Article (Scientific journals)
TESS light curves of γ Cas stars
Nazé, Yaël; Rauw, Grégor; Pigulski, Andrzej
2020In Monthly Notices of the Royal Astronomical Society, 498, p. 3171-3183
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Keywords :
stars: early-type; stars: emission line; Be; stars: massive; stars: variables: general; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] γ Cas stars constitute a subgroup of Be stars showing unusually hard and bright X-ray emission. In search for additional peculiarities, we analysed the TESS light curves of 15 γ Cas analogues. Their periodograms display broad frequency groups and/or narrow isolated peaks, often superimposed over red noise. The detected signals appear at low frequencies, with few cases of significant signals beyond 5 d[SUP]-1[/SUP] (and all of them are faint). The signal amplitudes, and sometimes the frequency content, change with time, even in the absence of outburst events. On the basis of their optical photometric variability, γ Cas stars reveal no distinctive behaviour and thus appear similar to Be stars in general.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Pigulski, Andrzej;  Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, PL-51-622 Wrocław, Poland)
Language :
English
Title :
TESS light curves of γ Cas stars
Publication date :
01 August 2020
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
498
Pages :
3171-3183
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 October 2020

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