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Astron. Astrophys. 339, 159-164 (1998)

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ISO-SWS observations of Herbig Ae/Be stars: HI recombination lines in MWC1080 and CoD -42° 11721 *

M. Benedettini 1, B. Nisini 1, T. Giannini 1, D. Lorenzetti 2, E. Tommasi 3, P. Saraceno 1 and H.A. Smith 4

1 CNR-Istituto di Fisica dello Spazio Interplanetario, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, I-00133 Roma, Italy
2 Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio, Italy
3 ISO Science Operations Centre, Villafranca, P.O. Box 50727, E-28080 Madrid, Spain
4 Harvard - Smithsonian Center for Astrophysics, 60 Garden Street - Cambridge, MA 02138, USA

Received 14 May 1998 / Accepted 3 August 1998

Abstract

ISO-SWS grating spectra are obtained towards the two Herbig Ae/Be stars MWC1080 and CoD [FORMULA] 11721, showing hydrogen recombination lines of the Brackett, Pfund and Humphreys series. The observed line decrements in each spectral series are consistent with emission from ionized winds, as expected from these early-type stars. We compare the observed line emission with a wind model assuming a constant rate of mass flow from the star, which allows to consistently derive mass loss rate and distance of both stars. We also show that the observed decrements can only be explained by assuming a ionization bounded compact regions whose sizes are a few tens of the stellar radii.

Key words: stars: pre-main sequence – circumstellar matter – stars: mass-loss – stars: individual: MWC1080 – stars: individual: CoD -42O 11721 – infrared: stars

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States and with the partecipation of ISAS and NASA

Send offprint requests to: Milena Benedettini, (milena@sirius.ifsi.rm.cnr.it)

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© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998
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