New Findings Supporting the Presence of Several Distinct Structures of Circumstellar Matter in β Lyr?

Details New Findings Supporting the Presence of Several Distinct Structures of Circumstellar Matter in β Lyr? New Findings Supporting the Presence of Several Distinct Structures of Circumstellar Matter in β Lyr?

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..205c&link_type=abstract

Binary Stars as Critical Tools & Tests in Contemporary Astrophysics, Proceedings of IAU Symposium #240, held 22-25 August, 2006

Astronomy and Astrophysics

Astrophysics

Scientific paper

Introduction: Understanding large-scale mass exchange in binaries mainly requires studies of complicated objects in the rapid phases of the process. Beta Lyr is one of such objects. Methods: 52 photographic and 651 electronic spectra of beta Lyr were analyzed to obtain additional information about circumstellar matter. (1) The spectra were disentangled using the KOREL program. (2) Spectrophotometric quantities of 15 stronger absorption lines of the Roche lobe filling star were measured and corrected for the orbital continuum variations using the fluxes calculated from a fit of the light curves with the BINSYN program. Results: (1) Disentangling of photographic and electronic spectra led to the detection of weak absorption lines originating from the pseudophotosphere of the accretion disc. This way, a rich line spectrum of the accretion disc, not limited to only two previously known Si6347 and Si6371 lines, was obtained. A projected rotational velocity of 180 km/s was estimated for the disc spectrum. Such a value agrees well with the assumption of the Keplerian rotation of the outer layers of the accretion disc. (2) After the correction, a pronounced increase of the strength of all absorption lines around phases of the primary eclipse was found. We argue that this is due to additional absorption of the light of the primary in one of the jets and/or scattering envelope above the accretion disc of the accretor. Discussion: All new findings support the current picture that the circumstellar structures of beta Lyr consist of a thick accretion disc, bipolar jets and a scattering envelope above the disk.

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