Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1300b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Sept. 1984, p. 1300-1309.
Astronomy and Astrophysics
Astronomy
62
Disk Galaxies, Luminosity, Metallicity, Galactic Clusters, Galactic Evolution, Near Infrared Radiation
Scientific paper
Near-infrared colors have been measured for a sample of 31 late-type galaxies in the Pegasus I and Pisces clusters; system luminosities in the sample cover the range of M(H) between -19 and -23.5. The color index (J - K) correlates strongly with the absolute H magnitude; lower-luminosity systems have bluer colors. These observations are consistent with the assumption that the mean metal abundance of the old disk population decreases systematically with luminosity. The systematic variation (B - H) with absolute H magnitude reported recently by Tully et al. (1982) derives in part from this proposed systematic change of metallicity with luminosity. However, a relative increase in the number of newly formed stars and/or a systematic smaller age for lower-luminosity disks must still be posited in order to fully explain the observed (B - H), H relation.
Bothun Gragory D.
Romanishin William
Strom Karen M.
Strom Stephen E.
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