Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...55..127s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 55, June 1984, p. 127-177.
Astronomy and Astrophysics
Astrophysics
45
Astronomical Photography, Magellanic Clouds, Stellar Spectrophotometry, Blue Stars, Halos, Horizontal Branch Stars, Photographic Plates, Stellar Color, Stellar Evolution, Stellar Magnitude
Scientific paper
Photographic photometry is reported for 16 far-halo-field regions. These fields lie 9.1 deg 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.
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