Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aca....42..155k&link_type=abstract
Acta Astronomica (ISSN 0001-5237), vol. 42, no. 3, p. 155-175.
Astronomy and Astrophysics
Astronomy
33
Color-Magnitude Diagram, Open Clusters, Star Distribution, Variable Stars, Milky Way Galaxy, Stellar Spectrophotometry
Scientific paper
We present the results of Johnson BV and Cousins I CCD photometric observations of the intermediate-age distant open cluster Tombaugh 2 (To 2). The standard procedure of fitting theoretical isochrones to the observed color-magnitude diagrams allows us to conclude that the distance to the cluster is 6.3 +/- 0.9 kpc, and its age is 4 Gyr assuming E(B - V) = 0.40 mag. Five nights of continuous monitoring of To 2 in the Cousins I band resulted in the discovery of six eclipsing variables with well-defined light curves. Four of these variables are W UMa eclipsing systems, one is an RS CVn system, and the sixth is very likely an Algol-type binary. All six variables lie within the projected boundary of the cluster, and on the color-magnitude diagram they occupy a region reasonably close to the cluster's main-sequence. In addition to these six variables, we also identified one possible variable outside the cluster limits and a very red variable object of unknown nature near the cluster center.
Kaluzny Janusz
Krzeminski Wojciech
Kubiak Mateo M. M.
Mateo Mario
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