The distance to M31 from infrared photometry of its Cepheids

Details The distance to M31 from infrared photometry of its Cepheids The distance to M31 from infrared photometry of its Cepheids

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..583w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 15, 1986, p. 583-590.

Astronomy and Astrophysics

Astrophysics

107

Andromeda Galaxy, Astrometry, Cepheid Variables, Infrared Photometry, Stellar Evolution, Stellar Luminosity, Distance, Least Squares Method, Light Curve

Scientific paper

The distance to M31 (NGC 224) has been determined by using H (1.65-micron) photometry of seven classical Cepheids in fields III and IV. Identification of contaminated photometry is described. Uncontaminated observations have been reduced to intensity-weighted mean magnitudes. Using the galactic calibration of Welch et al. (1984) and mean H magnitudes of 38 LMC Cepheids, a weighted least-squares solution for the H P-L relation results in an apparent distance modulus of (m - M)H = 24.31 + or - 0.08 mag. Using the best estimate of A(H) = 0.05 + or - 0.02 mag, a true distance modulus of (m - M)0 = 24.26 + or - 0.08 mag is obtained. Astrometry for 82 Cepheids in fields I, II, III, and IV is also presented.

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