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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Gaia DR2 data and the evolutionary status of eight high-velocity hot post-AGB candidates
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Gaia DR2 data and the evolutionary status of eight high-velocity hot post-AGB candidates

机译：盖亚DR2数据和八个高速热后AGB候选的进化状态

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摘要

From Gaia DR2 data of eight high-velocity hot post-AGB candidates, LS 3593, LSE 148, LS 5107, HD 172324, HD 214539, LS IV-12 111, LS III + 52 24, and LS 3099, we found that six of them have accurate parallaxes which made it possible to derive their distances, absolute visual magnitudes (MV) and luminosity (log L/L-circle dot). All the stars except LS 5107 have an accurate effective temperature (T-eff) in the literature. Some of these stars are metal poor, and some of them do not have circumstellar dust shells. In the past, the distances of some stars were estimated to be 6 kpc, which we find to be incorrect. The accurate Gaia DR2 parallaxes show that they are relatively nearby, post-AGB stars. When compared with post-AGB evolutionary tracks we find their initial masses to be in the range 1M(circle dot) to 2M(circle dot). We find the luminosity of LSE 148 to be significantly lower than that of post-AGB stars, suggesting that this is a post-horizontal-branch star or post-early-AGB star. LS 3593 and LS 5107 are new high-velocity hot post-AGB stars from Gaia DR2.
机译：从八个高速热柱AGB候选者（LS 3593、LSE 148、LS 5107、HD 172324、HD 214539、LS IV-12 111、LS III+52 24和LS 3099）的Gaia DR2数据中，我们发现其中六个具有精确的视差，这使得我们能够得出它们的距离、绝对视震级（MV）和亮度（对数L/L圆点）。在文献中，除LS5107外，所有恒星都有精确的有效温度（T-eff）。这些恒星中有些缺乏金属，有些没有星周尘埃壳。在过去，一些恒星的距离估计为6 kpc，我们发现这是不正确的。精确的盖亚DR2视差显示它们相对较近，是AGB后的恒星。与AGB后的进化轨迹相比，我们发现它们的初始质量在1米（圆点）到2米（圆点）之间。我们发现LSE 148的光度明显低于AGB后恒星的光度，表明这是一颗水平分支后恒星或AGB后早期恒星。LS 3593和LS 5107是来自Gaia DR2的新型高速热后AGB恒星。

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