Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...38..227l&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 38, Nov. 1979, p. 227-238. Research supported by the Nederlandse Commissie v
Astronomy and Astrophysics
Astronomy
3
Astronomical Catalogs, Early Stars, Stellar Spectra, Ultraviolet Astronomy, A Stars, B Stars, F Stars, Iron, Line Spectra, O Stars
Scientific paper
The mid-ultraviolet spectrum of 138 bright early-type stars in both hemispheres is investigated for the purpose of detecting stars with an anomalous spectrum. The study is based on S59 spectra, which have a resolution of 1.8 A in three wavelength bands near 2100, 2500 and 2800 A. The following features turned out to be the most sensitive criteria: an Fe III feature at 2078 A, Fe II at 2549 A, Mg II at 2800 A and the intrinsic color (m2500 - V)0. The predicted (m2500 - V)0 color, based on line-blanketed model atmospheres, agrees with the observations for normal O and B stars but is too bright for the A and F stars by about 0.3 mag. The strength of the Fe II feature increases from type O to F, whereas the strength of the Fe III feature has a maximum near spectral type B1.5. The Beta Cep variables have the same UV color as the normal stars.
Burger Marc
Faraggiana Rosanna
Lamers Henny J. G. L. M.
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