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Nebula around R Corona Borealis

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dc.contributor.author Kameswara Rao, N
dc.contributor.author Lambert, David L
dc.date.accessioned 2020-11-10T01:38:31Z
dc.date.available 2020-11-10T01:38:31Z
dc.date.issued 2012-08-30
dc.identifier.citation Manchado, A., Stanghellini, L & Sch¨onberner,D. eds. Planetary Nebulae: An Eye to the Future, Proceedings IAU Symposium No. 283, August 30 2012, pp. 476-477 en
dc.identifier.issn 1743-9221
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6682
dc.description Restricted Access en
dc.description.abstract 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. en
dc.language.iso en en
dc.publisher International Astronomical Union en
dc.relation.ispartofseries International Astronomical Union Symposium;283
dc.relation.uri http://dx.doi.org/10.1017/S1743921312012008 en
dc.rights © International Astronomical Union en
dc.subject Stars: general en
dc.title Nebula around R Corona Borealis en
dc.type Article en


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