Photometric Study and Detection of Variable Stars in the Open Clusters - I : NGC 6866

Дата и время публикации : 2011-09-29T06:45:28Z

Авторы публикации и институты :
Yogesh C. Joshi (ARIES)
Santosh Joshi (ARIES)
Brijesh Kumar (ARIES)
Soumen Mondal (ARIES)
L. A. Balona (SAAO)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: accepted for publication in MNRAS
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: We present results of a variability search in the intermediate-age open cluster NGC 6866 from 29 nights over two observing seasons. We find 28 periodic variables, of which 19 are newly identified. The periods of these variables, which have V magnitudes from 11.5 to 19.3 mag, range from ~ 48 min to 37 d. We detected several delta-Scuti stars, some of which are of high amplitude, as well as gamma-Doradus, rotational variables and eclipsing binaries. In order to study the physical properties of the cluster, we obtained UBVRI photometry of all the stars on a good photometric night. The radial distribution of the stellar surface density shows that the cluster has a radial extent of about 7 arcmin (~3 pc) with a peak density of 5.7+/-0.7 stars/arcmin^2 at the cluster center. The colour-colour diagram indicates a reddening of E(B-V) = 0.10 mag towards NGC 6866. A distance of ~ 1.47 kpc and an age of ~ 630 Myr is estimated from the colour-magnitude diagram using the theoretical isochrones of solar metallicity.

Category: Physics