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Nebula around R Corona Borealis

Published online by Cambridge University Press:  30 August 2012

N. Kameswara Rao  and
David L. Lambert
N. Kameswara Rao
Affiliation:
The W. J. McDonald Observatory, The University of Texas, Austin, USA Instituto de Astrofsica de Canarias, IAC. La Laguna, Tenerife, Spain
David L. Lambert
Affiliation:
The W. J. McDonald Observatory, The University of Texas, Austin, USA
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Abstract

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The star R Corona Borealis (R CrB) shows forbidden lines of [O II], [N II], and [S II] during the deep minimum when the star is fainter by about 8 to 9 magnitudes from normal brightness, suggesting the presence of nebular material around it. We present low and high spectral resolution observations of these lines during the ongoing deep minimum of R CrB, which started in July 2007. These emission lines show double peaks with a separation of about 170 km/s. The line ratios of [S II] and [O II] suggest an electron density of about 100 cm−3. We discuss the physical conditions and possible origins of this low density gas. These forbidden lines have also been seen in other R Coronae Borealis stars during their deep light minima and this is a general characteristic of these stars, which might have some relevance to their origins.

Keywords

stars: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 476 - 477
Copyright
Copyright © International Astronomical Union 2012