The open cluster IC 4996: new parameters
Abstract
The open cluster IC 4996 area in Cygnus is investigated applying two-dimensional photometric classification of stars observed in the Vilnius seven-color photometric system down to V = 18.5 mag. B-type stars are identified as possible cluster members applying their proper motions from the Altmann et al. A&A 600, L4 (2017) catalog based on the Gaia DR1 and the PPMXL catalog. For most of them spectroscopic MK types are also obtained from the Asiago spectra. New parameters of the cluster are derived. The mean interstellar extinction in the central part of the cluster Av = 2.02 mag, the distance is close to 2 kpc and the age 9--10 million years. The plot of Av versus d in the area of IC 4996 shows a steep increase of the extinction at 500--600 pc which is related to dust clouds in the Great Cygnus Rift.
- Publication:
-
American Astronomical Society Meeting Abstracts #231
- Pub Date:
- January 2018
- Bibcode:
- 2018AAS...23134405B