CCD UVBY photometry in M67

Details CCD UVBY photometry in M67 CCD UVBY photometry in M67

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..647a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, March 1987, p. 647-653.

Astronomy and Astrophysics

Astronomy

30

Astronomical Photometry, Charge Coupled Devices, Star Clusters, Ubv Spectra, Cool Stars, Distance, Metallicity, Stellar Luminosity, Stellar Magnitude

Scientific paper

Photometry on the uvby system for 27 members in two fields in M67 has been obtained using the CTIO 4 m PFCCD system. Instrumental indices have been calibrated to the standard Strömgren system in part by comparison to recent photoelectric observations in M67 by Nissen, Twarog, and Crawford (1987). While not independent of their results, the present study derives values of -0.07±0.15 for the metallicity [Fe/H] of the cluster, and a true distance modulus of 9.53±0.14 (s.e.m.) for an adopted reddening of E(b-y) = 0.023. The luminosity dependence of the metallicity parameter δm1 and of the absolute-magnitude calibration are discussed.

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