Are late B-type stars intrinsic X-ray emitters?

Details Are late B-type stars intrinsic X-ray emitters? Are late B-type stars intrinsic X-ray emitters?

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292l...5b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. L5-L8

Astronomy and Astrophysics

Astronomy

54

A Stars, B Stars, Binary Stars, Sky Surveys (Astronomy), X Ray Astronomy, X Ray Stars, Astronomical Catalogs, Heao 2, Rosat Mission, X Ray Imagery

Scientific paper

In the ROSAT all-sky survey close to one hundred X-ray sources have been identified with late B-type stars of spectral type B7 - B9. Previous X-ray observations have suggested that stars in this spectral range are devoid of X-ray emission. In order to study whether late B-type stars represent a new class of X-ray sources or whether the detected X-ray emission originates from a companion star we have selected a sample of known visual binaries, with a late B-type star as the primary and detected in the ROSAT all-sky survey, for follow-up observations with the ROSAT High Resolution Imager (HRI). In the first 8 systems studied with the HRI we could identify 6 late B-type stars and an Ap star as the X-ray source. Our observations cast doubts on the usual argument that in the case of an X-ray emitting late B-type star with a late-type companion, the X-ray emission always coems from the companion star.

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