X-ray observations of the runaway stars HD 206327 and 26 Cephei and of the Lambda-1 Orionis region

Details X-ray observations of the runaway stars HD 206327 and 26 Cephei and of the Lambda-1 Orionis region X-ray observations of the runaway stars HD 206327 and 26 Cephei and of the Lambda-1 Orionis region

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..183s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 183-187.

Astronomy and Astrophysics

Astronomy

6

B Stars, O Stars, Star Clusters, Variable Stars, X Ray Astronomy, X Ray Sources, Early Stars, Heao 2, Stellar Luminosity, Stellar Radiation

Scientific paper

Observations made with the IPC on the HEAO 2 satellite (Einstein Observatory) are reported for the runaway OB-type stars HD 206327 and 26 Cephei and also of the Lambda-1 Orionis region. Only upper limits for the X-ray emissions from the two runaway stars were determined. Assuming both of these stars to have compact stellar companions, then these limits, when combined with a suitable model, predict that both systems should have orbital periods greater than about 150 days and possibly ranging up into years. Moreover, a single imaging proportional counter (IPC) observation of the region centered on Lambda-1 Orionis has found five serendipitous X-ray sources. An astrometric and photometric study of this region provides evidence that these sources are probable members of the association. The inferred luminosities range from 5 x 10 to the 30th to 5 x 10 to the 31st ergs/s. Two of the sources are identified with normal OB stars, and the others are most likely pre-main-sequence stars that have evolved from T Tauri stars and will be soon burning hydrogen in their cores.

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