Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202.1221r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Mar. 1983, p. 1221-1232.
Astronomy and Astrophysics
Astronomy
45
Binary Stars, Line Spectra, Radiant Flux Density, Stellar Spectrophotometry, Ultraviolet Astronomy, Carbon, Emission Spectra, Iue, Optical Data Processing, Spectral Resolution, Stellar Atmospheres, Ultraviolet Spectra, X Ray Spectra
Scientific paper
IUE (International Ultraviolet Explorer) low-resolution SWP images of the contract binaries 44i Boo, VW Cep, W UMa, V566 Oph, AW UMa, V502 Oph, Epsilon CrA, RR Cen and the very close non-contact binary ER Vul have been studied. The results are compared with other UV and soft X-ray data and it is found that the stellar activity within this group is quite similar to solar activity but much more intense; the higher the general level of activity, the higher are the excitation energies that are seen, except that the soft X-ray emission of the W UMa stars does not conform to this picture. The ultraviolet chromospheric and transition-region normalized line fluxes are not very sensitive to spectral type and orbital period among W UMa stars. However, a small weakening towards earlier spectral types is evident. The far ultraviolet chromospheric and transition-region activity seems to level off towards short periods; for soft X-rays the coronal radiation of contact binaries is actually weaker than for detached binaries with somewhat longer periods. The C IV emission variations with phase in 44i Boo have been also analyzed.
Rucinski Slavek M.
Vilhu Osmi
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