Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..842a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, July 1990, p. 842-845. Research supported by The C
Astronomy and Astrophysics
Astrophysics
10
Charge Coupled Devices, Photographic Plates, Spectrographs, Gratings, Spectrograms, Stellar Spectrophotometry
Scientific paper
Spectra of field horizontal-branch A stars obtained with the coude feed telescope of the KPNO are compared with coadded spectrograms derived from the 2.4-m coude camera of the Dominion Astrophysical Observatory (DAO) in order to study variations in equivalent width for the same star. The KPNO and DAO data are also compared with the observations of Adelman and Hill (1987). It is observed that the SNRs are between 100-240 for the CCD images, 140 for the 6.8 A/mm coadditions, and 180 for the 2.4 A/mm coadditions, and that there is a 14 percent systematic difference in the equivalent widths. Factors which may affect the equivalent-width scale are discussed.
Adelman Saul J.
Davis Philip A. G.
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