LMC SAGE. New variable evolved stars and YSOs


We present initial results and source lists of variable sources in the Large Magellanic Cloud (LMC) for which we detect thermal infrared variability from the Surveying the Agents of a Galaxy's Evolution (SAGE) survey, which had two epochs of photometry separated by 3 months. The SAGE survey mapped a 7{deg}x7{deg} region of the LMC using the Infrared Array Camera (IRAC) and the MIPS instruments on board Spitzer. Variable sources are identified using a combination of the IRAC 3.6, 4.5, 5.8, 8.0um bands and the MIPS 24um bands. An error-weighted flux difference between the two epochs is used to assess the variability. Of the ~3 million sources detected at both epochs, we find ~2000 variable sources for which we provide electronic catalogs. Most of the variable sources can be classified as asymptotic giant branch (AGB) stars. A large fraction (>66%) of the extreme AGB stars are variable and only smaller fractions of carbon-rich (6.1%) and oxygen-rich (2.0%) stars are detected as variable sources. We also detect a population of variable young stellar object candidates.

Cone search capability for table J/AJ/137/3139/table2 (*Properties of the 1967 SAGE Variables)

DOI http://doi.org/10.26093/cds/vizier.51373139
Source https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/137/3139
Related Identifier https://ui.adsabs.harvard.edu/abs/2009AJ....137.3139V
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/137/3139
Creator Vijh U.P.; Meixner M.; Babler B.; Block M.; Bracker S.; Engelbracht C.W.; For B.; Gordon K.; Hora J.; Indebetouw R.; Leitherer C.; Meade M.; Misselt K.; Sewilo M.; Srinivasan S.; Whitney B.
Publisher CDS
Contributor International Virtual Observatory Alliance (IVOA)
Publication Year 2011
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Resource Type Service
Discipline Astrophysics and Astronomy; Cosmology; Galactic and extragalactic Astronomy; Natural Sciences; Observational Astronomy; Physics