Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..881e&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, May 1, 1978, p. 881-892.
Astronomy and Astrophysics
Astrophysics
44
Abundance, Astronomical Photometry, Late Stars, Star Clusters, Stellar Luminosity, Binary Stars, Calibrating, Globular Clusters, Indexes (Ratios), Stellar Spectrophotometry
Scientific paper
Additional data for several stellar groups and clusters are used to improve a previously determined provisional relation between M1 photometric index and the parameter /Fe/H/(solar) as well as to test the usefulness of the C1 photometric index for luminosity determinations. The data are for 43 members of the Wolf 630 group, 14 members of the 61 Cygni group, 30 members of the Arcturus group, 14 members of Kapteyn's star groups, and various members of the Hyades, 47 Tuc, NGC2420, Omega Cen, and an anonymous group of subdwarfs. It is found that in general the values of C1 only confirm a giant or dwarf classification without yielding accurate luminosities and that the main contribution of C1 for disk objects is in isolating peculiar stars. The results also indicate that there is a luminosity effect in M1 for the strongest-lined stars and that the values of M1 become distorted, probably by the presence of TiO, for R-I larger than about +0.5 magnitude. An array for interpolating /FE/H/(solar) from (R-I, M1) is constructed by adopting mean values of /Fe/H/(solar) equal to +0.1,-0.35, -0.6, and -1.8 for the Hyades, Wolf 630, Arcturus, and Kapteyn's star groups, respectively.
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