A spectroscopic study of the cataclysmic binary star SU Ursae Majoris

Details A spectroscopic study of the cataclysmic binary star SU Ursae Majoris A spectroscopic study of the cataclysmic binary star SU Ursae Majoris

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..721t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 721-731.

Astronomy and Astrophysics

Astrophysics

37

Astronomical Spectroscopy, Cataclysmic Variables, Dwarf Novae, Stellar Spectra, Continuous Spectra, Ephemerides, H Alpha Line, H Beta Line, Line Spectra, Radial Velocity, Stellar Orbits

Scientific paper

The authors report spectroscopic observations of SU UMa, the prototype of a class of short-period cataclysmic binaries. From Hα radial velocity observations, they find the orbital period to be 0.076351±4.3×10-5days (= 110 minutes). They also present an analysis of high-quality spectrograms from the Hale 5 m telescope and double spectrograph. The velocity amplitude of the emission line source is 58±4 km s-1, leading to a mass function ≡1.5×10-3M_sun;. The velocity widths of the Balmer series increase toward higher members of the series, which suggests that pressure broadening may contribute nonnegligibly to the emission line widths.

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