Two-stage starbursts in the Large Magellanic Cloud - N11 as a once and future 30 Doradus

Details Two-stage starbursts in the Large Magellanic Cloud - N11 as a once and future 30 Doradus Two-stage starbursts in the Large Magellanic Cloud - N11 as a once and future 30 Doradus

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..87w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L87-L89.

Astronomy and Astrophysics

Astrophysics

97

H Ii Regions, Magellanic Clouds, Star Formation, Starburst Galaxies, Galactic Evolution, O Stars, Protostars, Stellar Activity, Stellar Spectra

Scientific paper

A recent, detailed study of the stellar content in the LMC giant shell H II region N11 has revealed a distinct, dual structural morphology, which is remarkably analogous to that emerging from current IR imaging of 30 Doradus. In both regions, the energetic stellar activity from an initial, massive, centrally condensed starburst has apparently triggered a secondary burst around its periphery about 2 x 10 exp 6 years later, but in N11 the entire process is more advanced than in 30 Dor by 2 x 10 exp 6 years. That is, N11 appears to be an evolved 30 Dor. There is evidence that the two sequential star-formation mechanisms may produce different IMFs. In both regions, very early stages of massive stellar evolution are evident, including IR protostars, O stars embedded in dense nebular knots, candidate ZAMS O stars, and the O3 stars. Spectra of several recently discovered examples of the latter three categories in N11 are illustrated, and previously unpublished 4 m photographs of the region demonstrate their spectacular interactions with the surrounding interstellar medium.

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