A comparison between Washington and DDO photometry of field red giants

Details A comparison between Washington and DDO photometry of field red giants A comparison between Washington and DDO photometry of field red giants

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..231s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Feb. 1986, p. 231-237. Research supported by the Sm

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9

Astronomical Photometry, Red Giant Stars, Color-Magnitude Diagram, Data Correlation, Metallicity, Stellar Color

Scientific paper

Washington CMT1T2 photometry of a sample of field red giants is compared with DDO colors obtained by McClure (1970) and Janes (1975) to determine the relative sensitivities of the metallicity indices of the two systems. Washington line-blanketing indices delta(M-T1) and delta(C-M) were derived, and found to correlate very well with each other, in addition to correlating quite well with the DDO metallicity index. Furthermore, any N/A or C/A abundance variations which may exist among the present sample of old disk giants do not appear to significantly effect the delta(C-M) index. The study indicates that delta(C-M) should provide a useful photometric metal abundance indicator, and is capable of providing estimates accurate to about + or - 0.2 dex over the Fe/H abundance range of +0.4 to -0.8.

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