Is the oxygen-poor giant in M 13 nitrogen rich?

Details Is the oxygen-poor giant in M 13 nitrogen rich? Is the oxygen-poor giant in M 13 nitrogen rich?

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99...15l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Jan. 1987, p. 15-19.

Astronomy and Astrophysics

Astronomy

6

Abundance, Giant Stars, Globular Clusters, Nitrogen, Oxygen, Charge Coupled Devices, Cool Stars, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

Observations of II-67, an oxygen-poor globular-cluster giant in M 13, are reported. Spectra were obtained at 310-470 nm with resolution 6 A FWHM and dispersion 2 A/pixel using a CCD detector and the Miller UV Schmidt Spectrograph on the 3-m Shane telescope at Lick Observatory on June 9-11, 1986. The data are presented in tables and graphs and analyzed, and it is shown (on the basis of comparisons of the 336-nm NH band strength with those of oxygen-normal stars in M 13) that II-67 has a normal nitrogen abundance.

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