Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We present a catalog of 1750 massive stars in the Large Magellanic Cloud,with accurate spectral types compiled from the literature, and a photometriccatalog for a subset of 1268 of these stars, with the goal of exploring theirinfrared properties. The photometric catalog consists of stars with infraredcounterparts in the Spitzer SAGE survey database, for which we present uniformphotometry from 0.3-24 microns in the UBVIJHKs+IRAC+MIPS24 bands. The resultinginfrared color-magnitude diagrams illustrate that the supergiant Be, redsupergiant and luminous blue variable LBV stars are among the brightestinfrared point sources in the Large Magellanic Cloud, due to their intrinsicbrightness, and at longer wavelengths, due to dust. We detect infrared excessesdue to free-free emission among ~900 OB stars, which correlate with luminosityclass. We confirm the presence of dust around 10 supergiant Be stars, findingthe shape of their spectral energy distributions SEDs to be very similar, incontrast to the variety of SED shapes among the spectrally variable LBVs. Thesimilar luminosities of Be supergiants log L-Lo>=4 and the rare, dustyprogenitors of the new class of optical transients e.g. SN 2008S and NGC 300OT, plus the fact that dust is present in both types of objects, suggests acommon origin for them. We find the infrared colors for Wolf-Rayet stars to beindependent of spectral type and their SEDs to be flatter than what modelspredict. The results of this study provide the first comprehensive roadmap forinterpreting luminous, massive, resolved stellar populations in nearby galaxiesat infrared wavelengths.



Author: A. Z. Bonanos, D. L. Massa, M. Sewilo, D. J. Lennon, N. Panagia, L. J. Smith, M. Meixner, B. L. Babler, S. Bracker, M. R. Meade,

Source: https://arxiv.org/







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