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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: | 헤르쿨레스자리 |
| 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:
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