Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265l..41m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. L41-L44.
Astronomy and Astrophysics
Astronomy
47
B Stars, O Stars, Rosat Mission, Sky Surveys (Astronomy), X Ray Astronomy, Color-Color Diagram, Companion Stars, Spaceborne Astronomy, Stellar Evolution, Stellar Models, White Dwarf Stars
Scientific paper
We present preliminary results of the X-ray part of an extensive multiwavelength study of bright OB- and OBe-type stars, aimed at finding evidence for the existence of white-dwarf companions to Be stars. After analysis of 75 percent of the ROSAT all-sky survey, X-ray emission is detected from 129 out of 1026 OB stars in the Bright Star Catalogue, 10 of which are OBe-type stars. However, no indications for white-dwarf companions could yet be found. The ROSAT X-ray luminosities range from 10 exp -8 to 10 exp -4 times the bolometric luminosities, for both OB and OBe stars. We notice that Beta Cep stars have a softer X-ray spectrum than normal early-type B stars. The X-ray emission in O and early type B stars appears consistent with the generally accepted idea of originating from shocks in radiatively driven winds. For later type B stars the situation is less clear: one possibility is chromospheric emission from late-type companions.
Burki Gilbert
Cote Jean
de Martino Domitilla
Meurs Evert J. A.
Paradijs Jan van
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