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
Comments: Four pages, two figures