IUE spectroscopy, visible-band photometry, and polarimetry of HD 47732 (V641 Monocerotis)

Details IUE spectroscopy, visible-band photometry, and polarimetry of HD 47732 (V641 Monocerotis) IUE spectroscopy, visible-band photometry, and polarimetry of HD 47732 (V641 Monocerotis)

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..731k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 731-740. Research supported by the Trenton State Col

Astronomy and Astrophysics

Astronomy

10

Astronomical Photometry, Binary Stars, Hot Stars, Iue, Polarimetry, Stellar Winds, Ultraviolet Astronomy, Continuous Spectra, Interstellar Radiation, Light Curve, Spectral Line Width, Stellar Spectra

Scientific paper

Several high- and low-dispersion IUE spectra are described for the hot, massive close binary HD 47732. The stellar silicon lines do not show theoretically expected strength, the weakness being attributed to incipicent emission. A weak stellar wind is measurable with an expansion velocity of about 500 km/s. There is difficulty in fitting a model atmosphere to all of the IUE continuum and visible band and IR measures. These difficulties are resolved by appealing to a 22,500 K model atmosphere and a distinctive interstellar extinction law. Numerous V band measures show the polarization to be variable, but not strongly in a phased-locked way. This suggests sporadic outbursts of gas feeding the shell. Several seasonal V band light curves are discussed, and the seasonal variations among them are attributed to variable developments of a systemic shell which scatters the photospheric light and dilutes to a variable degree the light variation due to ellipticity of figure of the component stars.

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