Baltic Astronomy, 17, 51-65 (2008/April-0)
Photometric study of open clusters NGC 2266 and NGC 7762.
MACIEJEWSKI G., BOEVA S., GEORGIEV Ts., MIHOV B., OVCHAROV E., VALCHEVA A. and NIEDZIELSKI A.
Abstract (from CDS):
The results of photometric UBV monitoring of open clusters NGC 2266 and NGC 7762 are presented. 2MASS JH photometry is additionally used to determine the parameters of both clusters. For NGC 2266 the following parameters are obtained: the limiting radius 6.2 arcmin, log (age [yr]) = 9.08±0.04, metallicity Z = 0.004 ([Fe/H] = - 0.68), interstellar reddening EB–V = 0.17 and a distance of 2.80±0.15 kpc. No evidence for the existence of an extended corona was found. As a result of 45 hour monitoring of 7200 stars in the cluster field, 12 were found to be variable. All of them are located outside the cluster radius. For NGC 7762 the following parameters are obtained: limiting radius 23.5 arcmin (including an extended corona), log(age [yr]) = 9.38±0.04, interstellar reddening EB–V = 0.59 and a distance of 0.8±0.25 kpc; solar metallicity is accepted. The near-IR data suggest EJ–H = 0.11 and a peculiar interstellar reddening law. As a result of 55 hour monitoring of 5500 stars in the cluster field, 16 stars are found to be variable. Two of them, a short-period contact or semi-detached eclipsing system and a pulsating star of γ Dor type - are likely members of NGC 7762.
open clusters: stars: individual (NGC 2266, NGC 7762)
Table 3: Cl* NGC 2266 MBG VNN (Nos V1-V12). Table 5: Cl* NGC 7762 MBG VNN (Nos V1-V16).
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