Article (Scientific journals)
Let there be more variability in two γ Cas stars
Nazé, Yaël; Pigulski, Andrzej; Rauw, Grégor et al.
2020In Monthly Notices of the Royal Astronomical Society, 494, p. 958-974
Peer reviewed
 

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Keywords :
stars: early-type; stars: individual: π Aqr; BZ Cru; stars: massive; stars: variable: general; stars: emission-line; Be; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] We investigate the short-term optical variability of two γ Cas analogues, πAqr and BZ Cru, thanks to intensive ground-based spectroscopic and space-borne photometric monitorings. For both stars, low-amplitude (mmag) coherent photometric variability is detected. The associated signals display long-term amplitude variations, as in other Be stars. However, these signals appear at high frequencies, especially in πAqr, indicating p modes with a high degree l, a quite unusual feature amongst Be stars. While BZ Cru presents only low-level spectral variability, without clear periodicity, this is not the case of πAqr. In this star, the dominant photometric frequencies, near ∼12 d[SUP]-1[/SUP], are confirmed spectroscopically in separate monitorings taken during very different disc activity levels; the spectroscopic analysis suggests a probable tesseral nature for the mode.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Pigulski, Andrzej;  Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622 Wrocław, Poland
Rauw, Grégor  ;  Université de Liège - ULiège > Groupe d'astrophysique des hautes énergies (GAPHE)
Smith, Myron A.;  NSF National Optical-Infrared Astronomy Research Laboratory, 950 N Cherry Ave, Tucson, AZ 85721, USA)
Language :
English
Title :
Let there be more variability in two γ Cas stars
Publication date :
01 March 2020
Journal title :
Monthly Notices of the Royal Astronomical Society
Volume :
494
Pages :
958-974
Peer reviewed :
Peer reviewed
Available on ORBi :
since 20 April 2020

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