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 |