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, ~ 5-24 mag), intermediate-mass objects ( ~ 1.5-3.5 Msun). 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.
Habart E, Testi L, Natta A, Vanzi L (2003). Mid-IR observations of small stellar clusters surrounding Herbig AeBe stars. ASTRONOMY & ASTROPHYSICS, 400, 575-583.
Mid-IR observations of small stellar clusters surrounding Herbig AeBe stars
Testi L;
2003
Abstract
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, ~ 5-24 mag), intermediate-mass objects ( ~ 1.5-3.5 Msun). 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
