uvbyCa H beta CCD Photometry of Clusters. VII. The Intermediate-Age Anticenter Cluster Melotte 71
| dc.creator | Twarog, B. A. | |
| dc.creator | Corder, S. | |
| dc.creator | Anthony-Twarog, B. J. | |
| dc.date | 2006-04-05 | |
| dc.date.accessioned | 2026-07-07T11:25:27Z | |
| dc.date.available | 2026-07-07T11:25:27Z | |
| dc.description | CCD photometry on the intermediate-band uvbyCa H beta system is presented for the anticenter, intermediate-age open cluster, Melotte 71. Restricting the data to probable single members of the cluster using the color-magnitude diagram and the photometric indices alone generates a sample of 48 F dwarfs on the unevolved main sequence. The average E(b-y) = 0.148 +/- 0.003 (s.e.m.) or E(B-V) = 0.202 +/- 0.004 (s.e.m.), where the errors refer to internal errors alone. With this reddening, [Fe/H] is derived from both m1 and hk, using H beta and b-y as the temperature index, with excellent agreement among the four approaches and a final weighted average of [Fe/H] = -0.17 +/- 0.02 (s.e.m.) for the cluster, on a scale where the Hyades has [Fe/H] = +0.12. When adjusted for the higher reddening estimate, the previous metallicity estimates from Washington photometry and from spectroscopy are now in agreement with the intermediate-band result. From comparisons to isochrones of appropriate metallicity, the cluster age and distance are determined as 0.9 +/- 0.1 Gyr and (m-M) = 12.2 +/- 0.1 or (m-M)_0 = 11.6 +/- 0.1. At this distance from the sun, Mel 71 has a galactocentric distance of 10.0 kpc on a scale where the sun is 8.5 kpc from the galactic center. Based upon its age, distance, and elemental abundances, Mel 71 appears to be a less populous analog to NGC 3960. | |
| dc.description | Accepted for Astronomical Journal. 38 page latex file includes 11 figures and short version of data table. Full table will appear in online AJ or may be requested from authors | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0604112 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0604112 | |
| dc.identifier | Astron.J.132:299-309,2006 | |
| dc.identifier | doi:10.1086/504920 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195514 | |
| dc.subject | Astrophysics | |
| dc.title | uvbyCa H beta CCD Photometry of Clusters. VII. The Intermediate-Age Anticenter Cluster Melotte 71 | |
| dc.type | text |