Abundance analyses of main-sequence stars in a possible nitrogen deficient cluster NGC 6231

Details Abundance analyses of main-sequence stars in a possible nitrogen deficient cluster NGC 6231 Abundance analyses of main-sequence stars in a possible nitrogen deficient cluster NGC 6231

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..443l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, May 1983, p. 443-456.

Astronomy and Astrophysics

Astronomy

23

Abundance, Main Sequence Stars, Star Clusters, Stellar Spectrophotometry, Carbon, Early Stars, Helium, Line Spectra, Magnesium, Nitrogen, Oxygen

Scientific paper

24 early-type main-sequence stars were observed at moderate dispersion in the cluster NGC 6231 and atmospheric parameters deduced from their Strömgren photometry and Hγ and Hɛ absorption lines. Equivalent widths were measured for lines of He I, C II, N II, O II and Mg II, and abundances deduced from comparison with LTE and non-LTE model atmosphere calculations. Evidence is found for a systematic nitrogen underabundance of 0.3 to 0.4 dex relative to hydrogen and this is interpreted as being due to a nitrogen deficiency in the progenitor interstellar material. Possible explanations for the anomalous composition are discussed.

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