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Title:
X-Ray Spectroscopic Diagnosis of a Wind-Collimated Blast Wave and Metal-Rich Ejecta from the 2006 Explosion of RS Ophiuchi
Authors:
Drake, Jeremy J.; Laming, J. M.; Ness, J.-U.; Orlando, S.; Starrfield, S.; Beardmore, A. P.; Bode, M. F.; Evans, A.; Eyres, S. P. S.; Gehrz, R. D.; Goad, M. R.; Gonzalez-Riestra, R.; Krautter, J.; O'Brien, T. J.; Osborne, J. P.; Page, K. L.; Schwarz, G.; Woodward, C. E.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AB(Space Science Division, Naval Research Laboratory, Code 7674L, Washington, DC 20375, USA ), AC(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA ), AD(Osservatorio Astronomico di Palermo G.S. Vaiana, Piazza del Parlamento 1, 90134 Palermo, Italy ), AE(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA ), AF(Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK ), AG(Astrophysics Research Institute, Liverpool John Moores University, Birkenhead CH41 1LD, UK ), AH(Astrophysics Group, Keele University, Keele ST5 5BG, UK ), AI(Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK ), AJ(Department of Astronomy, School of Physics & Astronomy, 116 Church Street S.E., University of Minnesota, Minneapolis, MN 55455, USA ), AK(Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK ), AL(XMM Science Operations Center, ESAC, P.O. Box 50727, 28080 Madrid, Spain ), AM(Landessternwarte Königstuhl, 69117 Heidelberg, Germany ), AN(Jodrell Bank Observatory, School of Physics & Astronomy, University of Manchester, Macclesfield SK11 9DL, UK ), AO(Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK ), AP(Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK ), AQ(Department of Geology and Astronomy, West Chester University, West Chester, PA 19383, USA), AR(Department of Astronomy, School of Physics & Astronomy, 116 Church Street S.E., University of Minnesota, Minneapolis, MN 55455, USA )
Publication:
The Astrophysical Journal, Volume 691, Issue 1, pp. 418-424 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
shock waves, stars: individual: RS Oph, novae, cataclysmic variables, X-rays: binaries, X-rays: stars
DOI:
10.1088/0004-637X/691/1/418
Bibliographic Code:
2009ApJ...691..418D

Abstract

Chandra HETG observations of RS Ophiuchi at day 13.9 of the 2006 outburst reveal a rich spectrum of emission lines from abundant ions formed over a wide temperature range (~ 3 × 106 to 60 × 106 K) indicative of shock heating of the circumstellar medium by the expanding blast wave. Lines are asymmetric and strongly broadened (v ~ 2400 km s-1 at zero intensity). Using simple analytical model profiles, we show how the lines are shaped by differential absorption in the red giant wind and explosion ejecta, and that shock heating to multimillion degree temperatures appears to have occurred preferentially in the direction perpendicular to the line of sight. We conclude that the asymmetric nature of the offset 1/r 2 density profile and likely equatorial circumstellar density enhancement in which the explosion occurred are responsible for both the shock collimation and broad range in plasma temperature observed. The ejecta mass deduced from X-ray absorption is more easily reconciled with the expected mass accretion rate for material enhanced in metals by up to an order of magnitude.
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