Orbital and stochastic far-ultraviolet variability in the nova-like system V3885 Sgr
| Autor: | L. W. Peck, Raman K. Prinja, Knox S. Long, M. T. Richards, D. K. Witherick |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Absorption spectroscopy Accretion (meteorology) 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Cataclysmic variable star Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Spectral line symbols.namesake Space and Planetary Science 0103 physical sciences symbols Astrophysics::Solar and Stellar Astrophysics Outflow Absorption (electromagnetic radiation) 010303 astronomy & astrophysics Doppler effect Astrophysics::Galaxy Astrophysics Line (formation) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 419:3537-3546 |
| ISSN: | 0035-8711 |
| DOI: | 10.1111/j.1365-2966.2011.19992.x |
| Popis: | Highly time-resolved time-tagged FUSE satellite spectroscopic data are analysed to establish the far-ultraviolet (FUV) absorption line characteristics of the nova-like cataclysmic variable binary, V3885 Sgr. We determine the temporal behaviour of low (Lyβ, C iii, N iii) and high (S iv, P v, O vi) ion species, and highlight corresponding orbital phase modulated changes in these lines. On average, the absorption troughs are blueshifted due to a low-velocity disc wind outflow. Very rapid (∼5 min) fluctuations in the absorption lines are isolated, which are indicative of stochastic density changes. Doppler tomograms of the FUV lines are calculated which provide evidence for structures where a gas stream interacts with the accretion disc. We conclude that the line depth and velocity changes as a function of orbital phase are consistent with an asymmetry that has its origin in a line-emitting, localized disc–stream interaction region. |
| Databáze: | OpenAIRE |
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