Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157...59g&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Binary Stars, Iue, Ultraviolet Astronomy, Emission Spectra, Light (Visible Radiation), Magnesium, Spectra, Stellar Luminosity
Scientific paper
Some UV spectra of sigma Gem are discussed. The ground-based observations include medium dispersion (40 A/mm) optical spectra and UBV photoelectric photometry. The binary system belongs to the long-period group. The width at the base of the K line of Mg II was found to correspond to 430 + or - 20 km/s, implying a value Msubv=-4.9 + or - 0.3. This improbably large luminosity for a Ki III star indicates that the Weiler-Oegele relation does not work in this case. The short wavelength low resolution International Ultraviolet Explorer spectra show the strong activity of the system. The long wavelength spectrum shows only the resolved Mg doublet and a trace of rising continuum at the long wavelength end. Ground based UBV data are in agreement with other observations.
Bartolini Corrado
Giangrande A.
Giovannelli Franco
Guadenzi S.
Guarnieri Adriano
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