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Astron. Astrophys. 335, 287-291 (1998)

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An ISO view on interstellar dust heated by red giant stars *

T. Le Bertre 1, G. Lagache 2, N. Mauron 3, F. Boulanger 2, F.X. Désert 2, N. Epchtein 1 and P. Le Sidaner 1

1 Observatoire de Paris, 61 av. de l'Observatoire, F-75014 Paris, France
2 Institut d'Astrophysique Spatiale, Bat. 121, Université Paris Sud, F-91405 Orsay Cedex, France
3 ISTEEM, CNRS, Université de Montpellier II, cc072 Place Eugène Bataillon, F-34095 Montpellier Cedex 05, France

Received 5 January 1998 / Accepted 12 March 1998

Abstract

In order to study the structure and emission of the diffuse interstellar medium when it is heated by red giant stars, we have obtained ISOPHOT maps centered at proximity of a sample of such objects. The maps are 7x7 with a pixel size of 45, and were made at 60 and 90 µm. Here we present the preliminary results of this program, based on data from 11 fields recently achieved by ISO. The maps have been centered at 4.7 from the star but do not contain it to avoid saturation. In 7 cases out of 11 we observe an infrared emission with a gradient toward the star. This effect is most probably due to radiative heating of grains which closely surround the red giant, and not to foreground or background matter. The emission is structured at the level of the map pixel, i.e. 45, which corresponds to typical linear sizes of [FORMULA] 0.1-0.3 pc.

Key words: stars: individual: R Aqr – dust, extinction – ISM: general – infrared: ISM: continuum

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA

Send offprint requests to: T. Le Bertre, (lebertre@obspm.fr)

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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998

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