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HD 172850


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Photometric Investigation of the Galaxy in the Direction of Serpens Cauda. A Catalog of Extinctions and Distances
A catalog of spectral types, color excesses, interstellar extinctionsand distances of 402 stars located in the Serpens Cauda dark cloudcomplex and the new results of photoelectric photometry in the Vilniussystem of 56 fainter stars in the same area are presented.

The southern Vilnius photometric system. I - Transformation to the standard system
This paper is the first in a series on the extension of the Vilniusphotometric system to the southern hemisphere. Observations of a commonset of 73 stars measured in both hemispheres are described and ananalysis of the differences is given.

UVBY H-beta photometry of UV-bright stars
uvby H-beta photometry is presented for 90 stars taken from an earlyversion of the Carnochan and Wilson (1983) catalogue of stars that havevery negative UV colors. Two have definite UV excesses (HD 36629, and HD81307). Four early-B stars have UV colors too positive for their visibleclassification, and beta-indices that indicate higher luminosities thanappear possible on galactic distribution grounds. Six late-B starsappear to have discordant flux distributions for which there are noobvious explanations. It is suggested that the high population ofsubluminous stars derived by Carnochan and Wilson is the product of thestatistical treatment used and the extreme patchiness in theinterstellar absorption, which gives rise to large numbers oflittle-reddened stars.

Photometry and a Preliminary Analysis of the beta-Lyrae like System HD 173198
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观测天体数据

星座:天鷹座
右阿森松:18h42m29.90s
赤纬:-01°18'21.4"
视星:7.756
距离:217.865 天文距离
右阿森松适当运动:7.9
赤纬适当运动:0.9
B-T magnitude:7.758
V-T magnitude:7.757

目录:
适当名称   (Edit)
HD 1989HD 172850
TYCHO-2 2000TYC 5113-1106-1
USNO-A2.0USNO-A2 0825-12681845
HIPHIP 91743

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