Pulsation and Mass-Loss in Long Period Variables

Details Pulsation and Mass-Loss in Long Period Variables Pulsation and Mass-Loss in Long Period Variables

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2504f&link_type=abstract

American Astronomical Society, AAS Meeting #211, #25.04; Bulletin of the American Astronomical Society, Vol. 39, p.776

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new analysis of the long period variables in the Large Magellanic Cloud from the MACHO Variable Star Catalog. Of our sample of 61,587 evolved stars with non-constant light curves, 80 percent have periodic light curves. We characterize these stars using the multiple periods, harmonics, and mixing terms found in their frequency spectra. Additionally, we use single-epoch 2MASS measurements to construct the average infrared light curve of each of the well-known period-luminosity sequences. We further constrain the mechanism behind the long secondary periods seen in many of these stars, and find that an explanation due to binarity is indeed likely. We describe the characteristic variability at each of the stages of RGB and AGB evolution by comparison with population synthesis models. RGB and early AGB stars vary with either periodic or chaotic pulsations, the latter explain the large number of stars (22 percent of our sample) with periods clearly due to the annual observing cycle on Earth. Stars in the thermally pulsing AGB pulsate periodically with longer periods than those earlier in their evolution, and are also the most likely to undergo heavy mass loss. We also compare the long period variables in the MACHO catalogs of the SMC and the Galactic Bulge with our results.

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