Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..661h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 661-668.
Astronomy and Astrophysics
Astronomy
6
Atomic Energy Levels, Infrared Spectra, Oxygen Spectra, Photodiodes, Spectral Line Width, Stellar Spectrophotometry, Supergiant Stars, A Stars, G Stars, Line Spectra, Linear Arrays, Nonequilibrium Thermodynamics, Stellar Spectra
Scientific paper
Partially resolved spectra of the infrared oxygen triplet in A-G supergiants have been obtained with a new self-scanned photodiode array system. Curve of growth analyses indicate that the lines are formed in non-LTE. A line is identified at 7777.9 A which is strong in A supergiants and which will complicate the analysis of low resolution spectra. At a resolution of 0.45 A/diode the CN lines which appear in G8 and later stars are blended with the O I triplet rendering its equivalent width unreliable as a luminosity indicator.
Hopkinson Gordon R.
Humrich A.
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