Two micron spectroscopy of Galactic and M31 globular clusters

Details Two micron spectroscopy of Galactic and M31 globular clusters Two micron spectroscopy of Galactic and M31 globular clusters

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351l..37d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 351, March 10, 1990, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

18

Andromeda Galaxy, Astronomical Spectroscopy, Globular Clusters, Infrared Spectra, Spectrum Analysis, Absorption Spectra, Carbon Monoxide, Cyanogen, Near Infrared Radiation, Peculiar Stars, Red Giant Stars

Scientific paper

Near-infrared spectroscopic observations, covering the wavelength intervals 1.5-1.8 microns and 2.0-2.4 microns, have been obtained of a small sample of Galactic and luminous M31 globular clusters. The strongest features in the spectra are absorption bands of CO and CN. The Delta-v = 2 CO bands in the mean M31 cluster spectrum are stronger than those in the Galactic metal-rich cluster NGC 6316, but similar in strength to those in NGC 6304. However, the CN bands in the mean M31 spectrum appear to be substantially stronger than those in Galactic globular clusters. Consequently, it is concluded that the near-IR properties of at least some luminous M31 clusters are dominated by spectroscopically peculiar red giants.

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