Astrophys. J., 697, 701-712 (2009/May-3)
Near-infrared spectra of galactic stellar clusters detected on Spitzer/GLIMPSE images.
MESSINEO M., DAVIES B., IVANOV V.D., FIGER D.F., SCHULLER F., HABING H.J., MENTEN K.M. and PETR-GOTZENS M.G.
Abstract (from CDS):
We present near-infrared spectroscopic observations of massive stars in three stellar clusters located in the direction of the inner Galaxy. One of them, the Quartet, is a new discovery while the other two were previously reported as candidate clusters identified on mid-infrared Spitzer images (GLIMPSE20 and GLIMPSE13). Using medium-resolution (R = 900-1320) H and K spectroscopy, we firmly establish the nature of the brightest stars in these clusters, yielding new identifications of an early WC and two Ofpe/WN9 stars in the Quartet and an early WC star in GLIMPSE20. We combine this information with the available photometric measurements from Two Micron All Sky Survey, to estimate cluster masses, ages, and distances. The presence of several massive stars places the Quartet and GLIMPSE20 among the small sample of known Galactic stellar clusters with masses of a few 103 M☉, and ages from 3 to 8 Myr. We estimate a distance of about 3.5 kpc for GLIMPSE20 and 6.0 kpc for Quartet. The large number of giant stars identified in GLIMPSE13 indicates that it is another massive (∼6500 M☉) cluster, but older, with an age between 30 and 100 Myr, at a distance of about 3 kpc.
infrared: stars - stars: evolution
Text, Table 1: NAME The Quartet. Table 2: [MDI2009] Quartet N (Nos 1-9), [MDI2009] GLIMPSE20 NN (Nos 1-11), [MDI2009] GLIMPSE13 NN (Nos 1-15).
View the reference in ADS
To bookmark this query, right click on this link: simbad:2009ApJ...697..701M and select 'bookmark this link' or equivalent in the popup menu