Photometry of seven overlooked open clusters in the First and Fourth Galactic Quadrants

Abstract

CCD BVI photometry is presented for 7 previously unstudied star clusters projected toward the inner side of the Galaxy: Trumpler 23, Lynga 3, Collinder 307, Ruprecht 134, ESO552SC16, AL 5 and Kronberger 3. Color magnitude diagrams of the cluster regions allow us to conclude that Lynga 3 and ESO552SC16, are not clusters, but groups of bright stars probably located in the Carina-Sagittarius spiral arm. AL 5 and Kronberger 3 are so embedded in a dense stellar field that we cannot confirm their nature. Trumpler~ 3 and Ruprecht 134 are two intermediate-age open clusters located well inside the solar ring which deserve further attention. Finally, Collinder 307 is an obscured younger cluster (250 Myr) located in the Carina-Sagittarius spiral arm. Our results emphasize the difficulty to search for open clusters in the inner regions of the Galaxy due to the richness of the field and the patchy nature of the interstellar absorption, but at the same time significantly contribute to a better understanding of this complicated regions of the Milky Way.

arXiv comment11 pages, 16 degraded eps figures, in press in MNRAS

References in corpus (9)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results
• Star clusterings in the Carina complex: UBVRI photometry of Bochum 9, 10 and 11
• A photometric study of the old open clusters Berkeley 73, Berkeley 75 and Berkeley 25
• NGC 6404 and NGC 6583: two neglected intermediate-age open clusters located in the Galactic Center direction
• Photometry of neglected open clusters in the First and Fourth Galactic Quadrants
• Luminosity and mass function of galactic open clusters: I. NGC 4815
• Luminosity and mass functions of galactic open clusters: II. NGC 4852
• The intermediate-age open clusters Ruprecht 61, Czernik 32, NGC 2225 and NGC 2262

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