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Title: UBV photometry of the anticenter cluster Berkeley 21

Abstract

UBV photometry of approximately 200 stars in the faint anticenter cluster, Berkeley 21, was obtained primarily with the Kron electronic camera. Analysis of the color--magnitude and two-color diagrams indicates that Be21 is a highly reddened (E (B-V) approx.1.0) cluster resembling clusters found in the Magellanic Clouds. Since the Magellanic Clouds are known to be metal poor with respect to the Galaxy, the results suggest that objects located at large galactocentric radii may be quite metal deficient, in agreement with recent theoretical models of the chemical evolution of the Galaxy. The cluster exhibits an ultraviolet excess of about 0.3 mag, which supports the idea that the cluster is metal poor. Estimates of the distance modulus place the object 10--15 kpc from the sun, that is, 20--25 kpc from the galactic center.

Authors:
;
Publication Date:
Research Org.:
Astronomy Department, Boston University, Boston, Massachusetts 02215
OSTI Identifier:
6775216
Alternate Identifier(s):
OSTI ID: 6775216
Resource Type:
Journal Article
Journal Name:
Astron. J.; (United States)
Additional Journal Information:
Journal Volume: 84:2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MILKY WAY; GALACTIC EVOLUTION; METALS; STAR CLUSTERS; PHOTOMETRY; ABUNDANCE; AGE ESTIMATION; DISTANCE; INTERSTELLAR GRAINS; ELEMENTS; GALAXIES; PARTICLES 640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources; 640105 -- Astrophysics & Cosmology-- Galaxies

Citation Formats

Christian, C.A., and Janes, K.A. UBV photometry of the anticenter cluster Berkeley 21. United States: N. p., 1979. Web. doi:10.1086/112409.
Christian, C.A., & Janes, K.A. UBV photometry of the anticenter cluster Berkeley 21. United States. doi:10.1086/112409.
Christian, C.A., and Janes, K.A. Thu . "UBV photometry of the anticenter cluster Berkeley 21". United States. doi:10.1086/112409.
@article{osti_6775216,
title = {UBV photometry of the anticenter cluster Berkeley 21},
author = {Christian, C.A. and Janes, K.A.},
abstractNote = {UBV photometry of approximately 200 stars in the faint anticenter cluster, Berkeley 21, was obtained primarily with the Kron electronic camera. Analysis of the color--magnitude and two-color diagrams indicates that Be21 is a highly reddened (E (B-V) approx.1.0) cluster resembling clusters found in the Magellanic Clouds. Since the Magellanic Clouds are known to be metal poor with respect to the Galaxy, the results suggest that objects located at large galactocentric radii may be quite metal deficient, in agreement with recent theoretical models of the chemical evolution of the Galaxy. The cluster exhibits an ultraviolet excess of about 0.3 mag, which supports the idea that the cluster is metal poor. Estimates of the distance modulus place the object 10--15 kpc from the sun, that is, 20--25 kpc from the galactic center.},
doi = {10.1086/112409},
journal = {Astron. J.; (United States)},
number = ,
volume = 84:2,
place = {United States},
year = {1979},
month = {2}
}