New magnetic chemically peculiar stars and candidates in the
ATLAS first catalogue of variable stars

BERNHARD, Klaus, Stefan HÜMMERICH, Ernst PAUNZEN and Johana SUPÍKOVÁ. New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2021, vol. 506, No 3, p. 4561-4577. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stab2065.

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TY  - JOUR
ID  - 1855747
AU  - Bernhard, Klaus - Hümmerich, Stefan - Paunzen, Ernst - Supíková, Johana
PY  - 2021
TI  - New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 506
IS  - 3
SP  - 4561-4577
EP  - 4561-4577
PB  - Oxford University Press
SN  - 00358711
KW  - stars: chemically peculiar
KW  - stars: variables: general
UR  - https://academic.oup.com/mnras/article-abstract/506/3/4561/6324590
N2  - The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with this development. Here we show that the ‘upside-down CBH variables’, which were proposed as a potentially new class of variable stars by Heinze et al. in the ATLAS First Catalogue of Variable Stars, are, at least to a high percentage, made up of α2 Canum Venaticorum (ACV) variables – that is, photometrically variable magnetic chemically peculiar (CP2/He-peculiar) stars – with distinct double-wave light curves. Using suitable selection criteria, we identified 264 candidate ACV variables in the ATLAS variable star catalogue. 62 of these objects were spectroscopically confirmed with spectra from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (all new discoveries except for nine stars) and classified on the MK system. The other 202 stars are here presented as ACV star candidates that require spectroscopic confirmation. The vast majority of our sample of stars are main-sequence objects. Derived masses range from 1.4 M⊙ to 5 M⊙, with half our sample stars being situated in the range from 2 M⊙ to 2.4 M⊙, in good agreement with the spectral classifications. Most stars belong to the thin or thick disc; four objects, however, classify as members of the halo population. With a peak magnitude distribution at around 14th magnitude, the here presented stars are situated at the faint end of the known Galactic mCP star population. Our study highlights the need to consider rare variability classes, like ACV variables, in automated classification routines.
ER  -

Basic information
Original name	New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars
Authors	BERNHARD, Klaus, Stefan HÜMMERICH, Ernst PAUNZEN (40 Austria, belonging to the institution) and Johana SUPÍKOVÁ (203 Czech Republic, belonging to the institution).
Edition	Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2021, 0035-8711.

Other information
Original language	English
Type of outcome	Article in a journal
Field of Study	10308 Astronomy
Country of publisher	United Kingdom of Great Britain and Northern Ireland
Confidentiality degree	is not subject to a state or trade secret
WWW	URL
Impact factor	Impact factor: 5.235
RIV identification code	RIV/00216224:14310/21:00125882
Organization unit	Faculty of Science
Doi	http://dx.doi.org/10.1093/mnras/stab2065
UT WoS	000741355900027
Keywords in English	stars: chemically peculiar; stars: variables: general
Tags	rivok
Tags	International impact, Reviewed
Changed by	Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 25/5/2022 10:48.

Abstract

The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with this development. Here we show that the ‘upside-down CBH variables’, which were proposed as a potentially new class of variable stars by Heinze et al. in the ATLAS First Catalogue of Variable Stars, are, at least to a high percentage, made up of α2 Canum Venaticorum (ACV) variables – that is, photometrically variable magnetic chemically peculiar (CP2/He-peculiar) stars – with distinct double-wave light curves. Using suitable selection criteria, we identified 264 candidate ACV variables in the ATLAS variable star catalogue. 62 of these objects were spectroscopically confirmed with spectra from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (all new discoveries except for nine stars) and classified on the MK system. The other 202 stars are here presented as ACV star candidates that require spectroscopic confirmation. The vast majority of our sample of stars are main-sequence objects. Derived masses range from 1.4 M⊙ to 5 M⊙, with half our sample stars being situated in the range from 2 M⊙ to 2.4 M⊙, in good agreement with the spectral classifications. Most stars belong to the thin or thick disc; four objects, however, classify as members of the halo population. With a peak magnitude distribution at around 14th magnitude, the here presented stars are situated at the faint end of the known Galactic mCP star population. Our study highlights the need to consider rare variability classes, like ACV variables, in automated classification routines.

Links
98507, interní kód MU	Name: European Collaborating Astronomer ProjectS: Espana-Czechia-Slovakia (Acronym: ECAPS:E-C-S)
98507, interní kód MU	Investor: European Union, Strategic Partnerships in the field of education, training and youth

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New magnetic chemically peculiar stars and candidates in the ATLAS first catalogue of variable stars

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