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HD 63712


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Simultaneous UV and optical observations of sigma G an RS CVn-like star: Preliminary results
Some UV spectra of sigma Gem are discussed. The ground-basedobservations include medium dispersion (40 A/mm) optical spectra and UBVphotoelectric photometry. The binary system belongs to the long-periodgroup. The width at the base of the K line of Mg II was found tocorrespond to 430 + or - 20 km/s, implying a value Msubv=-4.9 + or -0.3. This improbably large luminosity for a Ki III star indicates thatthe Weiler-Oegele relation does not work in this case. The shortwavelength low resolution International Ultraviolet Explorer spectrashow the strong activity of the system. The long wavelength spectrumshows only the resolved Mg doublet and a trace of rising continuum atthe long wavelength end. Ground based UBV data are in agreement withother observations.

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观测天体数据

星座:雙子座
右阿森松:07h51m26.59s
赤纬:+29°10'04.8"
视星:7.012
距离:387.597 天文距离
右阿森松适当运动:-4.8
赤纬适当运动:4.9
B-T magnitude:8.089
V-T magnitude:7.101

目录:
适当名称   (Edit)
HD 1989HD 63712
TYCHO-2 2000TYC 1937-1537-1
USNO-A2.0USNO-A2 1125-05385991
HIPHIP 38363

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