Cousins VRI standard stars in the M 67 dipper asterism

Details Cousins VRI standard stars in the M 67 dipper asterism Cousins VRI standard stars in the M 67 dipper asterism

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1004j&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Sept. 1990, p. 1004-1017. Research supported by Br

Economy

40

Charge Coupled Devices, Open Clusters, Stellar Spectrophotometry, Reference Stars, Stellar Color, Stellar Luminosity, Stellar Magnitude

Scientific paper

Cousins VRI data for 19 standard stars in the M 67 dipper asterism are presented. With one exception, the values of sigma per mean for these data are lsss than 10 mmag. Because these stars are close together in the sky, they can be used with economy of effort in standardizing CCD images. New Cousins VRI photometry is reported for 23 M 67 stars. For 22 additional cluster stars, new V magnitudes are reported. It is found that some published V data for the Hyades and M 67 must be corrected by small amounts to recover the Landolt (1983) zero point. In addition, faint-star M 67 measurements by Eggen and Sandage (1964) display scatter which is not easily interpreted. The same is true for the (largely) bright-star M 67 data of Johnson and Sandage (1955). The photomultiplier colors of Janes and Smith (1984) and the CCD data of Schild (1983, 1985) are also considered.

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