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TYC 2254-927-1


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South galactic CAP G and K stars with infrared excesses
Near-infrared and IRAS photometry is discussed for 13 G and K stars inthe south galactic cap. Five of them show a strong flux excess at 12microns as would be expected from dust shells emitting at temperaturesof several hundred Kelvin. One of them (XY Tau) has previously beenclassified as a 206-d Mira, but the new observations suggest it isactually a variable F or G star. The most likely explanation is that theoriginal classification was wrong and that it is in fact apremain-sequence star. The other four stars are either in very unusualevolutionary states or they are binary systems. The presence oflong-term variations in the near-infrared flux of the flare star CC Eriis reported. The colors are redder when the star is fainter, and thevariations might be associated with the star spot cycle.

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观测天体数据

星座:飛馬座
右阿森松:23h40m42.94s
赤纬:+25°47'18.1"
视星:8.316
距离:534.759 天文距离
右阿森松适当运动:5
赤纬适当运动:-11.8
B-T magnitude:10.498
V-T magnitude:8.497

目录:
适当名称   (Edit)
TYCHO-2 2000TYC 2254-927-1
USNO-A2.0USNO-A2 1125-19899893
HIPHIP 116827

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