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HD 3131


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Intermediate band photometry of late-type stars. II - Some stellar groups
Observations on the (R, I) system and a modified Stromgren system ofmembers of six stellar groups are used to demonstrate the chemicalhomogeneity of some 70% or 80% of the members assigned to the groups onthe basis of kinematics. The groups discussed are the Hyades, Wolf 630,Arcturus, Groombridge 1830, and Kapteyn's Star Groups as well as ananonymous group of a half dozen subdwarfs with (U, V) near (-150, -320)km/s. Standards for a previously described photometric system areextended, and additional F- and G-type standards for the (R, I) systemare presented. A simple relation is derived for computing the Fe/Habundance ratio for most stars in the corrected (R-I) interval from +0.2to +0.45 magnitude.

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Observation and Astrometry data

Constellation:うお座
Right ascension:00h34m41.29s
Declination:+11°08'05.2"
Apparent magnitude:8.183
Distance:61.312 parsecs
Proper motion RA:33.1
Proper motion Dec:-20.3
B-T magnitude:8.771
V-T magnitude:8.232

Catalogs and designations:
Proper Names
HD 1989HD 3131
TYCHO-2 2000TYC 606-1216-1
USNO-A2.0USNO-A2 0975-00121867
HIPHIP 2724

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