Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..664b&link_type=abstract
Astronomy Reports, vol. 50, Issue 8, p.664-678
Astronomy and Astrophysics
Astronomy
12
Pacs Numbers 97.30.Eh, 97.80.Jp
Scientific paper
Our long-time monitoring of the B[e] star and transient X-ray source CI Cam during quiescence following the 1998 outburst demonstrates that the complex, stratified circumstellar envelope has tended to stabilize after this structure was perturbed by the passage of a shock wave from the outburst. The star’s U BV R brightness shows slow, possibly cyclic, variations with an amplitude of about 0.2m. We determined the spectral type of the primary, B4III-V, based on the widths of the absorption wings of high-numbered Balmer lines. A Doppler shift of 460 km/s was detected for the Hell λ4686 Å emission line. The shifts in this line yield an orbital period of 19.41 days, which is also manifested itself in the photometric data as a wave with a V amplitude of 0.034m. The orbit is elliptical, with an eccentricity of 0.62. It is most likely that the secondary is a white dwarf surrounded by an accretion disk. The primary’s mass exceeds 12 M &sun; . The system may be at a late stage of its evolution, after the stage of mass exchange.
Barsukova Elena A.
Borisov N. V.
Burenkov Alexander N.
Goranskii V. P.
Klochkova Valentina G.
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