Cold dust in three massive evolved stars in the LMC

Boyer, M. L., Sargent, B., van Loon, J. Th., Srinivasan, S., Clayton, G. C., Kemper, F., Smith, L. J., Matsuura, M., Woods, Paul M., Marengo, M., Meixner, M., Engelbracht, C., Gordon, K. D., Hony, S., Indebetouw, R., Misselt, K., Okumura, K., Panuzzo, P., Riebel, D., Roman-Duval, J., Sauvage, M., & Sloan, G. C.
2010, Astronomy and Astrophysics, 518, L142

Massive evolved stars can produce large amounts of dust, and far-infrared (IR) data are essential for determining the contribution of cold dust to the total dust mass. Using Herschel, we search for cold dust in three very dusty massive evolved stars in the Large Magellanic Cloud: R71 is a luminous blue variable, HD 36402 is a Wolf-Rayet triple system, and IRAS05280-6910 is a red supergiant. We model the spectral energy distributions using radiative transfer codes and find that these three stars have mass-loss rates up to 10-3 M_тКЩ yr-1, suggesting that high-mass stars are important contributors to the life-cycle of dust. We found far-IR excesses in two objects, but these excesses appear to be associated with ISM and star-forming regions. Cold dust (T < 100 K) may thus not be an important contributor to the dust masses of evolved stars. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Table 2 is only available in electronic form at http://www.aanda.org

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