The near-infrared NA I doublet in giant elliptical galaxies

Details The near-infrared NA I doublet in giant elliptical galaxies The near-infrared NA I doublet in giant elliptical galaxies

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...211l..12x&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 211, no. 1, Feb. 1989, p. L12-L14.

Astronomy and Astrophysics

Astrophysics

11

Dwarf Stars, Elliptical Galaxies, Near Infrared Radiation, Sodium, Absorption Spectra, G Stars, K Stars, M Stars, Metallicity, Spectral Bands

Scientific paper

It is shown that the absorption feature observed in the spectrum of giant elliptical galaxies at about 8200 A is due not only to the Na I near infrared doublet, but also to a blend of metallic lines (Fe I, V I, Zr I, Mg I) and to weak TiO bands at about 8200 A. The identification of this feature with the Na I doublet has led to the conclusion that the spectra of elliptical galaxies contain a significant late M dwarf contribution, in contradiction with the observation of the Wing-Ford band, the CO band at 2.3 microns, and the near-infrared Ca II triplet, which all point to a giant-dominated light. This apparent difficulty is now resolved.

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