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HD 164825


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A photometric study of BL Herculis
Photometric observations of the prototype variable BL Her are described.The reddening, metallicity, temperature, and surface gravity of the starare determined. A Baade-Wesselink analysis is made to determine theradius and distance to the variable. The mass of the star is determinedto be 0.75 solar, placing it in the range of RR Lyrae variables. Themetallicity of +0.20, however, is greater than that of any known RRLyrae variable.

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Observation and Astrometry data

Constellation:Hercule
Right ascension:18h02m10.03s
Declination:+20°58'21.7"
Apparent magnitude:8.252
Distance:175.747 parsecs
Proper motion RA:1.7
Proper motion Dec:9.2
B-T magnitude:8.464
V-T magnitude:8.27

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 164825
TYCHO-2 2000TYC 1566-236-1
USNO-A2.0USNO-A2 1050-09571848
HIPHIP 88313

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