Title: CoRoT's view on variable B8/9 stars: spots versus pulsations Evidence for differential rotation in HD174648
Authors: Degroote, Pieter ×
Acke, Bram
Samadi, Reza
Aerts, Conny
Kurtz, Donald
Noels, Arlette
Miglio, Andrea
Montalban, Josefina
Bloemen, Steven
Baglin, Annie
Baudin, Frederic
Catala, Claude
Michel, Eric
Auvergne, Michel #
Issue Date: Dec-2011
Publisher: EDP Sciences
Series Title: Astronomy and Astrophysics Abstracts vol:536 pages:82
Article number: A82
Abstract: Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the high precision continuous measurements of the CoRoT space satellite, low amplitudes are more easily detected, making a study of this neglected region worthwhile.
Aims: We collected a small sample of B stars observed by CoRoT to determine the origin of the different types of variability observed.
Methods: We combine literature photometry and spectroscopy to measure the fundamental parameters of the stars in the sample, and compare asteroseismic modelling of the light curves with (differentially rotating) spotted star models.
Results: We found strong evidence for the existence of spots and differential rotation in HD 174648, and formulated hypotheses for their origin. We show that the distinction between pulsations and rotational modulation is difficult to make solely based on the light curve, especially in slowly rotating stars.
ISSN: 1432-0746
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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