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HD 194477


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Subdwarf studies. I - UBVRI photometry of NLTT stars
UBVRI photometry is presented for a sample of 1656 southern stars,including 1211 that were previously unmeasured, drown from the NLTTproper-motion catalog. The catalog is shown to be a rich source ofsubdwarfs. The normalized ultraviolet excess delta (U - B)0.6,photometric parallax, and interstellar reddening are calculated for eachstar when possible. Photometric parallaxes are compared withtrigonometric parallaxes from the literature. It is found that theformer do not have systematic errors greater than about 25 percent. Inagreement with other studies, the bluest subdwarfs are found at B - V =0.35. The selection of the program stars on the basis of large reducedproper motions restricted subgiant contamination of the sample to about5 percent and increased the discovery fraction of halo stars relative todisk stars. The claim is made here that the sample can be used toinvestigate the abundance distribution of the halo. The sample includesstars with ultraviolet excesses characteristic of disk abundances butwith velocities up to 150 km/s. These are believed to be stars that,quite expectedly, reside in the high-velocity tail of the disk velocitydistribution.

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观测天体数据

星座:人馬座
右阿森松:20h27m13.68s
赤纬:-39°13'23.7"
视星:9.874
右阿森松适当运动:123.8
赤纬适当运动:-126.7
B-T magnitude:10.623
V-T magnitude:9.936

目录:
适当名称   (Edit)
HD 1989HD 194477
TYCHO-2 2000TYC 7949-435-1
USNO-A2.0USNO-A2 0450-38910097
HIPHIP 100874

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