Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
---|---|---|
Page(s) | 599 - 605 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20035751 | |
Published online | 17 December 2004 |
Spectroscopic monitoring of the transition phase in nova V4745 Sgr*
1
Department of Experimental Physics and Astronomical Observatory, University of Szeged, Dóm tér 9, 6720 Szeged, Hungary e-mail: csakb@physx.u-szeged.hu
2
School of Physics, University of Sydney 2006, Australia
3
Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802-6305, USA
4
School of Physics and Astronomy and the Wise Observatory, Tel Aviv University, Tel Aviv 69978, Israel
Received:
26
November
2003
Accepted:
6
August
2004
We present a spectroscopic monitoring of the transient nova
V4745 Sagittarii (Nova Sgr 2003 #1) covering ten months after its
discovery. During this period the light curve showed a well expressed
transient phase in the form of six rebrightenings, and the presented
dataset is one of the best spectroscopic coverages of a classical nova
during the transition phase. Low- and medium-resolution spectra
revealed that the majority of spectral lines switched back to strong
P-Cyg profiles during the mini-outbursts, similar to the spectra just
after the major eruption. We interpret the observed phenomena as
evidence for “echo-outbursts” resulting in episodes of secondary
mass-ejections and propose that the transition phase in classical
novae is driven by repetitive instabilities of the hydrogen shell
burning on the surface of the white dwarf. From the available light
curve data we estimate the absolute magnitude of the system of about
. All spectrophotometric evidence point toward a very
low (
) interstellar reddening, leading to a rough
distance estimate of V4745 Sgr (
).
Key words: novae, cataclysmic variables / stars: individual: V4745 Sgr
© ESO, 2005
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