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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

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ICV 2018: 120.66

Open Access
Online
ISSN
2543-6376
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Volume 21, Issue 1-2

Issues

News from AG Draconis

L. Leedjärv / M. Burmeister
Published Online: 2017-03-23 | DOI: https://doi.org/10.1515/astro-2017-0367

Abstract

AG Dra is a classical symbiotic star that undergoes major outbursts at intervals between 12-15 years. We present spectroscopic observations of four emission lines (Hα, Hβ, He II 4686 Å, Raman scattered OVI 6825 Å) before, during and after the major outburst that started in 2006. Interesting strengthenings of the emission lines took place in late 2005 and in early 2008. the latter was followed by a very deep minimum in the line strengths in 2008–2009.

Keywords: stars; symbiotic; stars; individual (AG Dra); spectroscopy; emission lines

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About the article

Received: 2011-09-01

Accepted: 2011-09-15

Published Online: 2017-03-23

Published in Print: 2012-06-01


Citation Information: Open Astronomy, Volume 21, Issue 1-2, Pages 131–138, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0367.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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