J.-M. Will

CCD and Schmidt-Plate Photometry and Astrometry in Region E of the LMC

Shapley Constellation HI in the north of the LMC is one of the largest associations in the LMC. It is surrounded by a ring of H II regions and diffuse H II filaments called Supergiant Shell LMC 4 (Goudis & Meaburn 1978). LMC 4 is suspected to be a site of large scale propagation of star formation (Dopita et al. 1985), but recent studies (Reid et al. 1987; Vallenari et al. 1993) show that the situation is far from simple.

Star formation history in the keyprogram Regions C and E in the LMC

CCD photometry of 4 fields in Region C (de Boer et al., 1989 and 1991) at the NW side of the LMC and of 10 fields in Region E at the NW edge of supershell LMC4 in the NE shows that the stellar population comes from a wide range of star formation epochs. We have reduced the data with DAOPHOT and we can thus produce colour-magnitude diagrams (CMDs) with error indications and with proper information on completeness of the data. Field stars are subtracted. The CMDs are used to derive ages and mass functions.