Time-resolved spectrophotometry of the Nova-like variable UX Ursa Majoris

Details Time-resolved spectrophotometry of the Nova-like variable UX Ursa Majoris Time-resolved spectrophotometry of the Nova-like variable UX Ursa Majoris

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...53..397s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 53, Oct. 1983, p. 397-412.

Astronomy and Astrophysics

Astrophysics

37

Dwarf Novae, Eclipsing Binary Stars, Stellar Spectrophotometry, Temporal Resolution, Variable Stars, H Beta Line, H Gamma Line, Helium Ions, Hydrogen Clouds, Light Curve, Line Shape, Magnesium, Radial Velocity

Scientific paper

Observations of the novalike system UX UMa made in February 1981, and April 1982, with the IIDS on the 2.1-m telescope at KPNO are reported and analyzed. A total of 262 time-resolved photometric-quality spectra were obtained and used to generate continuum light curves, emission-line flux measurements, line profiles, and radial velocities at all phases for two epochs. UX UMa had bumps in its continuum light curve before and after the approximately 0.95-mag-deep, 0.06-period-long 1981 eclipse but none in the 0.91-mag, 0.05-period 1982 eclipse; mean nonhotspot out-of-eclipse flux levels were about 15 and 19 picoergs/sq cm sec, respectively. The differences are attributed to an outburst of about 0.25 mag. The behavior of the H-beta, H-gamma, and He II, emissions and He I, Mg II absorption is illustrated with graphs and gray-scale images and discussed. It is suggested that the bulk of the He II emission in 1981 and 1982 originated in the hot spot and the disk, respectively. No s-curve pattern is observed in the H emissions, but a third component about 150 deg out of phase is detected.

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