Quantitative spectroscopy of O-stars in the Magellanic Clouds. I - The young open cluster NGC 346 in the SMC

Details Quantitative spectroscopy of O-stars in the Magellanic Clouds. I - The young open cluster NGC 346 in the SMC Quantitative spectroscopy of O-stars in the Magellanic Clouds. I - The young open cluster NGC 346 in the SMC

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226..235k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 235-248.

Physics

Optics

28

Astronomical Spectroscopy, Magellanic Clouds, O Stars, Open Clusters, Abundance, Cassegrain Optics, Charge Coupled Devices, Stellar Evolution, Stellar Luminosity, Stellar Temperature

Scientific paper

Results are presented on a non-LTE analysis of high-resolution Cassegrain echelle CCD spectra of the four most luminous stars in the NGC 346 cluster in the SMC, obtained with the ESO 3.6-m telescope, making it possible to estimate the age of the NGC 346 cluster and to trace its evolution. The results yield the effective temperatures, gravities, helium abundances, luminosities, and an estimate of ZAMS and present masses. It is shown that the observed stellar parameters are consistent with a cluster age of 2.6 + or - 0.5 Myr.

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