CoRoT's view on variable B8/9 stars: spots versus pulsations: Evidence for differential rotation in HD 174648
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.
Keywords
Cite
@article{arxiv.1110.5601,
title = {CoRoT's view on variable B8/9 stars: spots versus pulsations: Evidence for differential rotation in HD 174648},
author = {P. Degroote and B. Acke and R. Samadi and C. Aerts and D. W. Kurtz and A. Noels and A. Miglio and J. Montalban and S. Bloemen and A. Baglin and F. Baudin and C. Catala and E. Michel and M. Auvergne},
journal= {arXiv preprint arXiv:1110.5601},
year = {2015}
}
Comments
16 pages, 18 figures, accepted for publication by Astronomy and Astrophysics