Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..223g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 223-229. Research supported by NSERC and The Citadel
Astronomy and Astrophysics
Astrophysics
29
Signal To Noise Ratios, Spectral Bands, Stellar Atmospheres, Stellar Spectra, Stellar Spectrophotometry, Early Stars, Metals, Spectrographs, Telescopes
Scientific paper
High dispersion ultrahigh signal to noise Reticon spectra of Vega were obtained with the coude spectrograph of the 1.2 m telescope. A mean signal to noise ratio of 2500 over the spectral region lambdas from 3825 to 5435 was achieved. Examination of the line profiles confirmed the presence of two different types of profiles which were previously seen in IIIaJ and lower signal to noise Reticon spectra. The profiles of the strong lines are essentially classical rotational profiles with enhanced wings which are slightly stronger than expected while those of weak lines are clearly flat-bottomed resulting in a trapezoidal appearance. A few possible theoretical explanations are presented.
Adelman Saul J.
Cowley Charles R.
Fletcher Murray J.
Gulliver Austin F.
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