MOBSTER - II. Identification of rotationally variable A stars
observed with TESS in sectors 1-4

J 2019

MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4

SIKORA, James; Alexandre DAVID-URAZ; Sowgata CHOWDHURY; Dominic BOWMAN; Gregg WADE et. al.

Basic information

Original name

MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4

Authors

SIKORA, James (124 Canada); Alexandre DAVID-URAZ (840 United States of America); Sowgata CHOWDHURY (356 India); Dominic BOWMAN (124 Canada); Gregg WADE (124 Canada); Viktor KHALACK (124 Canada); Oleh KOBZAR (616 Poland); Oleg KOCHUKHOV (752 Sweden); Coralie NEINER (56 Belgium) and Ernst PAUNZEN (40 Austria, guarantor, belonging to the institution)

Edition

Monthly Notices of the Royal Astronomical Society, OXFORD, OXFORD UNIV PRESS, 2019, 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

Impact factor

Impact factor: 5.357

RIV identification code

RIV/00216224:14310/19:00111172

Organization unit

Faculty of Science

DOI

https://doi.org/10.1093/mnras/stz1581

UT WoS

000475888500018

EID Scopus

2-s2.0-85070060359

Keywords in English

stars: early-type; stars: magnetic field; stars: rotation

Abstract

In the original language

Recently, high-precision optical 2-min cadence light curves obtained with TESS for targets located in the mission's defined first four sectors have been released. The majority of these high-cadence and high-precision measurements currently span , thereby allowing periodic variability occurring on time-scales to potentially be detected. Magnetic chemically peculiar (mCP) A-type stars are well known to exhibit rotationally modulated photometric variability that is produced by inhomogeneous chemical abundance distributions in their atmospheres. While mCP stars typically exhibit rotation periods that are significantly longer than those of non-mCP stars, both populations exhibit typical periods ; therefore, the early TESS releases are suitable for searching for rotational modulation of the light curves of both mCP and non-mCP stars. We present the results of our search for A-type stars that exhibit variability in their TESS light curves that is consistent with rotational modulation based on the first two data releases obtained from sectors 1 to 4. Our search yielded 134 high-probability candidate rotational variables - 60 of which have not been previously reported. Approximately half of these stars are identified in the literature as Ap (mCP) stars. Comparisons between the subsample of high-probability candidate rotationally variable Ap stars and the subsample of stars that are not identified as Ap reveal that the latter subsample exhibits statistically (i) shorter rotation periods and (ii) significantly lower photometric amplitudes.

Cite

SIKORA, James; Alexandre DAVID-URAZ; Sowgata CHOWDHURY; Dominic BOWMAN; Gregg WADE; Viktor KHALACK; Oleh KOBZAR; Oleg KOCHUKHOV; Coralie NEINER and Ernst PAUNZEN. MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4. Monthly Notices of the Royal Astronomical Society. OXFORD: OXFORD UNIV PRESS, 2019, vol. 487, No 4, p. 4695-4710. ISSN 0035-8711. Available from: https://doi.org/10.1093/mnras/stz1581.

@article{1576459,
   author = {Sikora, James and DavidandUraz, Alexandre and Chowdhury, Sowgata and Bowman, Dominic and Wade, Gregg and Khalack, Viktor and Kobzar, Oleh and Kochukhov, Oleg and Neiner, Coralie and Paunzen, Ernst},
   article_location = {OXFORD},
   article_number = {4},
   doi = {https://doi.org/10.1093/mnras/stz1581},
   keywords = {stars: early-type; stars: magnetic field; stars: rotation},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4},
   url = {https://academic.oup.com/mnras/article-abstract/487/4/4695/5521217?redirectedFrom=fulltext},
   volume = {487},
   year = {2019}
}

TY  - JOUR
ID  - 1576459
AU  - Sikora, James - David-Uraz, Alexandre - Chowdhury, Sowgata - Bowman, Dominic - Wade, Gregg - Khalack, Viktor - Kobzar, Oleh - Kochukhov, Oleg - Neiner, Coralie - Paunzen, Ernst
PY  - 2019
TI  - MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 487
IS  - 4
SP  - 4695-4710
EP  - 4695-4710
PB  - OXFORD UNIV PRESS
SN  - 00358711
KW  - stars: early-type
KW  - stars: magnetic field
KW  - stars: rotation
UR  - https://academic.oup.com/mnras/article-abstract/487/4/4695/5521217?redirectedFrom=fulltext
L2  - https://academic.oup.com/mnras/article-abstract/487/4/4695/5521217?redirectedFrom=fulltext
N2  - Recently, high-precision optical 2-min cadence light curves obtained with TESS for targets located in the mission's defined first four sectors have been released. The majority of these high-cadence and high-precision measurements currently span , thereby allowing periodic variability occurring on time-scales to potentially be detected. Magnetic chemically peculiar (mCP) A-type stars are well known to exhibit rotationally modulated photometric variability that is produced by inhomogeneous chemical abundance distributions in their atmospheres. While mCP stars typically exhibit rotation periods that are significantly longer than those of non-mCP stars, both populations exhibit typical periods ; therefore, the early TESS releases are suitable for searching for rotational modulation of the light curves of both mCP and non-mCP stars. We present the results of our search for A-type stars that exhibit variability in their TESS light curves that is consistent with rotational modulation based on the first two data releases obtained from sectors 1 to 4. Our search yielded 134 high-probability candidate rotational variables - 60 of which have not been previously reported. Approximately half of these stars are identified in the literature as Ap (mCP) stars. Comparisons between the subsample of high-probability candidate rotationally variable Ap stars and the subsample of stars that are not identified as Ap reveal that the latter subsample exhibits statistically (i) shorter rotation periods and (ii) significantly lower photometric amplitudes.
ER  -

SIKORA, James; Alexandre DAVID-URAZ; Sowgata CHOWDHURY; Dominic BOWMAN; Gregg WADE; Viktor KHALACK; Oleh KOBZAR; Oleg KOCHUKHOV; Coralie NEINER and Ernst PAUNZEN. MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4. \textit{Monthly Notices of the Royal Astronomical Society}. OXFORD: OXFORD UNIV PRESS, 2019, vol.~487, No~4, p.~4695-4710. ISSN~0035-8711. Available from: https://doi.org/10.1093/mnras/stz1581.

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