Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..113b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 1, Jan. 1986, p. 113-119. SERC-supported research.
Astronomy and Astrophysics
Astrophysics
36
Chemical Composition, Early Stars, Open Clusters, Stellar Composition, Abundance, Astronomical Photometry, Astronomical Spectroscopy, Atmospheric Models, Main Sequence Stars, Ubv Spectra
Scientific paper
Four color photometric and spectroscopic observations for eight early-type main sequence stars in the cluster NGC 6611 were obtained at the South African and Anglo-Australian observatories. Equivalent widths and line profiles were measured for lines of hydrogen, helium and seven other elements present in the spectra of five stars. Effective temperatures were derived from ionization equilibria while surface gravities were estimated from profiles fitted to H-delta and H-epsilon absorption lines. Abundances, deduced from comparison with LTE and non-LTE model atmosphere calculations are found to be consistent with normal early-type stellar abundances. NGC 6611 lies at a distance of approximately 1 kpc from NGC 6231, whose early-type main sequence stars possibly exhibit an underabundance in nitrogen. Hence the present study implies the possibility of abundance variations over relatively small distance scales.
Brown Paul J. F.
Dufton Philip L.
Keenan Francis P.
Kilkenny Dave
Lennon Daniel J.
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