Stellar studies in the balloon ultraviolet

Details Stellar studies in the balloon ultraviolet Stellar studies in the balloon ultraviolet

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..379b&link_type=abstract

(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop

Astronomy and Astrophysics

Astronomy

4

Balloon-Borne Instruments, Line Spectra, Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectroscopy, B Stars, Early Stars, Stellar Temperature, Tables (Data), Velocity Distribution

Scientific paper

Observations with a spectral resolution of 0.01 nm have been made for several stars in the balloon ultraviolet. For the two coolest stars studied (beta Ori and alpha Lyr), wavelengths of all observed spectral features in the range from 273 to 288 nm are given with an accuracy of approximately 0.004 nm either way. Using these results, the velocity field in the atmosphere of beta Ori has been investigated, and evidence is found for an outward motion in the higher layers as well as a pulsation-type motion in the deepest layers. The strength of the Mg(+) resonance and subordinate lines near 280 nm for all the stars observed is compared with non-LTE calculations. Good agreement between observation and theory is found for main sequence stars, but the stronger lines in the supergiants imply microturbulent velocities in excess of 10 km/s.

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