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Astron. Astrophys. 361, 258-264 (2000)

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Mid infrared emission of nearby Herbig Ae/Be stars *

R. Siebenmorgen 1, T. Prusti 2, A. Natta 3 and T.G. Müller 2

1 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
2 ISO Data Centre, Astrophysics Division, ESA, Villafranca del Castillo, P.O. Box 50727, 28080 Madrid, Spain
3 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy

Received 8 May 2000 / Accepted 21 June 2000


We present mid IR spectro-photometric imaging of a sample of eight nearby ([FORMULA] pc) Herbig Ae/Be stars. The spectra are dominated by photospheric emission (HR6000), featureless infrared excess emission (T Cha), broad silicate emission feature (HR5999) and the infrared emission bands (HD 97048, HD 97300, TY CrA, HD 176386). The spectrum of HD179218 shows both silicate emission and infrared emission bands (IEB). All stars of our sample where the spectrum is entirely dominated by IEB have an extended emission on scales of a few thousand AU ([FORMULA]). We verify the derived source extension found with ISOCAM by multi-aperture photometry with ISOPHT and compare our ISOCAM spectral photometry with ISOSWS spectra.

Key words: stars: circumstellar matter – stars: pre-main sequence – ISM: lines and bands

* 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) with the participation of ISAS and NASA.

Send offprint requests to: R. Siebenmorgen (rsiebenm@eso.org)

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© European Southern Observatory (ESO) 2000

Online publication: September 5, 2000