On the absolute magnitudes of RR Lyrae stars

Details On the absolute magnitudes of RR Lyrae stars On the absolute magnitudes of RR Lyrae stars

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307l...9b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. L9-L13.

Astronomy and Astrophysics

Astrophysics

66

Astronomical Photometry, Stellar Magnitude, Variable Stars, Approximation, Astronomical Catalogs, Light Curve, Luminous Intensity

Scientific paper

The photometric data base used by Hawley and colleagues in 1986 to determine a mean absolute magnitude for RR Lyrae stars has been examined for systematic errors. Both the magnitudes published by Fitch et al. in 1966 and Clube and Dawe in 1980 for RR Lyrae stars are shown to differ systematically from intensity mean magnitudes. On the basis of new photometry, better relations are determined for inferring intensity mean magnitudes from partial light curves, using both the Fitch et al. and Clube and Dawe methods. In addition, it is shown that the Fitch et al. photometry requires magnitude-dependent corrections. After correcting the data base for the above effects, the statistical analysis was repeated to determine the mean absolute magnitude for 142 RRab stars with the result +0.68 + or - 0.14 mag. This is 0.08 mag brighter than the previous determination by Hawley et al.

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