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HD 197031


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Population studies. I - The Bidelman-MacConnell 'weak-metal' stars
BRVI and DDO photometry are presented for 309 Bidelman-MacConnell'weak-metal' stars. Radial velocities are calculated for most of thestars having Fe/H abundances of no more than -0.8. The photometricobservations were carried out using the 0.6-meter and 1.0-metertelescopes of the Siding Spring Observatory. Photometric taxonomy wasused to classify the stars as dwarfs, giants, red-horizontal branchstars, and ultraviolet-bright stars, respectively. It is found that 35percent of the stars are giants; 50 percent are dwarfs; and 5 percentbelong to the red-horizontal branch group. The role of selection effectsin investigations of the formation of the Galaxy is discussed on thebasis of the photometric observations and the observational constraintsproposed by Eggen et al. (1962).

Photometry of Metal Weak Stars
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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Mikroskop
Sað Açýklýk:20h42m30.07s
Yükselim:-41°13'34.3"
Görünürdeki Parlaklýk:10.242
özdevim Sað Açýklýk:14.4
özdevim Yükselim:27.8
B-T magnitude:10.866
V-T magnitude:10.294

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 197031
TYCHO-2 2000TYC 7967-950-1
USNO-A2.0USNO-A2 0450-39132191
HIPHIP 102204

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