| Title | The Distance to M31 from Infrared Photometry of Its Cepheids |
| Authors | Welch, Douglas L.; McAlary, Christopher W.; McLaren, Robert A.; Madore, Barry F. |
| Bibcode | 1986ApJ...305..583W Search ADS ↗ |
| Abstract | 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. |
| Objects | 82 Objects Search NED ↙ |
