| Heiles星光偏振源表的距离更正 |
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| 引用本文： | 蒙美娘,孙晓辉.Heiles星光偏振源表的距离更正[J].天文学报,2021,62(1):3-36. |
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| 作者姓名： | 蒙美娘 孙晓辉 |
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| 作者单位： | 云南大学物理与天文学院 昆明 650500 |
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| 基金项目： | 国家自然科学基金项目(11763008)资助 |
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| 摘 要： | 星光偏振是研究星际介质磁场的有力工具之一.Heiles源表收集了9286颗恒星的偏振信息,是目前最大的光学波段星光偏振源表,被广泛使用.但该表中恒星的距离参数是以前的测光距离,很不确定.把Heiles源表和Gaia第2次数据释放(DR2)源表进行交叉证认,以位置和星等作为判据,匹配了7613颗恒星,并获得了这些恒星的三角视差距离和误差,超过90%的恒星距离相对误差小于20%.基于新的距离,展示了星光偏振在银河系内的分布并讨论了可能的应用.
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| 关 键 词： | 星表 星际介质:磁场 恒星:距离 天体测量 视差 |
| 收稿时间： | 2020/6/3 0:00:00 |
A Revisit to the Optical Starlight Polarization Catalogue by Heiles: Distance Update |
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| MENG Mei-niang,SUN Xiao-hui.A Revisit to the Optical Starlight Polarization Catalogue by Heiles: Distance Update[J].Acta Astronomica Sinica,2021,62(1):3-36. |
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| Authors: | MENG Mei-niang SUN Xiao-hui |
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| Institution: | School of Physics and Astronomy, Yunnan University, Kunming 650500 |
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| Abstract: | Starlight polarization serves one of the powerful tools to study magnetic fields in the Galactic interstellar medium. Heiles catalogue contains polarization information for 9286 stars and is by far the biggest. This catalogue has been extensively used to study magnetic fields. However, the distance parameters of the stars in this catalogue are from photometric observations and very uncertain. We cross match Heiles catalogue with Gaia Data Release 2 (DR2), and identify 7613 stars using both angular separation and magnitude as constraints. We then obtain precise distances from Gaia DR2 for these stars. For more than 90% of the stars, the relative errors of the new distances are within 20%. Based on the new catalogue, we demonstrate how starlight polarization can probe Galactic magnetic fields. |
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| Keywords: | catalogues ISM (interstellar medium): magnetic field stars: distances astrometry parallaxes |
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