The astrophysical parameters of chemically peculiar stars from
automatic methods

J 2024

The astrophysical parameters of chemically peculiar stars from automatic methods

PAUNZEN, Ernst

Základní údaje

Originální název

The astrophysical parameters of chemically peculiar stars from automatic methods

Autoři

PAUNZEN, Ernst (40 Rakousko, garant, domácí)

Vydání

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

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL arXiv

Impakt faktor

Impact factor: 6.500 v roce 2022

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/202348086

UT WoS

001184569900021

Klíčová slova anglicky

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

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 3. 5. 2024 12:21, Mgr. Marie Šípková, DiS.

Anotace

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.

Návaznosti

GA23-07605S, projekt VaV

Název: Osud galaktických otevřených hvězdokup

Investor: Grantová agentura ČR, Osud galaktických otevřených hvězdokup

Citovat

PAUNZEN, Ernst. The astrophysical parameters of chemically peculiar stars from automatic methods. Astronomy and Astrophysics. EDP Sciences, 2024, roč. 683, March 2024, s. 1-4. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202348086.

@article{2398817,
   author = {Paunzen, Ernst},
   article_number = {March 2024},
   doi = {http://dx.doi.org/10.1051/0004-6361/202348086},
   keywords = {stars: chemically peculiar; stars: fundamental parameters; Hertzsprung-Russell and C-M diagrams},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {The astrophysical parameters of chemically peculiar stars from automatic methods},
   url = {https://www.aanda.org/articles/aa/full_html/2024/03/aa48086-23/aa48086-23.html},
   volume = {683},
   year = {2024}
}

TY  - JOUR
ID  - 2398817
AU  - Paunzen, Ernst
PY  - 2024
TI  - The astrophysical parameters of chemically peculiar stars from automatic methods
JF  - Astronomy and Astrophysics
VL  - 683
IS  - March 2024
SP  - 1-4
EP  - 1-4
PB  - EDP Sciences
SN  - 00046361
KW  - stars: chemically peculiar
KW  - stars: fundamental parameters
KW  - Hertzsprung-Russell and C-M diagrams
UR  - https://www.aanda.org/articles/aa/full_html/2024/03/aa48086-23/aa48086-23.html
N2  - 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.
ER  -

PAUNZEN, Ernst. The astrophysical parameters of chemically peculiar stars from automatic methods. \textit{Astronomy and Astrophysics}. EDP Sciences, 2024, roč.~683, March 2024, s.~1-4. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202348086.

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