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Old Structure – Young Stars The Stellar Content of the Centre of the LMC Bar

Published online by Cambridge University Press:  25 May 2016

P. Linde ,
A. Ardeberg  and
B. Gustafsson
P. Linde
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden, ({peter, arne} @astro, lu. se)
A. Ardeberg
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden, ({peter, arne} @astro, lu. se)
B. Gustafsson
Affiliation:
Uppsala Astron. Observatory, Box 515, SE-751 20 Uppsala, Sweden ([email protected])

Abstract

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The history of star formation and chemical evolution are studied in the LMC Bar centre with the HST PC and WFC and uvby photometry. Using dedicated image processing, we secured high spatial resolution and photometric quality. We present colour magnitude diagrams (CMDs) from PC and WFC y and b data. The PC provides a CMD close to complete to V = 23.5, the WFC contributes favourable statistics on brighter stars. We find a population of stars seemingly around or younger than 0.2 Gyr comprising around 30% of the total amount of stars. Star formation seems to have decreased 3-0.2 Gyr ago. Older populations are aged 3–9 Gyr. Stars older than 10 Gyr seem rare if not absent. Our CMD morphology and, especially, our uvby metallicity index give [Me/H] close to −0.4, with older stars more and younger stars less metal poor.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 108 - 111
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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