Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1662
Title: NGC 146: a young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars
Authors: Subramaniam, A
Sahu, D. K
Sagar, R
Vijitha, P
Keywords: Galaxy: open cluster and associations;individual: NGC 146 -- stars: emission-line;Be -- stars: Hertzsprung-Russell (HR) and C-M diagrams -- stars
Issue Date: Sep-2005
Publisher: EDP Sciences
Citation: Astronomy & Astrophysics, Vol. 440, pp. 511 - 522
Abstract: We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146. UBV photometry of 434 stars were used to estimate the E(B-V) reddening of 0.55 $\pm$ 0.04 mag and BV photometry of 976 stars were used to estimate a distance modulus of (m-M)0 = 12.7 $\pm$ 0.2 mag, corresponding to a distance of 3470 +335-305 pc. We estimated 10-16 Myr as the turn-off age for the upper main sequence of the cluster using isochrones and synthetic colour magnitude diagrams. We identified two B type stars with H$_\alpha$ in emission and located on the MS using slit-less spectra. A higher resolution spectrum of the brighter Be star indicated the presence of a number of emission lines, with some lines showing the signature of gas infall. This star was found to be located in the region of Herbig Ae/Be stars in the (J-H) vs. (H-K) colour-colour diagram. Thus, we identify this star as a Herbig Be star. On the other hand, 54 stars were found to show near infrared excess, of which 17 were found to be located in the region of Herbig Ae/Be stars and 18 stars were found to be located in the region of Be stars in the NIR colour-colour diagram. Thus NGC 146 is a young cluster with a large number of intermediate mass pre-main sequence stars. The turn-on age of the cluster is found to be ~3 Myr. Though NGC 146 shows an older turn off, the bulk of stars in this cluster seems to belong to the younger population of 3 Myr.
URI: http://hdl.handle.net/2248/1662
???metadata.dc.relation.uri???: http://arxiv.org/abs/astro-ph/0505314
http://dx.doi.org/10.1051/0004-6361:20052683
Appears in Collections:Publications based on data from IAO, Hanle
IIAP Publications

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