EDP Sciences
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Volume 400, Number 2, March III 2003
Page(s) 575 - 583
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021833

A&A 400, 575-583 (2003)
DOI: 10.1051/0004-6361:20021833

Mid-IR observations of small stellar clusters surrounding Herbig AeBe stars

E. Habart1, L Testi1, A. Natta1 and L. Vanzi2

1  Osservatorio Astrofisico di Arcetri, INAF, Largo E. Fermi 5, 50125 Firenze, Italy
2  European Southern Observatory, Santiago, Chile

(Received 23 September 2002 / Accepted 28 November 2002)

We present TIMMI2 observations at 10  $\mu$m of 12 fields centered on known Herbig AeBe (HAeBe) stars. We detected sources (in addition to the HAeBe star) in five fields, three of which are associated with early B stars. Using complementary near-IR and optical data, we estimate that the detected sources are young, embedded ( AV $\sim 5{-}24$ mag), intermediate-mass objects (~ 1.5-3.5  $M_\odot$). In four objects the 10  $\mu$m emission can be accounted for by a circumstellar disk, while in 2 cases (possibly 3) there is evidence that the objects are still in an earlier stage of evolution (Class I). These results confirm the association of the early B Herbig stars with rather rich clusters, as well as their very young age. If our estimates of the stellar parameters are confirmed, this would be the largest sample so far of embedded, intermediate-mass objects available for further studies.

Key words: stars: formation -- stars: pre-main sequence -- infrared: stars -- open clusters and associations: general -- circumstellar matter

Offprint request: E. Habart, habart@arcetri.astro.it

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