Variable stars in the field of open cluster NGC 6939
| dc.creator | Maciejewski, G. | |
| dc.creator | Georgiev, Ts. | |
| dc.creator | Niedzielski, A. | |
| dc.date | 2007-11-30 | |
| dc.date.accessioned | 2026-07-07T08:46:25Z | |
| dc.date.available | 2026-07-07T08:46:25Z | |
| dc.description | The results of CCD photometric survey performed with the 90/180 cm Schmidt-Cassegrain Telescope of the Nicolaus Copernicus University Astronomical Observatory in Piwnice (Poland) and the 70/172 cm Schmidt Telescope of the National Astronomical Observatory (NAO) at Rozhen (Bulgaria) of the field of 1 Gyr old open cluster NGC 6939 are presented. Twenty two variable stars were detected, four of them previously known. Four eclipsing systems (3 detached and 1 contact binary) were found to be members of the cluster. Analysis of the brightness of the contact binary V20 strongly supports the distance to the cluster of 1.74 +/- 0.20 kpc. The small population of contact binaries in NGC 6939 confirms also the relatively young age of the cluster. | |
| dc.description | 9 pages, 3 figures, accepted for publication in AN | |
| dc.identifier | https://arxiv.org/abs/0711.4916 | |
| dc.identifier | http://arxiv.org/abs/0711.4916 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/143242 | |
| dc.subject | Astrophysics | |
| dc.title | Variable stars in the field of open cluster NGC 6939 | |
| dc.type | text |