The ultraviolet spectrum of Upsilon Sagittarii

Details The ultraviolet spectrum of Upsilon Sagittarii The ultraviolet spectrum of Upsilon Sagittarii

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71..310d&link_type=abstract

Astronomy and Astrophysics, vol. 71, no. 3, Jan. 1979, p. 310-318. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astronomy

13

Eclipsing Binary Stars, Satellite Observation, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Abundance, Far Ultraviolet Radiation, Frequency Shift, Hydrogen, Limb Darkening, Oao 3, Spectral Line Width, Stellar Evolution, Tables (Data)

Scientific paper

This peculiar binary was observed both by Copernicus and by S 2/68. The spectrum in the region of the Mg II resonance doublet still comes from the star whose spectrum is observed in the visual region, while the far ultraviolet spectrum comes from a hotter object. This is probably the other star, which is in this case at least twice as massive as the former star. The eclipses were detected in the ultraviolet. Their properties may indicate the presence of far ultraviolet limb darkening of the hotter star, while non eclipse related light variations are suggested. The evolution of the system is also discussed.

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