Abstract

We present a possible interpretation for the increase of the angular diameter of the supergiants alpha Ori (M 1-2 la-lbe) and a Her (M 5 Ib-II) from the K band to the 11 mum region and the high-resolution 11 mum spectra without any salient spectral features revealed by Weiner et a]. (2003b). The angular diameters as well as the high-resolution spectra of alpha Ori and alpha Her obtained in the 11 mum region can be reproduced by a warm water vapor envelope, whose presence in alpha Ori was revealed by Tsuji (2000a) based on the reanalysis of the near-infrared data obtained with the Stratoscope II. While prominent absorption due to H2O can be expected from such a dense, warm water vapor envelope, the absorption lines can be filled in by emission from the extended part of the envelope. This effect leads to a significant weakening of the H2O lines in the 11 mum region, and makes the observed spectra appear to be rather featureless and continuum-like. However, the emission due to H2O lines from the extended envelope leads to an increase of the apparent size in this spectral region. The observed angular diameter and the high resolution spectra of alpha Ori and alpha Her in the 11 mum region can be best interpreted by the water vapor envelope extending to 1.4-1.5 R-star, with a temperature of similar to2000 K and a column density of H2O of the order of 10(20) cm(-2).