New catalogue of Chemically Peculiar stars, and Statistical Analysis

TL;DR

This paper introduces a comprehensive catalogue of 428 Chemically Peculiar stars, analyzing their abundance anomalies and correlations with stellar parameters through statistical methods, revealing significant relationships and specific case studies.

Contribution

The paper provides the first extensive catalogue of CP stars with spectroscopic data and conducts a detailed statistical analysis of abundance anomalies versus stellar parameters.

Findings

Significant correlations between abundance peculiarities and temperature, gravity, and rotation.

Detailed case studies on Mn in HgMn stars, Ca in AmFm stars, and He and Fe in ApBp stars.

No correlation found between multiplicity and abundance peculiarities in ApBp stars.

Abstract

In this paper we present a new catalogue of Chemically Peculiar (CP) stars obtained by compiling publications in which abundances of metals are provided. Our catalogue includes 428 stars for which the data were obtained through spectroscopic observations. Most of them (416) are AmFm, HgMn and ApBp stars. We have used this compilation to proceed to a statistical overview of the abundance anomalies versus the physical parameters of the stars. The Spearman's rank correlation test has been applied, and a significant number of correlations of abundance peculiarities with respect to effective temperature, surface gravity and rotation velocity have been found. Four interesting cases are discussed in details: the Mn peculiarities in HgMn stars, the Ca correlation with respect to effective temperature in AmFm stars, the case of helium and iron in ApBp stars. Furthermore, we checked for ApBp stars using Anderson-Darling test wether the belonging to a multiple system is a determinant parameter or not for abundance peculiarities.