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

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. 56 refs.

Authors:
; ;  [1]
  1. Observatories of the Carnegie Institution, Pasadena, CA (USA) Washington Univ., Seattle (USA)
Publication Date:
OSTI Identifier:
5757299
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal; (USA)
Additional Journal Information:
Journal Volume: 370; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BINARY STARS; INFRARED SPECTRA; ERUPTIVE VARIABLE STARS; CHARGE-COUPLED DEVICES; DWARF STARS; EMISSION SPECTRA; NEAR INFRARED RADIATION; PHOTOMETRY; RADIAL VELOCITY; SPECTROPHOTOMETRY; SPECTROSCOPY; ELECTROMAGNETIC RADIATION; INFRARED RADIATION; RADIATIONS; SEMICONDUCTOR DEVICES; SPECTRA; STARS; VARIABLE STARS; VELOCITY; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources

Citation Formats

Mateo, M, Szkody, P, and Garnavich, P. Near-infrared time-resolved spectroscopy of the cataclysmic variable YY Draconis. United States: N. p., 1991. Web. doi:10.1086/169823.
Mateo, M, Szkody, P, & Garnavich, P. Near-infrared time-resolved spectroscopy of the cataclysmic variable YY Draconis. United States. https://doi.org/10.1086/169823
Mateo, M, Szkody, P, and Garnavich, P. 1991. "Near-infrared time-resolved spectroscopy of the cataclysmic variable YY Draconis". United States. https://doi.org/10.1086/169823.
@article{osti_5757299,
title = {Near-infrared time-resolved spectroscopy of the cataclysmic variable YY Draconis},
author = {Mateo, M and Szkody, P and Garnavich, P},
abstractNote = {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. 56 refs.},
doi = {10.1086/169823},
url = {https://www.osti.gov/biblio/5757299}, journal = {Astrophysical Journal; (USA)},
issn = {0004-637X},
number = ,
volume = 370,
place = {United States},
year = {Fri Mar 01 00:00:00 EST 1991},
month = {Fri Mar 01 00:00:00 EST 1991}
}