Spectroscopy of long-period variables in M33

Details Spectroscopy of long-period variables in M33 Spectroscopy of long-period variables in M33

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..376g&link_type=abstract

Publications of the Astronomical Society of the Pacific, vol. 106, no. 698, p. 376-381

Astronomy and Astrophysics

Astronomy

2

Infrared Spectra, M Stars, Stellar Spectra, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Visible Spectrum, Carbon Stars, Near Infrared Radiation, Spiral Galaxies, Star Distribution, Stellar Evolution

Scientific paper

Spectrophotometry of 36 long-period variable stars in M33 is presented. Most of them show strong TiO bands. These spectra together with published photometry indicate that the red variables exceeding 5 x 104 solar luminosity are M supergiants, evolved from young massive stars which are prominent in this galaxy. A small number of lower-luminosity stars are present in this sample. These are asymptotic-giant-branch stars. We identify two of them as carbon stars. There are no strong S stars.

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