Evidence for short-term variations in two O-type stars

De Becker M., Linder N., Rauw G.

Institut d'Astrophysique et Geophysique, University of Liege

Only a few O-type stars are known to display short-term (a fraction of a day) variations. Intense spectroscopic monitoring of the ON8V star HD 13268 revealed low amplitude variations with periods of several hours. In addition, observations of the SB1 system HD 15137 revealed variations on a time scale of a few hours. We consider these stars to be a good candidates for non radial pulsations, even though variations related to inhomogeneities in a circumstellar disk can not be rejected.

Reference: IBVS, 5841
Status: Manuscript has been accepted

Weblink: http://www.konkoly.hu/cgi-bin/IBVS?5841

Comments: Four pages, two figures

Email: debecker@astro.ulg.ac.be