Star formation history of the young association NGC 1948 at the edge of the supergiant shell LMC4

Details Star formation history of the young association NGC 1948 at the edge of the supergiant shell LMC4 Star formation history of the young association NGC 1948 at the edge of the supergiant shell LMC4

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..137v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 137-148.

Astronomy and Astrophysics

Astrophysics

26

Magellanic Clouds, Star Clusters, Star Formation, Stellar Envelopes, Supergiant Stars, Binary Stars, Charge Coupled Devices, Color-Magnitude Diagram, Interstellar Extinction, Stellar Luminosity, Stellar Rotation, Stellar Spectrophotometry

Scientific paper

We present Johnson BV CCD photometry of 5 overlapping fields stretching approximately 15 arcmin across the association NGC 1948 in the NW section of the supergiant shell LMC4. The color-magnitude diagram shows a main sequence termination magnitude at about V(T) = 14. After correction for the presence of Galactic foreground stars and LMC field stars and including possible effects of binaries, of stellar rotation, and of metallicity on the turn-off magnitude we find from main sequence fitting ages ranging from 25 to 7 Myr. These numbers depend on the different treatment of convection in the stellar models used. Some features of the color-magnitude diagram and the shape of the integrated luminosity function suggest star formation lasting up to 10 Myr. These ages are much larger than those which follow from models for the expansion of LMC4 and their prediction of subsequent star formation.

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