J 2024

The astrophysical parameters of chemically peculiar stars from automatic methods

PAUNZEN, Ernst

Basic information

Original name

The astrophysical parameters of chemically peculiar stars from automatic methods

Authors

PAUNZEN, Ernst (40 Austria, guarantor, belonging to the institution)

Edition

Astronomy and Astrophysics, EDP Sciences, 2024, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 6.500 in 2022

Organization unit

Faculty of Science

UT WoS

001184569900021

Keywords in English

stars: chemically peculiar; stars: fundamental parameters; Hertzsprung-Russell and C-M diagrams

Tags

Tags

International impact, Reviewed
Změněno: 3/5/2024 12:21, Mgr. Marie Šípková, DiS.

Abstract

V originále

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 (T-eff) 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 T-eff 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 T-eff 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 T-eff 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.

Links

GA23-07605S, research and development project
Name: Osud galaktických otevřených hvězdokup
Investor: Czech Science Foundation, The fate of Galactic open clusters