Abstract
view Abstract Citations (48) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Intermediate-band photometry of late-type stars. V. Calibration of indices. Eggen, O. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1978 DOI: 10.1086/156091 Bibcode: 1978ApJ...221..881E Keywords: Abundance; Astronomical Photometry; Late Stars; Star Clusters; Stellar Luminosity; Binary Stars; Calibrating; Globular Clusters; Indexes (Ratios); Stellar Spectrophotometry; Astronomy; Late-Type Stars:Luminosities; Late-Type Stars:Photometry; Photometry:Stellar Groups full text sources ADS | data products SIMBAD (77) GCPD (1) Related Materials (8) Part 1: 1976PASP...88..732E Part 2: 1977ApJ...215..812E Part 3: 1977PASP...89..706E Part 4: 1978ApJS...37..251E Part 6: 1978ApJ...222..191E Part 7: 1978ApJ...222..203E Part 8: 1979ApJ...229..158E Part 9: 1979ApJ...234..168E
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