论文标题
来自ASAS-3，KELT和睫毛膏数据的新的和改善的磁性CP恒星旋转周期
New and improved rotational periods of magnetic CP stars from ASAS-3, KELT and MASCARA data
论文作者
论文摘要
磁性化学奇特（MCP）恒星允许研究原子扩散，磁场和恒星旋转等多种现象。本研究的目的是通过以准确确定的旋转周期增加对象样品来增强我们对MCP恒星旋转特性的了解。为此，采用了来自ASAS-3，KELT和睫毛膏调查的档案光学时间序列数据，以改善现有的旋转周期信息，并得出迄今尚不称为光度变量的MCP恒星的旋转周期。我们的最终样本由294颗MCP恒星组成，其中首次作为光度变量出现了相当多的（超过40％）。此外，我们确定了与旋转调制相一致但缺乏光谱确认的24个MCP星候选者。我们样本的旋转时期分布与文献非常吻合。大多数恒星在100myr和1gyr旧之间，显然缺乏非常年轻的恒星。在零年龄主序列上没有发现对象。尽管在第一次挖掘之前，但几个明星似乎已经演变为次巨人舞台。我们确定了四个黯然失色的二进制文件（HD 244391，HD 247441，HD 248784和HD 252519），它们可能会托管MCP星。这引起了极大的兴趣，因为MCP恒星很少在近距离二进制系统中，尤其是黯然失色的系统中发现。使用档案光谱，我们发现了有力的证据表明HD 252519系统确实具有MCP星级组件。
Magnetic chemically peculiar (mCP) stars allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields and stellar rotation. The aim of the present investigation is to enhance our knowledge of the rotational properties of mCP stars by increasing the sample of objects with accurately determined rotational periods. To this end, archival photometric time-series data from the ASAS-3, KELT and MASCARA surveys were employed to improve existing rotational period information and derive rotational periods for mCP stars hitherto not known to be photometric variables. Our final sample consists of 294 mCP stars, a considerable amount of which (more than 40%) are presented here as photometric variables for the first time. In addition, we identified 24 mCP star candidates that show light variability in agreement with rotational modulation but lack spectroscopic confirmation. The rotational period distribution of our sample agrees well with the literature.Most stars are between 100Myr and 1Gyr old, with an apparent lack of very young stars. No objects were found on the zero age main sequence; several stars seem to have evolved to the subgiant stage, albeit well before the first dredge-up. We identified four eclipsing binaries (HD 244391, HD 247441, HD 248784 and HD 252519), which potentially host an mCP star. This is of great interest because mCP stars are very rarely found in close binary systems, particularly eclipsing ones. Using archival spectra, we find strong evidence that the HD 252519 system indeed harbours an mCP star component.
