SALT observations of southern post-novae

SALT observations of southern post-novae

Aims. We report on recent optical observations of the stellar and the nebular remnants of 22 southern post-novae. Methods. In this study, for each of our targets, we obtained and analysed long-slit spectra in the spectral range 3500–6600 Å and in Hα+[N ii] narrow-band images. Results. The changes in...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2015-04, Vol.576, p.A119
Hauptverfasser: Tomov, T., Swierczynski, E., Mikolajewski, M., Ilkiewicz, K.
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Sprache:eng
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Astronomy
cataclysmic variables
Ejection
Emission
Equivalence
Nebulae
novae
Outbursts
Power law
Spectra
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container_issue
container_start_page A119
container_title Astronomy and astrophysics (Berlin)
container_volume 576
creator Tomov, T.
Swierczynski, E.
Mikolajewski, M.
Ilkiewicz, K.
description Aims. We report on recent optical observations of the stellar and the nebular remnants of 22 southern post-novae. Methods. In this study, for each of our targets, we obtained and analysed long-slit spectra in the spectral range 3500–6600 Å and in Hα+[N ii] narrow-band images. Results. The changes in the emission lines’ equivalent widths with the time since the outburst agree with earlier published results of other authors. We estimated an average value α = 2.37 for the exponent of the power law fitted to the post-novae continua. Our observations clearly show the two-component structure of the V842 Cen expanding nebulae, owing to the different velocities of the ejected matter. We discovered an expanding shell around V382 Vel with an outer diameter of about 12″.
doi_str_mv 10.1051/0004-6361/201424709
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We report on recent optical observations of the stellar and the nebular remnants of 22 southern post-novae. Methods. In this study, for each of our targets, we obtained and analysed long-slit spectra in the spectral range 3500–6600 Å and in Hα+[N ii] narrow-band images. Results. The changes in the emission lines’ equivalent widths with the time since the outburst agree with earlier published results of other authors. We estimated an average value α = 2.37 for the exponent of the power law fitted to the post-novae continua. Our observations clearly show the two-component structure of the V842 Cen expanding nebulae, owing to the different velocities of the ejected matter. 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subjects Astronomy
cataclysmic variables
Ejection
Emission
Equivalence
Nebulae
novae
Outbursts
Power law
Spectra
title SALT observations of southern post-novae
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