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HD 64535


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Selection of standard stars for photometric observations with the 91-cm reflector at Okayama
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The infrared light curve of U Geminorum
IR observations of the dwarf nova U Geminorum show the periodic doublewave of an ellipsoidal variable, with an amplitude of 0.25 mag, which isreproduced in calculations of the rotational light curve of the tidallydistorted red dwarf star in the system. This star, which is required tofill U Geminorum's Roche lobe, exhibits a variation amplitude which isconsistent with (1) the expected geometrical elements of the system, (2)convective gravity darkening, and (3) a moderate degree of limbdarkening. Agreement with observations is improved by the reflectioneffect if only about 1/4 of the observed hot star luminosity is seen bythe cool star. The ellipsoidal variation marks the orbital conjunctionsfor reference with the times of the optical eclipse of the bright spot.The system's IR colors are those of a middle M dwarf star.

Three-Color Photometry of U Geminorum During an Outburst
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Observation and Astrometry data

Constellation:Δίδυμοι
Right ascension:07h55m08.58s
Declination:+21°40'16.8"
Apparent magnitude:8.652
Distance:330.033 parsecs
Proper motion RA:-15.1
Proper motion Dec:3.6
B-T magnitude:9.068
V-T magnitude:8.687

Catalogs and designations:
Proper Names
HD 1989HD 64535
TYCHO-2 2000TYC 1375-427-1
USNO-A2.0USNO-A2 1050-05472717
HIPHIP 38678

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