UBV observations of the open cluster M25

Details UBV observations of the open cluster M25 UBV observations of the open cluster M25

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1174v&link_type=abstract

Astronomical Journal, vol. 83, Oct. 1978, p. 1174-1178. Research supported by the National Research Council

Astronomy and Astrophysics

Astronomy

8

Open Clusters, Stellar Spectrophotometry, Ubv Spectra, Astronomical Catalogs, Astronomical Maps, Electrophotometers, Main Sequence Stars

Scientific paper

The photoelectric calibration in the moderately young open cluster M25, which contains the Cepheid U Sgr, is extended on the basis of UBV observations of 12 additional photoelectric standards with V magnitudes ranging from 14.8 to 16.3. A mean B-V color excess of 0.51 + or - 0.1 (m.e.) is obtained for 42 probable main-sequence stars within 5.0 arcmin of the adopted cluster center. It is shown that a distance modulus of 10.7 and a U-B color excess of 0.37 give a reasonable fit to Schmidt-Kaler's (1965) age-zero relation between absolute visual magnitude and U-B, with the corresponding true distance modulus being around 9.0 for R = 3.3.

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