Further spectroscopic observations of HD 153919 /3U 1700-37/

Details Further spectroscopic observations of HD 153919 /3U 1700-37/ Further spectroscopic observations of HD 153919 /3U 1700-37/

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..164l&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 164-170. Research supported by the University of Toronto and National

Astronomy and Astrophysics

Astrophysics

Astronomical Spectroscopy, Binary Stars, Emission Spectra, Forbidden Bands, Iron, Stellar Mass Ejection, Stellar Spectra, X Ray Sources, Graphs (Charts), Ionized Gases, O Stars, Stellar Coronas, Stellar Luminosity, Stellar Radiation

Scientific paper

New observations of HD 153919 have been searched in an effort to confirm the report of forbidden Fe XIV emission from this star. No emission is found to an upper limit of 26 mA equivalent width. The upper limit for emission from forbidden Fe X, at a wavelength of 6374 A, is 34 mA. It is shown that the mass-loss rate from this star has decreased 20-30% since the observations of Conti and Cowley. It is suggested that the lower mass-loss rate, and the attendant lower X-ray luminosity, might explain the absence of forbidden Fe XIV at the epoch May 1977. An upper limit to the volume of highly ionized gas is 0.55 times the cube of the stellar radius. An upper limit to the thickness of a stellar corona is also derived.

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