Chemically peculiar stars on the pre-main sequence

被引：1

作者：

Kuess, L. ^{[1
]}

Paunzen, E. ^{[2
]}

Faltova, N. ^{[2
]}

Jadlovsky, D. ^{[2
]}

Labaj, M. ^{[2
]}

Mesarc, M. ^{[2
]}

Mondal, P. ^{[2
]}

Prisegen, M. ^{[3
]}

Ramezani, T. ^{[2
]}

Supikova, J. ^{[2
,4
]}

Svacinkova, K. ^{[2
]}

Vitkova, M. ^{[2
]}

Xia, C. ^{[2
]}

Bernhard, K. ^{[5
,6
]}

Huemmerich, S. ^{[5
,6
]}

机构：

[1] Univ Vienna, Dept Astrophys, Turkenschanz Str 17, A-1180 Vienna, Austria

[2] Masaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, Brno 61137, Czech Republic

[3] Slovak Univ Technol Bratislava, Adv Technol Res Inst, Fac Mat Sci & Technol Trnava, Bottova 25, Trnava 91724, Slovakia

[4] Masaryk Univ, Inst Comp Sci, Brno, Czech Republic

[5] Bundesdeutsche Arbeitsgemeinschaft Veranderl Ster, Berlin, Germany

[6] Amer Assoc Variable Star Observers AAVSO, Cambridge, MA USA

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 687卷

关键词：

stars: chemically peculiar; stars: magnetic field; stars: variables: general; MERCURY-MANGANESE STARS; TESS INPUT CATALOG; STELLAR TRACKS; OPEN CLUSTERS; ASTROPHYSICAL PARAMETERS; FREQUENCY-ANALYSIS; MESA ISOCHRONES; LINE STARS; AP; EVOLUTION;

D O I：

10.1051/0004-6361/202348926

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：24

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