Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122...17b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 17-22. Research supported by the Consiglio Naziona
Astronomy and Astrophysics
Astronomy
4
Spaceborne Astronomy, Stellar Spectrophotometry, Stellar Temperature, X Ray Sources, X Ray Spectra, X Ray Stars, Binary Stars, Iue, O Stars, Satellite Observation, Spectral Resolution, Stellar Gravitation, Stellar Magnitude
Scientific paper
Seven low-resolution ultraviolet spectra of X Per obtained with the IUE satellite between March 20 - 29, 1980 are analysed. If the star is a member of the Per OB 2 association, with an assumed distance d = 340 ± 20 pc, it follows that the absolute visual magnitude is Mv = -2.3 ± 0.2, the radius R = (4.1 ± 0.6) R_sun; and the mass is M = (12 ± 4) M_sun;. These values and the temperature of 25,000K are consistent with a spectral type near B1-B1.5 if the star is on the zero-age main sequence. The upper limit on the variability of the ultraviolet continuum due to heating by the X-ray source in a binary system with X Per as primary is 0.1 mag. The upper limit to any variable Lyman-alpha emission component possibly induced by the X-rays and correlated with the 22.4 h period, is 0.4 mag. A by-product of this analysis is a repeatability study of the IUE low-resolution images on short timescales.
Bernacca Pier L.
Bianchi Luciana
Dorren David J.
Perryman Michael . A. C.
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