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HD 64535


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Selection of standard stars for photometric observations with the 91-cm reflector at Okayama
Not Available

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
Not Available

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Ikizler
Sað Açýklýk:07h55m08.58s
Yükselim:+21°40'16.8"
Görünürdeki Parlaklýk:8.652
Uzaklýk:330.033 parsek
özdevim Sað Açýklýk:-15.1
özdevim Yükselim:3.6
B-T magnitude:9.068
V-T magnitude:8.687

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 64535
TYCHO-2 2000TYC 1375-427-1
USNO-A2.0USNO-A2 1050-05472717
HIPHIP 38678

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