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MOBSTER - II. Identification of rotationally variable A stars observed with TESS in sectors 1-4
Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada;Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000, Kingston, ON K7K 7B4, Canada.
Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA.
Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.
Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 4, p. 4695-4710Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 487, no 4, p. 4695-4710
Keywords [en]
stars: early-type, stars: magnetic field, stars: rotation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-390489DOI: 10.1093/mnras/stz1581ISI: 000475888500018OAI: oai:DiVA.org:uu-390489DiVA, id: diva2:1341898
Funder
EU, European Research Council, 670519Swedish Research Council, 621-2014-5720Swedish National Space Board, 185/14Swedish National Space Board, 137/17Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Kochukhov, Oleg

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