Variable Sources in Large Magellanic Cloud using the SAGE Survey

Details Variable Sources in Large Magellanic Cloud using the SAGE Survey Variable Sources in Large Magellanic Cloud using the SAGE Survey

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916006v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #160.06; Bulletin of the American Astronomical Society,

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Scientific paper

We will present results on the population of variable sources in the Large Magellanic Cloud (LMC) detected in the Spitzer Space Telescope (SST) SAGE (Surveying the Agents of a Galaxy's Evolution) survey. The SAGE data consists of 2 epoch photometry, 3 months apart using the IRAC (3.6, 4.5, 5.8 and 8.0 μm) and MIPS (24, 70 and 160 μm) instruments on board the SST. We define a variability index based on the difference of the epoch 1 and 2 fluxes weighted by their combined errors. Stars on the upper asymptotic giant branch (AGB) are known to be pulsating with large amplitudes and long periods based on optical studies. Some classes of YSOs are also expected to be variable. We classify the SAGE variable sources based on their colors and magnitudes. We investigate if variability is correlated with other properties such as the bolometric luminosity and in the case of AGB stars, infrared excess emission/mass-loss rate. Different classes of AGB stars are known to have different luminosity-period relations. We explore if the variability index in the SAGE data can also trace these classifications.
The SAGE Project is supported by NASA/Spitzer grant 1275598 and NASA NAG5-12595.

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