IR PHOTOMETRY AND MODELS OF DUST SHELLS FOR TWO RCB STARSстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present JHKLM photometry obtained in 1984-2009 for the RCB stars UV Cas and SU Tau. No major fadings characteristic of RCB stars were detected during the observations of UV Cas, while two events of this kind occurred for SU Tau. The observed flux and color-index variations can be explained with a changing dust concentration in the line of sight, and possibly variations of the stellar temperature. We use the measured fluxes, supplemented with observations in the intermediate IR, to compute spherically symmetric dust-shell models for the stars. The mass-loss rate is estimated to be 1.7 × 10-6 M sun yr-1 for UV Cas and 4.1 × 10-6 M sun yr-1 for SU Tau.