Mon. Not. R. Astron. Soc., 384, 1733-1740 (2008/March-2)
A populous intermediate-age open cluster and evidence of an embedded cluster among the FSR globular cluster candidates.
BICA E. and BONATTO C.
Abstract (from CDS):
We study the nature of the globular cluster (GC) candidates FSR 1603 and FSR1755 selected from the catalogue of Froebrich, Scholz & Raftery. Their properties are investigated with Two-Micron All-Sky Survey field-star decontaminated photometry, which is used to build colour-magnitude diagrams (CMDs) and stellar radial density profiles. FSR1603 has the open cluster Ruprecht 101 as optical counterpart, and we show it to be a massive intermediate-age cluster. Relevant parameters of FSR1603 are the age ~1Gyr, distance from the Sun d☉~ 2.7kpc, Galactocentric distance RGC~ 6.4kpc, core radius RC~ 1.1pc, mass function slope χ ~ 1.8, observed stellar mass (for stars with mass in the range 1.27 ≤ m ≤ 2.03M☉) Mobs~ 500M☉ and a total (extrapolated to m = 0.08M☉) stellar mass Mtot~ 2300M☉. FSR1755, on the other hand, is not a populous cluster. It may be a sparse young cluster embedded in the HII region Sh2-3, subject to an absorption AV~ 4.1, located at d☉~ 1.3kpc. Important field-star contamination, spatially variable heavy dust obscuration, even in Ks, and gas emission characterize its field. A nearly vertical, sparse blue stellar sequence shows up in the CMDs.
2008 The Authors. Journal compilation © 2008 RAS
open clusters and associations: general - Galaxy: structure
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