A spectrophotometric study of ultraviolet and X-ray sources with objective prism plates

Details A spectrophotometric study of ultraviolet and X-ray sources with objective prism plates A spectrophotometric study of ultraviolet and X-ray sources with objective prism plates

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..133v&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 133-136.

Astronomy and Astrophysics

Astronomy

5

B Stars, O Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, X Ray Sources, Balmer Series, Energy Spectra, H Alpha Line, Prisms, Ultraviolet Spectrophotometers

Scientific paper

Several objective prism spectra of objects known to have large ultraviolet or X-ray fluxes are discussed. A marked Balmer excess and H alpha emission are found in X Per(= 3U 0352 + 30) and in the similar Be star HD 200775. No Balmer discontinuity is detectable in HD 226868 (Cyg X-1) during the low X-ray states, in HZ 43 (MX 1313 + 29), and in the hot subluminous star BD + 37 deg 1977. Comparison with the far ultraviolet spectrum of this star (Carnochan et al., 1975) leads to the conclusion that the star is slightly reddened (EB-V = 0.15 plus or minus 0.05) with an optical-ultraviolet energy distribution close to a 100,000 K black-body.

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