Bibcode
Tapia, M. T.; Schuster, W. J.; Michel, R.; C. Chavarría-K.; Dias, W. S.; Vázquez, R.; Moitinho, A.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 1, pp. 621-632.
Advertised on:
1
2010
Número de citas
12
Número de citas referidas
10
Descripción
The three open clusters Be 15, Be 80 and NGC 2192 have been observed
using CCD UBV(RI)C photometry at the San Pedro Mártir
Observatory, México within the framework of our open-cluster
survey. The fundamental parameters of interstellar reddening, distance
and age have been derived, and also the metallicity for NGC 2192 (solar
metallicity has been assumed for the other two). By shifting the colours
of Schmidt-Kaler in the (U - B,B - V) two-colour diagram along the
appropriate reddening vector, the interstellar reddenings have been
derived as E(B - V) = 0.23 +/- 0.03 mag for Be 15, 1.31 +/- 0.05 for Be
80, and 0.16 +/- 0.03 for NGC 2192. Evidence is shown for a variable
interstellar extinction across the cluster Be 80. For NGC 2192, a nicely
consistent fit is obtained for both the interstellar reddening and the
metallicity ([Fe/H] = -0.31) using simultaneously the F-type and
red-clump stars.
By fitting isochrones to the observed sequences of these three clusters
in various colour-magnitude diagrams of different colour indices (B -
V,V - I or V - R), the averages of distance moduli and heliocentric
distances [(V - MV)o (mag); d(pc)] are the
following: (10.74 +/- 0.01; 1202) for Be 15, (10.75 +/- 0.01; 1413) for
Be 80 and (12.7 +/- 0.01; 3467) for NGC 2192, and the averages of the
inferred best ages [log(age) age(Gyr)] are (8.6 +/- 0.05; 0.4) for Be 80
and (9.15 +/- 0.05; 1.4) for NGC 2192; for Be 15 there are two distinct
possibilities for the age fit, depending on the membership of three
brighter stars (9.35 or 9.95 +/- 0.05; 2.2 or 8.9). The need for
spectroscopic observations in Be 15 is emphasized to select between
alternate reddening and age solutions, and for deeper UBV observations
in Be 80 to study in greater detail the variable interstellar, or
intracluster, reddening across this cluster.
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