Possible accretion disk in DL Cygni system?

G. Djurašević, H. Rovithis-Livaniou, P. Rovithis, T. Borkovits, I. B. Biró

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The new V and R light curves of the early-type eclipsing binary DL Cyg, obtained at Baja Observatory in 1998, were re-analyzed. The reason for this is that the light curves of the system are highly asymmetric: there is a systematic difference between the brightness in the two quadratures, and the curves seem to be depressed on the ingress of the primary eclipses. A previous analysis, presented in 1999, explained the unusual light curves and color indices of DL Cyg, assuming the existence of circumstellar material in this strongly interacting semi-detached system. The present analysis is based on the assumption of the presence of an accretion disk around the hotter primary component and an intensive mass transfer. The cooler secondary star, which has filled its Roche lobe, transfers matter into the Roche lobe of the hotter primary. Due to the gas stream flowing from the secondary, an accretion disk, located around the hotter primary in the orbital plane of the system, is formed. On the disk's lateral side, in the zone where the gas stream falls onto the disk, there is an intensive hot-spot radiation. Another active region (bright spot) on the disk edge (near the outer Lagrange point L3), can be explained either by some ellipticity of the disk or by a region from which the system loses matter into space. The disk parameters with active regions (hot and bright spot), as well as the elements of the two components of the system, were computed and presented.

Original languageEnglish
Pages (from-to)517-521
Number of pages5
JournalNew Astronomy
Volume10
Issue number6
DOIs
Publication statusPublished - Jun 2005

Fingerprint

accretion disks
accretion
light curve
gas streams
lobes
Observatories
Gases
gas
Stars
hot spot
mass transfer
Luminance
Mass transfer
observatory
Color
Radiation
eclipses
ellipticity
coolers
quadratures

Keywords

  • Accretion
  • Accretion discs
  • Binaries: eclipsing
  • Stars: individual: DL Cyg
  • Stars: mass-loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Djurašević, G., Rovithis-Livaniou, H., Rovithis, P., Borkovits, T., & Biró, I. B. (2005). Possible accretion disk in DL Cygni system? New Astronomy, 10(6), 517-521. https://doi.org/10.1016/j.newast.2005.03.004

Possible accretion disk in DL Cygni system? / Djurašević, G.; Rovithis-Livaniou, H.; Rovithis, P.; Borkovits, T.; Biró, I. B.

In: New Astronomy, Vol. 10, No. 6, 06.2005, p. 517-521.

Research output: Contribution to journalArticle

Djurašević, G, Rovithis-Livaniou, H, Rovithis, P, Borkovits, T & Biró, IB 2005, 'Possible accretion disk in DL Cygni system?', New Astronomy, vol. 10, no. 6, pp. 517-521. https://doi.org/10.1016/j.newast.2005.03.004
Djurašević G, Rovithis-Livaniou H, Rovithis P, Borkovits T, Biró IB. Possible accretion disk in DL Cygni system? New Astronomy. 2005 Jun;10(6):517-521. https://doi.org/10.1016/j.newast.2005.03.004
Djurašević, G. ; Rovithis-Livaniou, H. ; Rovithis, P. ; Borkovits, T. ; Biró, I. B. / Possible accretion disk in DL Cygni system?. In: New Astronomy. 2005 ; Vol. 10, No. 6. pp. 517-521.
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