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HD 180002


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Southern subdwarf photometry
UBV photometry and normalized UV excesses are reported for 176 southernmetal-poor stars selected from the objective-prism survey of Bidelmanand MacConnell (1973) as well as 49 other metal-deficient starsidentified in other surveys. Photometry is also presented for 32 otherstars lying near the 225 program stars (although not explicitlyidentified as such in the text, the program stars are apparentlysubdwarfs and subdwarf candidates). Previously determined spectral typesand degrees of line weakening are given for the 225 stars, andmetallicities are estimated on the basis of the degrees of lineweakening. It is noted that 33 F and G stars with extreme meannormalized UV excesses of approximately 0.22 mag have a mean Fe/H valueof -1.4 and probably represent halo subdwarfs, while 82 F and G starswith moderate UV excesses are mostly old disk stars.

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观测天体数据

星座:望遠鏡座
右阿森松:19h16m56.21s
赤纬:-45°53'43.7"
视星:9.807
右阿森松适当运动:12.3
赤纬适当运动:-32.3
B-T magnitude:10.302
V-T magnitude:9.848

目录:
适当名称   (Edit)
HD 1989HD 180002
TYCHO-2 2000TYC 8375-1386-1
USNO-A2.0USNO-A2 0375-37475430
HIPHIP 94762

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