标题： ATLAS变星第一星表中的新磁性化学异常恒星和候选体 显示英文标题

标题： New magnetic chemically peculiar stars and candidates in the ATLAS First Catalog of Variable Stars

摘要： 在过去十年中，已知的变星数量增加了几个数量级，自动化分类程序在应对这一发展方面变得越来越重要。 在这里，我们表明，Heinze等人（2018）在ATLAS变星第一目录中提出的一种潜在的新变星类别——“倒置CBH变星”——至少在很大程度上是由alpha2 Canum Venaticorum（ACV）变星组成的，即光度变化的磁化学异常（CP2/He-异常）恒星，具有明显的双波光变曲线。 使用合适的筛选标准，我们在ATLAS变星目录中识别出264个ACV变星候选者。其中62个天体通过大视场多目标光纤光谱望远镜（LAMOST）的光谱进行了光谱确认（除9颗恒星外均为新发现），并按照MK系统进行了分类。其余202颗恒星在此作为需要光谱确认的ACV恒星候选者提出。 我们的样本中的大多数恒星是主序星。推导出的质量范围从1.4M(Sun)到5M(Sun)，我们样本中有一半的恒星位于2 M(Sun)到2.4 M(Sun)的范围内，这与光谱分类结果一致。 大多数恒星属于薄盘或厚盘；然而，有四个天体被归类为晕星群体的成员。 在此提出的恒星在14等左右达到峰值亮度分布，位于已知银河系mCP恒星群体的暗端。 我们的研究强调了在自动化分类程序中考虑罕见的变异性类别，如ACV变星的必要性。 显示英文摘要

摘要： The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with this development. Here we show that the "upside-down CBH variables", which were proposed as a potentially new class of variable stars by Heinze et al. (2018) in the ATLAS First Catalogue of Variable Stars, are, at least to a high percentage, made up of alpha2 Canum Venaticorum (ACV) variables - that is, photometrically variable magnetic chemically peculiar (CP2/He-peculiar) stars - with distinct double-wave light curves. Using suitable selection criteria, we identified 264 candidate ACV variables in the ATLAS variable star catalogue. 62 of these objects were spectroscopically confirmed with spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (all new discoveries except for nine stars) and classified on the MK system. The other 202 stars are here presented as ACV star candidates that require spectroscopic confirmation. The vast majority of our sample of stars are main-sequence objects. Derived masses range from 1.4M(Sun) to 5M(Sun), with half our sample stars being situated in the range from 2 M(Sun) to 2.4 M(Sun), in good agreement with the spectral classifications. Most stars belong to the thin or thick disk; four objects, however, classify as members of the halo population. With a peak magnitude distribution at around 14th magnitude, the here presented stars are situated at the faint end of the known Galactic mCP star population. Our study highlights the need to consider rare variability classes, like ACV variables, in automated classification routines.