Spatially resolved spectra of the accretion disc of the nova-like variable UU Aquarii

R Baptista, C Silveira, JE Steiner, Keith Douglas Horne

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11 Citations (Scopus)

Abstract

Time-resolved spectroscopy of the nova-like variable UU Aquarii is analysed with eclipse mapping techniques to produce spatially resolved spectra of its accretion disc and gas stream as a function of distance from disc centre in the range 3600-6900 Angstrom. The spatially resolved spectra show that the continuum emission becomes progressively fainter and redder for increasing disc radius - reflecting the radial temperature gradient - and reveal that the H I and He I Lines appear as deep, narrow absorption features in the inner disc regions, transitioning to emission with P Cyg profiles for intermediate and large disc radii. The spectrum of the uneclipsed component has strong H I and He I emission lines plus a Balmer jump in emission, and is explained as optically thin emission from a vertically extended disc chromosphere + wind. Most of the line emission probably arises from the wind. The spatially resolved spectra also suggest the existence of gas stream 'disc-skimming' overflow in UU Aqr, which can be seen down to R similar or equal to 0.2R(L1) The comparison of our eclipse maps with those of Baptista, Steiner & Horne suggests that the asymmetric structure in the outer disc previously identified as the bright-spot may be the signature of an elliptical disc similar to those possibly present in SU UMa stars during superoutbursts.

Original languageEnglish
Pages (from-to)pp.713-726.
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume314
Issue number4
Publication statusPublished - 1 Jun 2000

Keywords

  • accretion, accretion discs
  • binaries : close
  • binaries : eclipsing
  • stars : individual : UU Aqr
  • novae, cataclysmic variables
  • UX-URSAE-MAJORIS
  • ECLIPSE MAPPING METHOD
  • CATACLYSMIC VARIABLES
  • MULTICOLOR ECLIPSE
  • SPECTROSCOPY
  • BINARIES
  • STREAM
  • STARS
  • WIND

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