Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.2184e&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 107, no. 6, p. 2184-2210
Astronomy and Astrophysics
Astronomy
8
Abundance, Astronomical Photometry, F Stars, K Stars, Red Giant Stars, Stellar Luminosity, Supergiant Stars, Stellar Composition, Stellar Spectra
Scientific paper
The reddening, luminosity, and heavy element abundance of 250 bright giants and supergiants of type GK are discussed on the basis of 4 color, DDO, RI, and Geneva photometry Bright giants of type GK with age greater than 5 x 108 yr, and of type G0/3 with age greater than 2 x 108 yr, are very scarce in the solar neighborhood. The median space motion vectors of the bright giants and supergiants with well determined space motions are (U, V, W) = (+10.6, -13.2, -7.7) +/- (12.3, 8.8, 8.8) km/s. The M1 index for 4 color photometry, when corrected for luminosity (gravity) effects, is sensitive to heavy element abundance of the GK stars but may not be reliable for those of type G0/3. The available spectroscopic determinations of (Fe/H) give mixed results with the two largest samples being internally consistent but with a large zero-point difference. There is a similar zero-point shift in the peak frequency of the photometrically determined values of P(Fe/H) for the F type and for the GK type stars. There is little evidence for an appreciable galactic, radial gradient in the P(Fe/H) values. A previously noted correlation of the heavy element abundance index, delta M1, with the amplitude defect in the B light curves of Cepheids, FB, and interpretation of the (PLFB) relation as a (PL(Fe/H)) relation needs further investigation in light of the apparent sensitivity of M1 to Fe/H for the F stars (the domain of the Cepheids with P less than 10 d) and lack of this sensitivity for the G0/3 star (domain of the Cepheids with P greater than 10 d).
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