Near-infrared time-resolved spectroscopy of the cataclysmic variable YY Draconis

Abstract

view Abstract Citations (35) References (52) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Near-Infrared Time-resolved Spectroscopy of the Cataclysmic Variable YY Draconis Mateo, Mario ; Szkody, Paula ; Garnavich, Peter Abstract Time-resolved near-infrared (8100-8600 A) spectrophotometry and Johnson B-band CCD photometry of the cataclysmic binary YY Dra are presented. The spectra show the presence of the Na I doublet in absorption from the secondary, as well as sharp and broad Ca II emission lines. The sharp Ca II emission lines appear to originate on or near the secondary star because they are visible only during superior conjunction of the secondary star, their radial velocities vary in phase with the Na I absorption lines, and their K-velocity is considerably smaller than observed for the Na I lines. The radial velocity variation of the Na I near-infrared doublet yield an orbital period for YY Dra of P = 0.164988 + or - 0.00023 days. A spectral type of dM 4 + or - 1 for the secondary star is deduced based on the strength of its near-infrared spectral features. The distance to YY Dra is 155 + or - 35 pc based on an application of Bailey's method. Publication: The Astrophysical Journal Pub Date: March 1991 DOI: 10.1086/169823 Bibcode: 1991ApJ...370..370M Keywords: Astronomical Spectroscopy; Binary Stars; Cataclysmic Variables; Line Spectra; Near Infrared Radiation; Astronomical Photometry; Charge Coupled Devices; Dwarf Stars; Emission Spectra; Radial Velocity; Astrophysics; CA II EMISSION; STARS: BINARIES; STARS: DWARF NOVAE; STARS: INDIVIDUAL CONSTELLATION NAME: YY DRACONIS full text sources ADS | data products SIMBAD (5)