SIMBAD references

2002A&A...396...53R - Astronomy and Astrophysics, volume 396, 53-64 (2002/12-2)

The present-day chemical composition of the LMC.


Abstract (from CDS):

High-resolution observations of five OB-type main-sequence stars in the Large Magellanic Cloud (LMC) have been obtained with the UCL echelle spectrograph on the 3.9-m Anglo-Australian Telescope. These spectra have been analysed using LTE model-atmosphere techniques, to derive stellar atmospheric parameters and chemical compositions. As these stars are located within the hydrogen burning main-sequence band, their surface abundances should reflect those of the present-day interstellar medium. Detailed line-by-line differential analyses have been undertaken relative to Galactic comparison stars. We conclude that there exists a general metal deficiency of -0.31±0.04dex within the LMC, and find no significant abundance variations between cluster and field stars. There is also tentative evidence to suggest a lower oxygen to iron abundance ratio, and an over-deficiency of magnesium relative to the other α-elements. These are discussed in terms of previous abundance analyses and models of discontinuous (or bursting) star formation within the LMC. Finally, there is some evidence to suggest a greater chemical enrichment of material within the HII region LH 104.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: early-type - galaxies: individual: Large Magellanic Cloud

CDS comments: In table 1, LH 9-1160 = PGMW 1160 and LH 10-3270 = PGMW 3270.

Simbad objects: 27

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