Details

Autor(en) / Beteiligte

• Balona, L A
• Handler, G
• Chowdhury, S
• Ozuyar, D
• Engelbrecht, C A
• Mirouh, G M
• Wade, G A
• David-Uraz, A
• Cantiello, M

Titel

Rotational modulation in TESS B stars

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2019-05, Vol.485 (3), p.3457-3469

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract Light curves and periodograms of 160 B stars observed by the Transiting Exoplanet Survey Satellite (TESS) space mission and 29 main-sequence B stars from Kepler and K2 were used to classify the variability type. There are 114 main-sequence B stars in the TESS sample, of which 45 are classified as possible rotational variables. This confirms previous findings that a large fraction (about 40 per cent) of A and B stars may exhibit rotational modulation. Gaia DR2 parallaxes were used to estimate luminosities, from which the radii and equatorial rotational velocities can be deduced. It is shown that observed values of the projected rotational velocities are lower than the estimated equatorial velocities for nearly all the stars, as they should be if rotation is the cause of the light variation. We conclude that a large fraction of main-sequence B stars appear to contain surface features which cannot likely be attributed to abundance patches.