UX Monocerotis: New Photometric and Spectroscopic Observations, Solutions, and Anomalies in an Active Mass-Transferring Binary

Details UX Monocerotis: New Photometric and Spectroscopic Observations, Solutions, and Anomalies in an Active Mass-Transferring Binary UX Monocerotis: New Photometric and Spectroscopic Observations, Solutions, and Anomalies in an Active Mass-Transferring Binary

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2385o&link_type=abstract

Astronomical Journal v.110, p.2385

Astronomy and Astrophysics

Astronomy

9

Stars: Individual: Ux Monocerotis, Binaries: Eclipsing, Cataclysmic Variables

Scientific paper

We present new five-color photometry and CCD spectroscopy of the active totally eclipsing binary UX Monocerotis. Spectra yield a cool-star radial-velocity curve with velocity half amplitude 108 km s-1, in conflict with Struve's earlier value. Out-of-eclipse brightness fluctuations noted by several observers apparently have little effect on the geometry of simultaneous Iγbυ solutions, which give a photometric mass ratio ≍0.8 (inverting the earlier Struve mass ratio). The hot star is near its rotational limit. The mass-transferring stream strikes the hot-star photosphere. Light curves show evidence of electron scattering in circumstellar matter and a "warm spot" from stream impact. Binary geometry is consistent with the Hiltner et al. [ApJ, 112, 504 (1950)] light curve, ruling out an appreciable net radius change in either star over the last 40 years. Intense transient mass-transfer bursts may occur in this binary. The hot-star δ Scuti-like variations found by Scaltriti are absent from our data.

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