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Applications of Multi-object Spectroscopy – A large Sample of Carbon Stars in the LMC

Published online by Cambridge University Press:  25 May 2016

Russell Cannon ,
Alison Offer ,
Despina Hatzidimitriou ,
Barry Croke  and
David Morgan
Russell Cannon
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
Alison Offer
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
Despina Hatzidimitriou
Affiliation:
Physics Department, University of Crete, PO Box 2208, GR 710 03, Heraklion, Crete, Greece
Barry Croke
Affiliation:
Physics Department, University of Crete, PO Box 2208, GR 710 03, Heraklion, Crete, Greece
David Morgan
Affiliation:
Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, Scotland, UK

Abstract

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The application of multi-object instruments to nearby galaxies permits the spectroscopy of large samples of faint stars. Such data are needed to determine the kinematics and metallicity distributions of stellar systems, to complement the excellent photometric data now becoming available. Together, these data should reveal the star formation and evolutionary histories of Local Group galaxies. The Two-degree Field (2dF) instrument on the Anglo-Australian Telescope is described and some initial results are presented for a sample of 700 carbon stars in the Large Magellanic Cloud. The velocity precision is more than adequate for kinematic studies, while the application of Principal Component Analysis techniques promises to yield an objective and quantitative classification scheme for carbon stars. This may lead to a better understanding of the carbon stars themselves, as well as enhancing their use as tracers of the intermediate-age and old stellar populations. Another application of multi-fibre spectroscopy, to a sample of main sequence stars in the globular cluster 47 Tuc, illustrates the possibility of combining the data for many faint stars to yield composite spectra with relatively high signal-to-noise ratio.

Type
Part 5. Wider Implications and Future Prospects
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 480 - 488
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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