Is M 13 II-67 really oxygen poor?

Details Is M 13 II-67 really oxygen poor? Is M 13 II-67 really oxygen poor?

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..369h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, May 1987, p. 369-373.

Other

15

Abundance, Globular Clusters, Oxygen, Stellar Spectra, Signal To Noise Ratios, Spectral Line Width, Spectral Resolution, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

High-resolution (0.15 A) and high signal-to-noise data for two stars (II-67 and III-56) in M 13 taken with the Hamilton echelle spectrograph and the 3-m telescope at Lick Observatory are presented. Equivalent widths are determined for the O I 6300 A and 6363 A forbidden lines as well as for lines of other ions in this spectral region. Both the oxygen lines in II-67 are weaker than the respective ones in III-56. The equivalent widths suggest that the oxygen abundance in II-67 is deficient by a factor of 3-7 with respect to III-56. These observations confirm the results of a recent study of these objects by Leep, Wallerstein, and Oke (1986).

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