Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.1003s&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #10.03; Bulletin of the American Astronomical Society, Vol. 27, p.826
Astronomy and Astrophysics
Astronomy
Scientific paper
We present analysis of time-resolved near-infrared spectroscopy of the cataclysmic variables RU Pegasi and RX Andromedae. Spectra in the waveband 8000-8700 Angstroms \ were obtained using the goldcam detector on the NOAO 2.1m telescope at Kitt Peak at a time resolution of 23 minutes. Both stars were observed over at least one complete orbital cycle. We have used the these data to obtain orbital velocities for both the late-type secondary star and the white dwarf primary using the Na I absorption lines and a broad component of the Ca II emission lines, respectively. In both systems, we also identify a narrow component in the Ca II lines which we attribute to heating of the side of the secondary facing the hot primary. These narrow lines are in phase with the Na I lines which come unambiguously from the secondary star. These data are used to obtain system orbital parameters, including the mass ratios, inclinations, and the individual component masses. We further consider whether the observed heating of the secondary is due to x-rays from the primary by comparing the x-ray and narrow-line Ca II fluxes.
Mateo Mario
Smith Deano
Szkody Paula
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