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IC 361, a distant intermediate-age cluster in Camelopardalis†

Published online by Cambridge University Press:  18 January 2010

Justas Zdanavičius ,
Richard P. Boyle ,
Frederick J. Vrba ,
Kazimieras Zdanavičius  and
Stanislava Bartašiūtė
Justas Zdanavičius
Affiliation:
Astronomical Observatory of Vilnius University, Čiurlionio 29, Vilnius, LT-03100, Lithuania email: justas@itpa.lt, kz@itpa.lt
Richard P. Boyle
Affiliation:
Vatican Observatory Research Group, Steward Observatory, Tucson, AZ 85721, USA email: boyle@ricci.as.arizona.edu
Frederick J. Vrba
Affiliation:
US Naval Observatory Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002, USA email: fjv@nofs.navy.mil
Kazimieras Zdanavičius
Affiliation:
Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, Vilnius, LT-01108, Lithuania
Stanislava Bartašiūtė
Affiliation:
Astronomical Observatory of Vilnius University, Čiurlionio 29, Vilnius, LT-03100, Lithuania email: justas@itpa.lt, kz@itpa.lt
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Abstract

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We have undertaken CCD photometry in the eight-color Vilnius + I system for the open cluster IC 361 (l = 147.5°, b = 5.7°) located in the constellation of Camelopardalis. Based on multicolor data, estimates of distance moduli, foreground reddening and metallicity have been obtained for individual stars measured in the field of the cluster. This allowed us to eliminate most of the field stars and to identify the probable cluster members, from which we derived the true distance modulus (m − M)0 = 12.7 mag and metallicity [Fe/H] = −0.3 dex. The interstellar extinction is found to be nonuniform across the field, with values of AV ranging from 1.9 to 2.6 mag. A comparison of the color–magnitude diagrams with Padova isochrones yields (m − M)0 = 12.6 mag, or a cluster distance of 3.3 kpc, and an age of 1.0 Gyr. Therefore, IC 361 appears to be a mildly metal-deficient cluster of intermediate age, located as far as, or just beyond, the Perseus spiral arm.

Keywords

techniques: photometricopen clusters and associations: individual (IC 361)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 557 - 560
Copyright
Copyright © International Astronomical Union 2010

References

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