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 04:00:00 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), Journal Name: Astrophys. J., Suppl. Ser.; (United States) Vol. 55:2; ISSN APJSA
• Country of Publication: United States
• Language: English

Related Subjects

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