Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..960y&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 960-968.
Astronomy and Astrophysics
Astrophysics
80
Companion Stars, Dwarf Stars, Infrared Spectra, Novae, Stellar Spectrophotometry, Charge Coupled Devices, Near Infrared Radiation, Stellar Magnitude, Stellar Mass Accretion, Titanium Oxides
Scientific paper
Near-infrared CCD spectra of six cataclysmic binaries have been obtained in an attempt to detect their red dwarf components. Similar observations of M dwarfs yield a classification scheme, based on TiO bands, which can be used to describe the red dwarfs in cataclysmic binaries. Observations of AM Her while in its low state revealed a red dwarf of type M4(+) V and a distance of 80 pc. The red dwarf in DQ Her was detected in an observation centered on mid-eclipse. The red star in DQ Her has a spectral type of M3(+) V, a mass = 0.32 solar mass, and a radius = 0.45 solar radius. The red star in DQ Her does not lie on the main sequence; although its temperature is correct for its mass, the radius is 25% too large. A spectroscopic distance estimate of 400 pc to the DQ Her binary system was obtained; in four additional systems, the red dwarf defied detection. Lower limits to their distances are given.
Schneider David P.
Young Patrick
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