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INTERMEDIATE-BAND PHOTOMETRY OF LATE-TYPE STARS

O. J. EGGEN
Publications of the Astronomical Society of the Pacific
Vol. 88, No. 525 (October 1976), pp. 732-737
Stable URL: http://www.jstor.org/stable/40676196
Page Count: 6
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INTERMEDIATE-BAND PHOTOMETRY OF LATE-TYPE STARS
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Abstract

In four-color, intermediate-band photometry of late-type stars, difficulty has been experienced in reproducing the Stromgren system as defined by standard stars published by Crawford and Barnes. The difficulty is believed to be connected with the fact that an international, bulk order for filters has produced a considerably narrower v filter than that used in the original observations of the standard stars. Because of this difficulty a new system has been defined which is characterized by (b—y) = (b—y) Strömgren, M₁ = m₁ (Stromgren) for (b—y) < 0ṃ30 and C₁ (Strömgren) for (b—y) < 0ṃ20. The use of Mi as a metal-abundance parameter is demonstrated with Hyades-cluster and group stars and members of the Arcturus group, as well as with some very metal-weak subdwarfs.

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