Stellar populations and the large-scale structure of the Small Magellanic Cloud. IV - Age distribution studies of the outer regions

Details Stellar populations and the large-scale structure of the Small Magellanic Cloud. IV - Age distribution studies of the outer regions Stellar populations and the large-scale structure of the Small Magellanic Cloud. IV - Age distribution studies of the outer regions

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..195g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 195-224. Research support

Astronomy and Astrophysics

Astronomy

64

Galactic Evolution, Magellanic Clouds, Star Distribution, Star Formation, Astronomical Photometry, Blue Stars, Color-Magnitude Diagram, Horizontal Branch Stars, Main Sequence Stars, Photographic Plates, Spatial Distribution

Scientific paper

Within the framework of an investigation of the large-scale structure and stellar content of the SMC on the basis of photometric analysis of sets of blue and red UK Schmidt Telescope (UKST) photographic plates, a study is presented of the age and spatial distribution of stellar populations in an area covering six UKST survey fields, i.e., virtually the entire outer area of the SMC. The existence of a very old stellar population of age 15-16 Gyr, comprising about 7 percent of the stellar content of the outer regions by mass, is suggested by the observational results. The bulk of the stellar population in the outer regions of the SMC is found to be about 10 Gyr old. The distribution of stellar populations younger than about 2 Gyr is shown to be biased towards the eastern side of the SMC facing the LMC. The star-formation history of the outer regions is discussed with particular reference to the role of interactions between the MC-SMC-Galaxy system.

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