Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-30
Mon.Not.Roy.Astron.Soc.370:743-752,2006
Astronomy and Astrophysics
Astrophysics
20 pages, 11 figures, Accepted for publishing in MNRAS on April 19, 2006
Scientific paper
10.1111/j.1365-2966.2006.10481.x
We present a photometric and spectroscopic study of the young open cluster NGC 7419, which is know to host a large number of classical Be stars for reasons not well understood. Based on CCD photometric observations of 327 stars in UBV passbands, we estimated the cluster parameters as, reddening E(B-V) = 1.65 +/- 0.15 mag and distance = 2900 +/- 400 pc. The turn off age of the cluster was estimated as 25 +/- 5 Myr using isochrone fits. UBV data of the stars were combined with JHK data from 2MASS and were used to create the near infrared (NIR) (J-H) vs (H-K) colour-colour diagram. A large fraction of stars (42%) was found to have NIR excess and their location in the diagram was used to identify them as intermediate mass pre-MS stars. The isochrone fits to pre-MS stars in the optical colour-magnitude diagram showed that the turn-on age of the cluster is 0.3 - 3 Myr. This indicates that there has been a recent episode of star formation in the vicinity of the cluster. Slit-less spectra were used to identify 27 stars which showed H-alpha in emission in the field of the cluster, of which 6 are new identifications. All these stars were found to show NIR excess and located closer to the region populated by Herbig Ae/Be stars in the (J-H) vs (H-K) diagram. Slit spectra of 25 stars were obtained in the region 3700A - 9000A. The spectral features were found to be very similar to those of Herbig Be stars. Those stars were found to be more reddened than the main sequence stars by 0.4 mag on an average. Thus the emission line stars found in this cluster are more similar to the Herbig Be type stars where the circumstellar material is the remnant of the accretion disk.
Bhatt Bhuwan Chandra
Mathew Blesson
Ramya S.
Subramaniam Annapurni
No associations
LandOfFree
NGC 7419: A young open cluster with a number of very young intermediate mass pre-MS stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with NGC 7419: A young open cluster with a number of very young intermediate mass pre-MS stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NGC 7419: A young open cluster with a number of very young intermediate mass pre-MS stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-47523