Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..266p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 266-281.
Other
21
Abundance, Astronomical Photometry, Giant Stars, Stellar Spectra, Stellar Spectrophotometry, Echelle Gratings, Globular Clusters, Interstellar Extinction, Metallicity
Scientific paper
Photometry and measurements of equivalent widths are presented for nine extremely metal-poor stars, including two in the globular cluster M92. Reddening estimates are evaluated in depth. An extensive intercomparison is presented of equivalent widths derived here and by various other authors for the same stars. With the echelle spectrograph, long-focus camera, and TEK CCD data, widths from 2 to 20 mA are measured to + or - 2 mA for a star with V = 6, and widths from 12 to 50 mA are measured to + or - 10 mA for a star with V = 12. Photographic image-tube echelle data produced widths good to + or - 10 mA over 10-100 mA from two plates. It is shown that the nickel overabundance deduced for the most extremely metal poor stars by Luck and Bond (1985) may arise from their overestimate of equivalent widths of weak lines at the limit of detectability.
Carney Bruce W.
Peterson Ruth C.
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