Are luminous asymptotic giant branch stars all of spectral type MS? - Evidence from spectroscopic and photometric observations of LMC stars

Details Are luminous asymptotic giant branch stars all of spectral type MS? - Evidence from spectroscopic and photometric observations of LMC stars Are luminous asymptotic giant branch stars all of spectral type MS? - Evidence from spectroscopic and photometric observations of LMC stars

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...200...85l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 200, no. 1-2, July 1988, p. 85-98.

Astronomy and Astrophysics

Astrophysics

13

Asymptotic Giant Branch Stars, Infrared Photometry, Magellanic Clouds, Spectral Bands, Stellar Luminosity, Late Stars, Metal Oxides, Milky Way Galaxy, S Stars, Stellar Evolution

Scientific paper

IDS spectra of 49 LMC field stars, previously classified as M stars from objective-prism spectra, 8 red stars in NGC 2100 and one known LMC S star have been obtained. The sample includes luminous supergiants and AGB stars. VRI photometry for a subset of the sample is used for photometric calibration of the IDS spectra. Reddenings of up to E(V-IKC) = 1 mag are found. Absolute bolometric magnitudes are derived. Close examination of the spectra reveals a great number of stars with slightly enhanced ZrO bands. TiO and ZrO indices, A(TiO) and A(ZrO), are measured. A dividing line in the A(TiO), A(ZrO) plane, separating normal M-type stars from stars with enhanced ZrO bands, is adopted and stars falling in the enhanced ZrO region are classified MS. In the region -5 > Mbol ≥ -6.6, 2.0 < (V-IkC)0 < 4.0 no star is found showing a normal M-type spectrum. This region is occupied by MS, S and C stars. In the present sample the MS stars are more luminous than the S stars.

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