Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26as...21...81d&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 21, July 1975, p. 81-97. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
14
Balmer Series, Early Stars, H Alpha Line, Reference Stars, Stellar Spectrophotometry, Electrophotometry, H Beta Line, Spectral Line Width, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra, Stellar Structure, Ultraviolet Spectra
Scientific paper
Photoelectric measurements of H-alpha line strengths are presented for 100 early-type stars intended for use as standard stars in a photometric H-alpha system to supplement the H-beta standard system. The measurements were made with two small half-bandwidth interference filters centered on H-alpha, and the stellar spectral types included O, B, A, F, and G0. Several stars with variable H-alpha strengths are noted, and photometric indices of the H-alpha line strengths are compared with those of previously measured H-beta strengths for 94 stars and the spectrophotometric H-alpha indices for 36 stars. It is shown that the value of the H-alpha index is an excellent luminosity criterion for early-type supergiants and heavily reddened OB stars later than about O9, and that it is possible to discriminate between emission-line stars of low luminosity and nonemission stars of high luminosity of the same spectral type by simultaneous measurement of the H-alpha and H-beta indices of OB-type stars. Stars with variable hydrogen-line emission and peculiarities in their spectra may be identified by their location in an alpha-beta plot.
Dachs Joachim
Schmidt-Kaler Theodor
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