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CCD photometry of distant open clusters

J. Kałużny

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Abstract

We present BVI photometry for Trumpler 5, a rich open cluster located in the Galactic anticenter. The cluster age is slightly lower than the age of M 67. Its distance modulus $(m-M)_{0}$ and reddening $E(B-V)$ are estimated at 12.4 and 0.58, respectively. These values were obtained for the assumed solar metallicity of the cluster. Our data indicate that Tr 5 is one of the richest objects among the sample of known old open clusters. The total mass included only in upper-main sequence stars exceeds 3000 $m_{\odot}$. The angular diameter of the cluster is estimated at 11.6 arcmin, which corresponds to a linear size of about 20 pc for an estimated distance $d\approx 3.0$ kpc.

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We present BVI photometry for Trumpler 5, a rich open cluster located in the Galactic anticenter. The cluster age is slightly lower than the age of M 67. Its distance modulus $(m-M)_{0}$ and reddening $E(B-V)$ are estimated at 12.4 and 0.58, respectively. These values were obtained for the assumed solar metallicity of the cluster. Our data indicate that Tr 5 is one of the richest objects among the sample of known old open clusters. The total mass included only in upper-main sequence stars exceeds 3000 $m_{\odot}$. The angular diameter of the cluster is estimated at 11.6 arcmin, which corresponds to a linear size of about 20 pc for an estimated distance $d\approx 3.0$ kpc.

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Available abstract

We present BVI photometry for Trumpler 5, a rich open cluster located in the Galactic anticenter. The cluster age is slightly lower than the age of M 67. Its distance modulus $(m-M)_{0}$ and reddening $E(B-V)$ are estimated at 12.4 and 0.58, respectively. These values were obtained for the assumed solar metallicity of the cluster. Our data indicate that Tr 5 is one of the richest objects among the sample of known old open clusters. The total mass included only in upper-main sequence stars exceeds 3000 $m_{\odot}$. The angular diameter of the cluster is estimated at 11.6 arcmin, which corresponds to a linear size of about 20 pc for an estimated distance $d\approx 3.0$ kpc.

Key concepts: Open cluster, Distance modulus, Photometry (optics), Metallicity, Physics, Astrophysics, Stars, Astronomy

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