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HD 207131


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Photoelectric Vilnius Photometry of Hipparcos Turn-Off Region Stars
Seven-color photometry in the Vilnius system and photometricclassification in terms of spectral type, absolute magnitude andmetallicity are presented for 145 Hipparcos stars of the turn-offregion, most of which have parallaxes determined to an accuracy of atleast 15%. The stars selected for the observing program included thoseidentified kinematically as intermediate between the thin disk and halo,plus a number of weak-lined stars discovered previously from objectiveprism surveys. The metallicity distribution we find for a kinematicallydefined sample of possible members of the thick disk has a meanabundance [Fe/H]= --0.3 dex and a dispersion of 0.3 dex. Our data seemto suggest a large age for this intermediate population.

List of 333 variable, microvariable or suspected variable stars detected in the Geneva photometry
A list is presented of 333 stars, excluded from the GCVS and itssupplements, whose probability of variability ranges from high tocertain. The standard deviations observed in the V magnitude togetherwith the known spectral types, however, only allow speculation as to thetype of variable in question pending supplementary observations whichreveal the individual characteristics of these stars.

A Search for Metal-Deficient Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970ApJS...22..117B&db_key=AST

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Observation and Astrometry data

Constellation:Cygnus
Right ascension:21h45m11.36s
Declination:+54°30'32.9"
Apparent magnitude:8.889
Distance:215.517 parsecs
Proper motion RA:-2.9
Proper motion Dec:-2.4
B-T magnitude:9.395
V-T magnitude:8.931

Catalogs and designations:
Proper Names
HD 1989HD 207131
TYCHO-2 2000TYC 3971-1834-1
USNO-A2.0USNO-A2 1425-12287351
HIPHIP 107396

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