Faint star studies in the magellanic clouds. II. Field regions 9/sup 0/ northeast of the large magellanic cloud bar

Journal Article · Fri Jun 01 00:00:00 EDT 1984 · Astrophys. J., Suppl. Ser.; (United States)

DOI:https://doi.org/10.1086/190950· OSTI ID:6654533

Stryker, L L

Photographic photometry is reported for 16 halo field regions. These fields lie 9./sup 0/1 northeast of the LMC bar, surrounding the old globular cluster NGC 2257. Field color-magnitude diagrams show a red horizontal branch, a subgiant branch redder than that of the cluster, and a profusion of blue stars delineating a younger main-sequence. Possible sources of the blue stars are discussed. The field is significantly younger than the cluster, showing that star formation, even in the outer regions of the LMC where the gas density is presently minimal, proceeded long after the formation of the old clusters. It appears that the major portion of stars in the LMC is of intermediate age. That this is true of a region 9 kpc from the bar is of great importance to the eventual derivation of a global history of star formation in the LMC.

• Research Organization: Yale University Observatory, and Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics
• OSTI ID: 6654533
• Journal Information: Astrophys. J., Suppl. Ser.; (United States), Vol. 55:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MAGELLANIC CLOUDS
BRIGHTNESS
COLOR
STAR EVOLUTION
COSMIC GASES
GALACTIC EVOLUTION
LUMINOSITY
PHOTOGRAPHIC EMULSIONS
PHOTOMETRY
STAR CLUSTERS
STARS
COLLOIDS
DISPERSIONS
EMULSIONS
FLUIDS
GALAXIES
GASES
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 - Astrophysics & Cosmology- Galaxies