Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.379..159c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 379, Issue 1, pp. 159-168.
Astronomy and Astrophysics
Astronomy
3
Techniques: Photometric, Open Clusters And Associations: General, Open Clusters And Associations: Individual: Ngc2236
Scientific paper
New CCD photometry in the Washington system C and T1 passbands down to T1 ~ 18.5 mag in the field of the northern open cluster NGC2236 is presented. T1 magnitudes and C - T1 colours for a total of 1162 stars within an area of 13.6 × 13.6 arcmin2 were measured. These CCD data were supplemented with photoelectric CMT1T2 photometry of 13 red giant candidates. The comparison of the cluster (T1, C - T1) colour-magnitude diagram with theoretical isochrones computed for the Washington system yields E(C - T1) = 1.10 +/- 0.10 and for log t = 8.80 (t = 600+100-40 Myr) and Z = 0.008. The derived E(C - T1) value implies E(B - V) = 0.55 +/- 0.05. NGC2236 is then located at 2.5 +/- 0.5 kpc from the Sun beyond the Perseus spiral arm and at ~10.8 kpc from the Galactic centre. A cluster angular diameter of 9.4 arcmin, equivalent to 6.8 pc, was estimated from star counts both within and outside the cluster field. We also derived from the stellar density profile a cluster core radius of rc = 1.7 arcmin (1.2 pc) and an annular corona of Δrc = 1.8rc (2.2 pc). Five independent Washington abundance indices yield a mean cluster metallicity of [Fe/H] = -0.3 +/- 0.2, which is not only in reasonably good agreement with the one obtained from the isochrone fit, but also compatible with the existence of a radial abundance gradient in the Galactic disc. We examined the properties of a sample of 20 known open clusters aligned along the line-of-sight to NGC2236. Berkeley27 appears as the farthest and oldest cluster of the studied sample.
Ahumada Andrea V.
Claria Juan J.
Parisi María Celeste
Piatti Andrés E.
No associations
LandOfFree
NGC2236: a moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with NGC2236: a moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NGC2236: a moderately metal-poor open cluster of Hyades-like age located beyond the Perseus spiral arm will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-786209