论文标题
Gaia DR 2数据和八个高速速度热速度候选人的进化状态
Gaia DR 2 data and the evolutionary status of eight high velocity hot post-AGB candidates
论文作者
论文摘要
来自Gaia Dr 2的八个高速速度热后候选者LS 3593，LSE 148，LS 5107，HD 172324，HD 214539，LS IV -12 111，LS III III +52 24和LS 3099，我们建立了六个可以使他们的视觉符号（derive）（derive）（可能是），光度（log l/l_sun）。除LS 5107以外，所有剩下的七颗恒星在文献中具有准确的有效温度（T_EFF）。其中一些恒星是金属贫困的，其中一些恒星没有壳防尘壳。过去，估计某些恒星的距离为6 〜kpc，我们发现它是不正确的。准确的Gaia DR2视差表明它们在附近的AGB恒星附近。与后AGB进化轨道相比，我们发现它们的初始质量在1M_SUN至2M_SUN的范围内。我们发现LSE 148的光度明显低于后AGB恒星的光度，这表明这是后度后分支恒星或后 - AGB恒星。 LS 3593和LS 5107是Gaia DR2的新高速热速度后星星。
From Gaia DR 2 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 (M_V) and luminosity (log L/L_sun). Except LS 5107 all the remaining seven stars have 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 it 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 in the range of 1M_sun to 2M_sun. 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.
