Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..287d&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 3, Oct. 1979, p. 287-291.
Astronomy and Astrophysics
Astrophysics
8
Astronomical Photometry, Astronomical Spectroscopy, Binary Stars, X Ray Sources, X Ray Stars, Balmer Series, H Alpha Line, Luminous Intensity, Stellar Spectrophotometry, Ubv Spectra, Visual Photometry
Scientific paper
A coordinated campaign of simultaneous X-ray and ground-based photometric and spectroscopic observations of X Persei = 3U 0352 + 30 was organized from February 14 to March 2, 1977. The optical observations show little photometric activity, a less marked Balmer excess than in 1971-72, weaker emission than in 1970, and a nearly normal intrinsic color. The H-alpha emission is double with R about equal to V. No clear correlation with the X-ray emission was found, except for the lower intensity probably related to a lower 'activity' of the optical source. A best-fit heliocentric X-ray period of 835.05 + or - 0.15 is found.
Altamore Aldo
Baratta Giovanni Battista
Bunner Alan N.
de Loore Camiel
Divan Lucienne
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