标题： CP星：使用依巴谷数据的光度校准 显示英文标题

标题： CP stars: Photometric calibrations of luminosity using Hipparcos data

摘要： 在新的Hipparcos数据背景下，重新审视了Stromgren光度校准方法在不同类型CP星上的应用。 首次尝试使用LM统计视差方法（Luri等人，1996年）——基于最大似然原理——来获得绝对星等作为两个Stromgren色指数的函数，从而反映有效温度和演化状态。 将其应用于硅星样本和同一光谱范围内的正常主序星样本，使我们能够比较所获得的校准结果，并讨论硅星在HR图中的位置。 此外，使用一个真实的、光谱选择的Am星样本以及正常主序星，推导出晚型A型主序星的新的绝对星等校准，考虑了演化、金属量和恒星自转的影响。 显示英文摘要

摘要： The application of the Stromgren photometric luminosity calibrations to different types of CP stars is reexamined in the light of the new Hipparcos data. A first attempt is made to use the LM statistical parallax method (Luri et al., 1996) -- based on the maximum likelihood principle -- to obtain a calibration of the absolute magnitude as a function of two Stromgren colour indices, thus reflecting effective temperature and evolution. Its application to a sample of Si stars and to a sample of normal main sequence stars in the same spectral range allows us to compare the calibrations obtained and to discuss the position of Si stars in the HR diagram. Additionally, a sample of bonafide, spectroscopically selected Am stars together with normal main sequence stars are used to derive a new absolute magnitude calibration for late A-type main sequence stars, taking into account the effects of evolution, metallicity and stellar rotation.