Analysis of eight magnetic chemically peculiar stars with
rotational modulation

J 2022

Analysis of eight magnetic chemically peculiar stars with rotational modulation

KOBZAR, O.; V. KHALACK; D. BOHLENDER; G. MATHYS; M. E. SHULTZ et. al.

Basic information

Original name

Analysis of eight magnetic chemically peculiar stars with rotational modulation

Authors

KOBZAR, O. (guarantor); V. KHALACK; D. BOHLENDER; G. MATHYS; M. E. SHULTZ; D. M. BOWMAN; Ernst PAUNZEN (40 Austria, belonging to the institution); C. LOVEKIN; A. DAVID-URAZ; J. SIKORA; P. LAMPENS and O. RICHARD

Edition

Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2022, 0035-8711

Other information

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

References:

URL URL

Impact factor

Impact factor: 4.800

RIV identification code

RIV/00216224:14310/22:00128187

Organization unit

Faculty of Science

DOI

https://doi.org/10.1093/mnras/stac2799

UT WoS

000881809100005

EID Scopus

2-s2.0-85145354588

Keywords in English

stars: chemically peculiar; stars: fundamental parameters; stars: individual: HD 10840; HD 22920; HD 24712; HD 38170; HD 63401; HD 74521; HD 77314; HD 86592; stars: magnetic field; stars: rotation

Abstract

In the original language

Since the end of 2018, the Transiting Exoplanet Survey Satellite (TESS) has provided stellar photometry to the astronomical community. We have used TESS data to study rotational modulation in the light curves of a sample of chemically peculiar stars with measured large-scale magnetic fields (mCP stars). In general, mCP stars show inhomogeneous distributions of elements in their atmospheres that lead to spectroscopic (line profile) and photometric (light curve) variations commensurate with the rotational period. We analyzed the available TESS data from 50 sectors for eight targets after post-processing them in order to minimize systematic instrumental trends. Analysis of the light curves allowed us to determine rotational periods for all eight of our targets. For each star, we provide a phase diagram calculated using the derived period from the light curves and from the available measurements of the disc-averaged longitudinal magnetic field < B-z >. In most cases, the phased light curve and < B-z > measurements show consistent variability. Using our rotation periods, and global stellar parameters derived from fitting Balmer line profiles, and from Geneva and Stromgren-Crawford photometry, we determined the equatorial rotational velocities and calculated the respective critical rotational fractions v(eq)/v(crit). We have shown from our sample that the critical rotational fraction decreases with stellar age, at a rate consistent with the magnetic braking observed in the larger population of mCP stars.

Cite

KOBZAR, O.; V. KHALACK; D. BOHLENDER; G. MATHYS; M. E. SHULTZ; D. M. BOWMAN; Ernst PAUNZEN; C. LOVEKIN; A. DAVID-URAZ; J. SIKORA; P. LAMPENS and O. RICHARD. Analysis of eight magnetic chemically peculiar stars with rotational modulation. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2022, vol. 517, No 4, p. 5340-5357. ISSN 0035-8711. Available from: https://doi.org/10.1093/mnras/stac2799.

@article{2248122,
   author = {Kobzar, O. and Khalack, V. and Bohlender, D. and Mathys, G. and Shultz, M. E. and Bowman, D. M. and Paunzen, Ernst and Lovekin, C. and DavidandUraz, A. and Sikora, J. and Lampens, P. and Richard, O.},
   article_number = {4},
   doi = {https://doi.org/10.1093/mnras/stac2799},
   keywords = {stars: chemically peculiar; stars: fundamental parameters; stars: individual: HD 10840; HD 22920; HD 24712; HD 38170; HD 63401; HD 74521; HD 77314; HD 86592; stars: magnetic field; stars: rotation},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {Analysis of eight magnetic chemically peculiar stars with rotational modulation},
   url = {https://arxiv.org/pdf/2208.03301.pdf},
   volume = {517},
   year = {2022}
}

TY  - JOUR
ID  - 2248122
AU  - Kobzar, O. - Khalack, V. - Bohlender, D. - Mathys, G. - Shultz, M. E. - Bowman, D. M. - Paunzen, Ernst - Lovekin, C. - David-Uraz, A. - Sikora, J. - Lampens, P. - Richard, O.
PY  - 2022
TI  - Analysis of eight magnetic chemically peculiar stars with rotational modulation
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 517
IS  - 4
SP  - 5340-5357
EP  - 5340-5357
PB  - Oxford University Press
SN  - 00358711
KW  - stars: chemically peculiar
KW  - stars: fundamental parameters
KW  - stars: individual: HD 10840
KW  - HD 22920
KW  - HD 24712
KW  - HD 38170
KW  - HD 63401
KW  - HD 74521
KW  - HD 77314
KW  - HD 86592
KW  - stars: magnetic field
KW  - stars: rotation
UR  - https://arxiv.org/pdf/2208.03301.pdf
N2  - Since the end of 2018, the Transiting Exoplanet Survey Satellite (TESS) has provided stellar photometry to the astronomical community. We have used TESS data to study rotational modulation in the light curves of a sample of chemically peculiar stars with measured large-scale magnetic fields (mCP stars). In general, mCP stars show inhomogeneous distributions of elements in their atmospheres that lead to spectroscopic (line profile) and photometric (light curve) variations commensurate with the rotational period. We analyzed the available TESS data from 50 sectors for eight targets after post-processing them in order to minimize systematic instrumental trends. Analysis of the light curves allowed us to determine rotational periods for all eight of our targets. For each star, we provide a phase diagram calculated using the derived period from the light curves and from the available measurements of the disc-averaged longitudinal magnetic field < B-z >. In most cases, the phased light curve and < B-z > measurements show consistent variability. Using our rotation periods, and global stellar parameters derived from fitting Balmer line profiles, and from Geneva and Stromgren-Crawford photometry, we determined the equatorial rotational velocities and calculated the respective critical rotational fractions v(eq)/v(crit). We have shown from our sample that the critical rotational fraction decreases with stellar age, at a rate consistent with the magnetic braking observed in the larger population of mCP stars.
ER  -

KOBZAR, O.; V. KHALACK; D. BOHLENDER; G. MATHYS; M. E. SHULTZ; D. M. BOWMAN; Ernst PAUNZEN; C. LOVEKIN; A. DAVID-URAZ; J. SIKORA; P. LAMPENS and O. RICHARD. Analysis of eight magnetic chemically peculiar stars with rotational modulation. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2022, vol.~517, No~4, p.~5340-5357. ISSN~0035-8711. Available from: https://doi.org/10.1093/mnras/stac2799.

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