TNG photometry of the open cluster NGC 6939

Details TNG photometry of the open cluster NGC 6939 TNG photometry of the open cluster NGC 6939

2003-05-29

arxiv.org/abs/astro-ph/0305561v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, proceedings of "Stars in Galaxies", La Palma 2003. To appear in MmSAI. Uses mem.cls

Scientific paper

We present CCD UBVI photometry of the intermediate age open cluster NGC 6939 for three TNG-DOLORES fields. The fields A and B cover the center of the cluster; the third one is located about 30 arcmin away, and is used for field stars decontamination. The V-I, B-V and U-B color-magnitude diagrams (CMDs), obtained joining very different exposures show: i) a Main Sequence (MS) extending down to V = 24, much deeper (~ 5 magnitudes) than any previous study; ii) a clearly defined Turn Off (TO) and iii) a well populated Red Giant Clump (RC) at about V = 13.

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