Physical Parameters of the Old Open Cluster Trumpler 5

Abstract

We present a study of the old open cluster Trumpler 5 (Tr 5), based on the CDS archival data. From the color-magnitude diagrams of Tr 5, we have found the positions of main-sequence turn-off (MSTO) and red giant clump (RGC) stars. Using the mean magnitude of the RGC stars, we have estimated the reddening toward Tr 5, E(B-V) = 0.60 +/- 0.10. Using the stars common in two data sets and the theoretical isochrones of Padova group, we have estimated the distance modulus V_0-M_V=12.64 +/- 0.20 (d = 3.4 +/- 0.3 kpc), the metallicity [Fe/H] = -0.30 +/- 0.10, and the age of 2.4 +/- 0.2 Gyr (log t=9.38). These metallicity and distance values are consistent with the relation between the metallicity and the Galactocentric distance of other old open clusters, for which we obtain the slope of Delta_[Fe/H]/R_gc= -0.064 +/- 0.010 dex/kpc.

9 pages(AASLaTeX), 8 Postscript figures, Accepted for publication in the Journal of the Korean Astronomical Society, 2003 March issue

References in corpus (1)

• On the Galactic Disk Metallicity Distribution from Open Clusters I. New Catalogues and Abundance Gradient

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• The Infrared Ca II triplet as metallicity indicator
• A catalog of 120 NGC open star clusters
• The old, metal-poor, anticentre open cluster Trumpler 5
• Determination of dynamical ages of open clusters through the A${}^{+}$ parameter -- I
• The frequency by mass of Galactic carbon stars inferred from Gaia measurements of star cluster members
• Photometry of the Four Anti-Galactocentric Old Open Clusters: Czernik 30, Berkeley 34, Berkeley 75, and Berkeley 76
• Astrophysical parameters of ten poorly studied open star clusters