Issue |
A&A
Volume 405, Number 2, July II 2003
|
|
---|---|---|
Page(s) | 663 - 676 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20030390 | |
Published online | 19 June 2003 |
Variability of The Old Nova V603 Aquilae in UV and X-ray bands
1
Astronomical Observatory of Adam Mickiewicz University, Sloneczna 36, 60-286 Poznan, Poland
2
Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland e-mail: alex@camk.edu.pl
3
Department of Astronomy, University of Washington, Seattle, WA 98195, USA e-mail: szkody@astro.washington.edu
Corresponding author: A. Schwarzenberg-Czerny, bori@moon.astro.amu.edu.pl
Received:
5
July
2002
Accepted:
7
March
2003
We present the results of a campaign of simultaneous
observations of V603 Aql in the X-ray and UV bands accomplished
with the IUE and ROSAT satellites. Simultaneous observations
cover 20 orbital cycles, while the total span of all the observations is 40
cycles. This constitutes
the longest continuous UV time series of simultaneous
space observations of a cataclysmic variable. As all high energy
radiation is ultimately powered by accretion, it is perhaps
remarkable that we observe some signs of correlations of the UV
line and continuum emission with the X-ray flux at zero lag, but
none over a range of time lags from . A hint of
some lagged correlation was revealed for UV color and X-ray flux.
We detect a very strong modulation of intensity of the UV lines of
CIV and SiIV. The modulation appears coherent over the range of
observation and its period of
is consistent with the
spectroscopic orbital period but differs significantly from the
period of photometric modulation. Furthermore, we observe variable
P-Cygni profiles of the CIV1550 line. Its absorption and emission
components are modulated with the orbital period of the binary.
These data present evidence for sustained asymmetry of the
supersonic wind excited from the accretion disc yet pose
difficulties for the current disc and wind models. Since no
periodic modulation was found in the X-ray band nor in the UV
continuum, the present data do not lend support to our earlier
classification of V603 Aql as an intermediate polar.
Key words: accretion, accretion disks / stars: individual: V603 Aql / novae, cataclysmic variables / stars: winds, outflows / ultraviolet: stars / techniques: image processing
© ESO, 2003
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