggle=\"yes\">G</italic>\u0000</sub>, <inline-formula>\u0000<tex-math>\u0000<?CDATA ${E}_{{B}_{P}-{R}_{P}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>P</mml:mi></mml:mrow></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mrow><mml:mi>R</mml:mi></mml:mrow><mml:mrow><mml:mi>P</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msub></mml:math>\u0000<inline-graphic xlink:href=\"rnaasad7139ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>). Gaia DR3 astrometry confirms an association between the three clusters, and importantly, the classical Cepheid U Sgr is a member (<italic toggle=\"yes\">P</italic> ≃ 6.ͩ75, <italic toggle=\"yes\">τ</italic> ≃ 80 Myr), while DR3 data indicate that the classical Cepheid BB Sgr (<italic toggle=\"yes\">P</italic> ≃ 6.ͩ64, <italic toggle=\"yes\">τ</italic> ≃ 80 Myr) could possibly be an escaped member traversing the background field.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218015","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
Identifying Uncertainties in Stellar Evolution Models Using the Open Cluster M67 利用疏散星团 M67 识别恒星演化模型中的不确定性
Research notes of the AAS Pub Date : 2024-08-21 DOI: 10.3847/2515-5172/ad7093
Susan Byrom, Jamie Tayar
{"title":"Identifying Uncertainties in Stellar Evolution Models Using the Open Cluster M67","authors":"Susan Byrom, Jamie Tayar","doi":"10.3847/2515-5172/ad7093","DOIUrl":"https://doi.org/10.3847/2515-5172/ad7093","url":null,"abstract":"Stellar age estimates are often calculated by interpolating a star’s properties in a grid of models. However, different model grids will give different ages for the same star. We used the open cluster M67 to compare four different model grids: DSEP, GARSTEC, MIST, and YREC (<named-content content-type=\"dataset\" xlink:href=\"https://doi.org/10.5281/zenodo.12775242\" xlink:type=\"simple\">10.5281/zenodo.12775242</named-content>). Across <!--AQ1-->all model grids, age estimates for main sequence stars were consistently higher than the accepted age of M67, while age estimates for red giant stars were lower. We compared model-generated age and mass values to external constraints as an additional test of the reliability of each model grid. For stars near solar age and metallicity, we recommend using the DSEP model grid to estimate the ages of main sequence stars and the GARSTEC model grid for red giant stars.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218019","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信