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The astrophysical parameters of chemically peculiar stars from automatic methods
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-03-13 , DOI: 10.1051/0004-6361/202348086
E. Paunzen

Context. The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories for investigating the diffusion, mass loss, rotational mixing, and pulsation in the presence and absence of a stable local magnetic field. For this, we need a homogeneous set of parameters, such as effective temperature (Teff) and surface gravity (log g), to locate the stars in the Hertzsprung-Russell diagram so that we can then estimate the mass, radius, and age.Aims. In recent years, the results of several automatic pipelines have been published; these use various techniques and data sets, including Teff and log g values for millions of stars. Because CP stars are known to have flux anomalies, these astrophysical parameters must be tested for their reliability and usefulness. If the outcome is positive, these can be used to analyse the new and faint CP stars published recently.Methods. I compared published Teff and log g values of a set of CP stars, which are mostly based on high-resolution spectroscopy, with values from four automatic pipeline approaches. In doing so, I searched for possible correlations and offsets.Results. I present a detailed statistical analysis of a comparison between the ‘standard’ and published Teff and log g values. The accuracy depends on the presence of a magnetic field and the spectral type of the CP subgroups. However, I obtain standard deviations of between 2% and 20%.Conclusions. Considering the statistical errors, the astrophysical parameters from the literature can be used for CP stars, although caution is advised for magnetic CP stars.

中文翻译:

通过自动方法获得化学奇特恒星的天体物理参数

语境。上部主序带的化学奇特(CP)恒星是优秀的天体物理实验室,用于研究存在和不存在稳定局部磁场的情况下的扩散、质量损失、旋转混合和脉动。为此,我们需要一组均匀的参数,例如有效温度 ( T eff ) 和表面重力 (log g ),以在赫罗图中定位恒星,以便我们可以估计质量、半径和年龄。目标。近年来,多项自动流水线成果相继发表;这些使用各种技术和数据集,包括数百万颗恒星的T eff和 log g值。由于已知 CP 星具有通量异常,因此必须测试这些天体物理参数的可靠性和有用性。如果结果是积极的,这些可以用来分析最近发布的新的和微弱的CP星。方法。我将已发表的一组 CP 星的T eff和 log g值(主要基于高分辨率光谱)与四种自动管道方法的值进行了比较。在此过程中,我寻找了可能的相关性和抵消。结果。我对“标准”与已发布的T eff和 log g值之间的比较进行了详细的统计分析。精度取决于磁场的存在和 CP 子组的光谱类型。然而,我得到的标准偏差在 2% 到 20% 之间。结论。考虑到统计误差,文献中的天体物理参数可用于 CP 星,但建议谨慎对待磁 CP 星。
更新日期:2024-03-13
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