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HD 137757


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Reddening estimation for halo red giants using UVBY photometry
Updated uvby observations for a larger sample of metal-deficient redgiants are presented and combined with a select sample of data from theliterature transformed to a common system. Using the reddening maps ofBurstein & Heiles (1982), new absolute magnitudes, distances,metallicities, and reddenings are derived for each star. Themetallicities are determined with a revised calibration of them1, (b-y) diagram based upon comparison to a complilation ofrecent spectrsoscopic abundances transformed to a common system. Thephotometric abundances agree very well with the spectroscopic; thedispersion among the residuals for 58 giants is +/- 0.16 dex. Thedereddened indices are used to show that for red giants with (Fe/H) lessthan -1.5, there is a well-defined relation in the c0,(b-y)0 diagram which exhibits only a weak dependence uponmetallicity. Use of the standard relations allows one to obtainreddening estimates for normal halo field giants and globular clustersin the appropriate metallicity range.

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Observation and Astrometry data

Constellation:Südliches Dreieck
Right ascension:15h30m54.79s
Declination:-61°40'57.1"
Apparent magnitude:8.22
Distance:250.627 parsecs
Proper motion RA:1.3
Proper motion Dec:-22.8
B-T magnitude:9.566
V-T magnitude:8.332

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 137757
TYCHO-2 2000TYC 9022-1461-1
USNO-A2.0USNO-A2 0225-22971279
HIPHIP 75970

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