IRAS 17393-3004, a late-type supergiant surrounded by a dust shell

Abstract

Infrared observations of IRAS 17393-3004, including a full scan ISOSWS are presented. The ISOSWS spectrum shows two prominent dust emission peaks at lambda 10.4mu m and 17.5 mu m confirming that the source is a luminous star surrounded by a dust shell. The spectrum of the star, deduced from modeling of the radiative transfer through a spherical shell using the DUSTY code (Ivezić et al. 1997), can be explained along with other known properties in terms of an M4 supergiant with OH, SiO and H_2O maser emission and a large mass loss of ~ 10(-4) M_sun yr(-1) . ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) with the participation of ISAS and NASA.