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Science 8 December 1967:
Vol. 158. no. 3806, pp. 1273 - 1279
DOI: 10.1126/science.158.3806.1273
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Articles

Ultraviolet Spectra of Stars

The ultraviolet spectra of stars are discussed from both theoretical and observational viewpoints

Anne B. Underhill 1 and Donald C. Morton 2

1 University of Utrecht, The Netherlands
2 Princeton University Observatory

According to theories of model stellar atmospheres only stars of spectral types from O to about B3 may be expected to be bright in the ultraviolet-wavelength region. Observations of the strong resonance lines between 911.6 and 1900 Å will yield new information permitting construction of better models for the outermost layers of OB stars. However, an adequate theory of line-formation, including non-l.t.e. effects, should be used if an accurate physical representation is to result. Already it has been demonstrated beyond doubt that O and B0 supergiants are surrounded by expanding atmospheres.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)