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KUESS, Lukas, Ernst PAUNZEN, Nikola FALTOVÁ, Daniel JADLOVSKÝ, Matúš LABAJ, Marko MESARČ, Prapti MONDAL, Michal PRIŠEGEN, Tahereh RAMEZANI, Johana SUPÍKOVÁ, Kateřina SVAČINKOVÁ, Michaela VÍTKOVÁ, Caiyun XIA, Klaus BERNHARD and Stefan HÜMMERICH. Chemically peculiar stars on the pre-main sequence. Astronomy & Astrophysics. EDP Sciences, 2024, 25 pp. ISSN 0004-6361.

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TY  - JOUR
ID  - 2412817
AU  - Kueß, Lukas - Paunzen, Ernst - Faltová, Nikola - Jadlovský, Daniel - Labaj, Matúš - Mesarč, Marko - Mondal, Prapti - Prišegen, Michal - Ramezani, Tahereh - Supíková, Johana - Svačinková, Kateřina - Vítková, Michaela - Xia, Caiyun - Bernhard, Klaus - Hümmerich, Stefan
PY  - 2024
TI  - Chemically peculiar stars on the pre-main sequence
JF  - Astronomy & Astrophysics
PB  - EDP Sciences
SN  - 00046361
KW  - Stars: chemically peculiar
KW  - Stars: pre-main sequence
KW  - Stars: variables: general
KW  - open clusters and associations: general
KW  - Hertzsprung-Russell and C-M diagrams
UR  - https://ui.adsabs.harvard.edu/abs/2024arXiv240508946K/abstract
N2  - Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects is still a mystery and contains many open questions. Aims. We identify CP stars on the pre-main sequence to determine possible mechanisms that lead to the occurrence of chemical peculiarities in the (very) early stages of stellar evolution. Methods. We identified likely pre-main-sequence stars by fitting the spectral energy distributions. The subsequent analysis using stellar spectra and photometric time series helped us to distinguish between CP and non-CP stars. Additionally, we compared our results to the literature to provide the best possible quality assessment. Results. Out of 45 candidates, about 70 % seem to be true CP stars or CP candidates. Furthermore, 9 sources appear to be CP stars on the pre-main sequence, and all are magnetic. We finally report a possible CP2 star that is also a pre-main-sequence star and was not previously in the literature. Conclusions. The evolution of the peculiarities seems to be related to the (strong) magnetic fields in these CP2 stars.
ER  -

Basic information
Original name	Chemically peculiar stars on the pre-main sequence
Authors	KUESS, Lukas, Ernst PAUNZEN, Nikola FALTOVÁ, Daniel JADLOVSKÝ, Matúš LABAJ, Marko MESARČ, Prapti MONDAL, Michal PRIŠEGEN, Tahereh RAMEZANI, Johana SUPÍKOVÁ, Kateřina SVAČINKOVÁ, Michaela VÍTKOVÁ, Caiyun XIA, Klaus BERNHARD and Stefan HÜMMERICH.
Edition	Astronomy & Astrophysics, EDP Sciences, 2024, 0004-6361.

Other information
Original language	English
Type of outcome	Article in a journal
Field of Study	10308 Astronomy
Country of publisher	France
Confidentiality degree	is not subject to a state or trade secret
WWW	URL
Impact factor	Impact factor: 6.500 in 2022
Organization unit	Faculty of Science
Keywords in English	Stars: chemically peculiar; Stars: pre-main sequence; Stars: variables: general; open clusters and associations: general; Hertzsprung-Russell and C-M diagrams
Tags	International impact, Reviewed
Changed by	Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 21/6/2024 09:20.

Abstract
Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects is still a mystery and contains many open questions. Aims. We identify CP stars on the pre-main sequence to determine possible mechanisms that lead to the occurrence of chemical peculiarities in the (very) early stages of stellar evolution. Methods. We identified likely pre-main-sequence stars by fitting the spectral energy distributions. The subsequent analysis using stellar spectra and photometric time series helped us to distinguish between CP and non-CP stars. Additionally, we compared our results to the literature to provide the best possible quality assessment. Results. Out of 45 candidates, about 70 % seem to be true CP stars or CP candidates. Furthermore, 9 sources appear to be CP stars on the pre-main sequence, and all are magnetic. We finally report a possible CP2 star that is also a pre-main-sequence star and was not previously in the literature. Conclusions. The evolution of the peculiarities seems to be related to the (strong) magnetic fields in these CP2 stars.

Abstract

Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects is still a mystery and contains many open questions. Aims. We identify CP stars on the pre-main sequence to determine possible mechanisms that lead to the occurrence of chemical peculiarities in the (very) early stages of stellar evolution. Methods. We identified likely pre-main-sequence stars by fitting the spectral energy distributions. The subsequent analysis using stellar spectra and photometric time series helped us to distinguish between CP and non-CP stars. Additionally, we compared our results to the literature to provide the best possible quality assessment. Results. Out of 45 candidates, about 70 % seem to be true CP stars or CP candidates. Furthermore, 9 sources appear to be CP stars on the pre-main sequence, and all are magnetic. We finally report a possible CP2 star that is also a pre-main-sequence star and was not previously in the literature. Conclusions. The evolution of the peculiarities seems to be related to the (strong) magnetic fields in these CP2 stars.