TY  - JOUR
A1  - Oskinova, Lida
A1  - Todt, Helge Tobias
A1  - Huenemoerder, David P.
A1  - Hubrig, Swetlana
A1  - Ignace, Richard
A1  - Hamann, Wolf-Rainer
A1  - Balona, Luis
T1  - On X-ray pulsations in beta Cephei-type variables
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Context. beta Cep-type variables are early B-type stars that are characterized by oscillations observable in their optical light curves. At least one beta Cep-variable also shows periodic variability in X-rays.
 Aims. Here we study the X-ray light curves in a sample of beta Cep-variables to investigate how common X-ray pulsations are for this type of stars.
 Methods. We searched the Chandra and XMM-Newton X-ray archives and selected stars that were observed by these telescopes for at least three optical pulsational periods. We retrieved and analyzed the X-ray data for kappa Sco, beta Cru, and alpha Vir. The X-ray light curves of these objects were studied to test for their variability and periodicity.
 Results. While there is a weak indication for X-ray variability in beta Cru, we find no statistically significant evidence of X-ray pulsations in any of our sample stars. This might be due either to the insufficient data quality or to the physical lack of modulations. New, more sensitive observations should settle this question.
KW  - stars: massive
KW  - stars: variables: general
KW  - X-rays: stars
Y1  - 2015
U6  - https://doi.org/10.1051/0004-6361/201525908
SN  - 0004-6361
SN  - 1432-0746
VL  - 577
PB  - EDP Sciences
CY  - Les Ulis
ER  -