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.

Základní údaje

Originální název

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

Autoři

SIKORA, James (124 Kanada), Alexandre DAVID-URAZ (840 Spojené státy), Sowgata CHOWDHURY (356 Indie), Dominic BOWMAN (124 Kanada), Gregg WADE (124 Kanada), Viktor KHALACK (124 Kanada), Oleh KOBZAR (616 Polsko), Oleg KOCHUKHOV (752 Švédsko), Coralie NEINER (56 Belgie) a Ernst PAUNZEN (40 Rakousko, garant, domácí)

Vydání

Monthly Notices of the Royal Astronomical Society, OXFORD, OXFORD UNIV PRESS, 2019, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.357

Kód RIV

RIV/00216224:14310/19:00111172

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1093/mnras/stz1581

UT WoS

000475888500018

Klíčová slova anglicky

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

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 25. 3. 2020 18:42, Mgr. Marie Šípková, DiS.

Anotace

V originále

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.

Citovat

SIKORA, James, Alexandre DAVID-URAZ, Sowgata CHOWDHURY, Dominic BOWMAN, Gregg WADE, Viktor KHALACK, Oleh KOBZAR, Oleg KOCHUKHOV, Coralie NEINER a 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, roč. 487, č. 4, s. 4695-4710. ISSN 0035-8711. Dostupné z: https://dx.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 = {http://dx.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 a 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, roč.~487, č.~4, s.~4695-4710. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stz1581.

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