A time-resolved spectroscopic study of the SU Ursae Majoris dwarf nova YZ CANCRI

Details A time-resolved spectroscopic study of the SU Ursae Majoris dwarf nova YZ CANCRI A time-resolved spectroscopic study of the SU Ursae Majoris dwarf nova YZ CANCRI

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..178s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Jan. 1988, p. 178-189.

Astronomy and Astrophysics

Astronomy

34

Astronomical Spectroscopy, Dwarf Novae, Stellar Spectra, Emission Spectra, Periodic Variations, Radial Velocity, White Dwarf Stars

Scientific paper

A radial-velocity study of the SU UMa dwarf nova YZ Cnc is presented. The observations establish the orbital period of YZ Cnc to be 0.0868±0.0002 day. The authors have estimated the amplitude of the radial-velocity curve of the white dwarf from variations of the Hα and He I λ5876 emission lines. They find that Kem≈ 50 km s-1 with an estimated error of 20 km s-1. The low K velocity suggests that either the white dwarf is massive or the orbital inclination is small, or both. The authors argue, based on the observed emission-line width, that the white dwarf mass and orbital inclination are likely to be near 0.8 M_sun; and 40°, respectively. Low-resolution spectra obtained during an eruption and during a subsequent quiescent period are also discussed.

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