The peculiar Of?p stars HD 108 and HD 191612

Details The peculiar Of?p stars HD 108 and HD 191612 The peculiar Of?p stars HD 108 and HD 191612

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mshe.work...31n&link_type=abstract

"Proceedings of "Massive Stars and High-Energy Emission in OB Associations", a workshop of the JENAM 2005, "Distant Worlds", hel

Physics

1

Scientific paper

The Of?p spectral category was introduced by Walborn in 1972 to describe peculiar stars which possess intense emission lines of C III 4647,4650,4651. Recently, two of them, HD 108 and HD 191612, were found to display spectacular line profile variations in the visible domain: these stars apparently alternate between two different spectral states (O6-O8). To discover the origin of this intriguing behaviour, a multiwavelength campaign was undertaken. In this context, the analysis of the X-ray emission is especially important since it provides crucial information for constraining the nature of these peculiar objects and testing conflicting models. We are therefore carrying out high-quality XMM-Newton observations of these stars and we present the results of the data obtained up to now.

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