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Photometry of seven overlooked open clusters in the first and fourth Galactic quadrants
CCD BVI photometry is presented for seven previously unstudied starclusters projected towards the inner side of the Galaxy: Trumpler 23,Lynga 3, Collinder 307, Ruprecht 134, ESO552SC16, AL 5 and Kronberger 3.Colour-magnitude diagrams of the cluster regions allow us to concludethat Lynga 3 and ESO552SC16 are not clusters, but groups of bright starsprobably located in the Carina-Sagittarius spiral arm. AL 5 andKronberger 3 are so embedded in a dense stellar field that we cannotconfirm their nature. Trumpler 23 and Ruprecht 134 are twointermediate-age open clusters located well inside the solar ring whichdeserve further attention.Finally, Collinder 307 is an obscured younger cluster (250Myr) locatedin the Carina-Sagittarius spiral arm. Our results emphasize thedifficulty to search for open clusters in the inner regions of theGalaxy due to the richness of the field and the patchy nature of theinterstellar absorption, but at the same time significantly contributeto a better understanding of this complicated regions of the Milky Way.
| Photometry of neglected open clusters in the first and fourth Galactic quadrants
CCD BVI photometry is presented for eight previously unstudied starclusters located in the first and fourth Galactic quadrants: AL 1, BH150, NGC 5764, Lynga 9, Czernik 37, BH 261, Berkeley 80 and King 25.Colour-magnitude diagrams of the cluster regions suggest that several ofthem (BH 150, Lynga 9, Czernik 37, BH 261 and King 25) are so embeddedin the dense stellar population toward the galactic centre that theirproperties, or even their existence as physical systems, cannot beconfirmed. Lynga 9, BH 261 and King 25 appear to be slight enhancementsof dense star fields, BH 150 is probably just a single bright star in adense field and Czernik 37 may be a sparse, but real clustersuperimposed on the galactic bulge population. We derive preliminaryestimates of the physical parameters for the remaining clusters. AL 1appears to be an intermediate-age cluster beyond the solar circle on thefar side of the galaxy and the final two clusters, NGC 5764 and Berkeley80, are also of intermediate age but located inside the solar ring. Thisset of clusters highlights the difficulties inherent in studying thestellar populations toward the inner regions of the galaxy.
| Uniform survey of clusters in the southern Milky Way.
Abstract image available at:http://adsabs.harvard.edu/abs/1975AJ.....80...11V
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