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HD 156746


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The nature of the Yale Common Proper Motion groups of stars
Attention is given to a large group of approximately 90 stars, twogroups of 20-30 stars, and 12 groups of a few stars each, taken from DDOsystem image tube spectral classification and intermediate bandphotometry for the Yale Common Proper Motion groups of 180 southernstars. Spectroscopic and photometric analyses of these groups haveindicated a very scattered Pop I main sequence in their color-magnitudediagrams. Distance moduli of 5 or less were derived from the averagespectroscopic parallaxes, in keeping with the proper motion amplitude of0.1 arcsec/year. The main sequence of each group shows scatter whenplotted in an HR diagram, indicating that they are probably nothomogeneous groups of stars sharing common physical origins.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Sunak
Sað Açýklýk:17h21m50.92s
Yükselim:-49°17'06.7"
Görünürdeki Parlaklýk:8.904
Uzaklýk:96.432 parsek
özdevim Sað Açýklýk:26
özdevim Yükselim:-126.6
B-T magnitude:9.6
V-T magnitude:8.962

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 156746
TYCHO-2 2000TYC 8349-324-1
USNO-A2.0USNO-A2 0375-31218445
HIPHIP 84956

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