Long-period variables in the Large Magellanic Cloud. II - Infrared photometry, spectral classification, AGB evolution, and spatial distribution

Details Long-period variables in the Large Magellanic Cloud. II - Infrared photometry, spectral classification, AGB evolution, and spatial distribution Long-period variables in the Large Magellanic Cloud. II - Infrared photometry, spectral classification, AGB evolution, and spatial distribution

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..784h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 784-816.

Astronomy and Astrophysics

Astronomy

166

Asymptotic Giant Branch Stars, Infrared Photometry, Magellanic Clouds, Mira Variables, Spatial Distribution, Stellar Evolution, Color-Magnitude Diagram, Density Distribution, Stellar Luminosity, Stellar Mass, Stellar Spectrophotometry

Scientific paper

Infrared JHK photometry and visual spectra have been obtained for a large sample of long-period variables (LPVs) in the Large Magellanic Cloud (LMC). Various aspects of the asymptotic giant branch (AGB) evolution of LPVs are discussed using these data. The birth/death rate of LPVs of different ages in the LMC is compared with the birth rates of appropriate samples of planetary nebulas, clump stars, Cepheids, and OH/IR stars. It appears that there are much fewer large-amplitude LPVs per unit galactic stellar mass in the LMC than in the Galaxy. It is suggested that this may be due to the fact that the evolved intermediate-age AGB stars in the LMC often turn into carbon stars, which tend to have smaller pulsation amplitudes than M stars. There is also a major discrepancy between the number of LPVs in the LMC (and in the Galaxy) and the number predicted by the theories of AGB evolution, pulsation, and mass loss. A distance modulus to the LMC of 18.66 + or - 0.05 is derived by comparing the LMC LPVs with P about 200 days with the 47 Tucanae Mira variables in the (K, log P) plane.

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