ON THE NATURE OF THE STELLAR CLUSTER AT THE ROSETTE GMC CO PEAK

Citation
Mm. Hanson et al., ON THE NATURE OF THE STELLAR CLUSTER AT THE ROSETTE GMC CO PEAK, Astronomy and astrophysics, 273(2), 1993, pp. 44-46
Citations number
12
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046361
Volume
273
Issue
2
Year of publication
1993
Pages
44 - 46
Database
ISI
SICI code
0004-6361(1993)273:2<44:OTNOTS>2.0.ZU;2-7
Abstract
K'-band imaging of the Rosette giant molecular cloud CO emission peak reveals the presence of a newly discovered small cluster of stars, coi ncident with the IRAS source 06314+0427 (Block et al. 1993). We have o btained a high-resolution K-band spectrum of the brightest member of t he cluster (dubbed BG/IRS1). The Brgamma 2.166 mum line shows a double peaked emission, indicative of a hot star with a disklike circumstell ar geometry. We have obtained JHK photometry, which has allowed us to determine the near-IR extinction toward the cluster (A(K) = 1.m5 +/- . 5). Assuming a distance of 1600 pc for the cluster, we show that at le ast two of the stars appear to be well above the ZAMS, based upon thei r inferred spectral types and MK magnitudes. From this we conclude tha t we are seeing a pre-main-sequence cluster of stars.