X-RAY SPECTROSCOPIC DIAGNOSIS OF A WIND-COLLIMATED BLAST WAVE AND METAL-RICH EJECTA FROM THE 2006 EXPLOSION OF RS OPHIUCHI

被引:32
作者
Drake, Jeremy J. [1 ]
Laming, J. M. [2 ]
Ness, J-U [3 ]
Orlando, S. [4 ]
Starrfield, S. [3 ]
Beardmore, A. P. [5 ]
Bode, M. F. [6 ]
Evans, A. [7 ]
Eyres, S. P. S. [8 ]
Gehrz, R. D. [9 ]
Goad, M. R. [5 ]
Gonzalez-Riestra, R. [10 ]
Krautter, J. [11 ]
O'Brien, T. J. [12 ]
Osborne, J. P. [5 ]
Page, K. L.
Schwarz, G. [13 ]
Woodward, C. E. [9 ]
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA
[3] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[4] Osservatorio Astron Palermo GS Vaiana, I-90134 Palermo, Italy
[5] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[6] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
[7] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
[8] Univ Cent Lancashire, Ctr Astrophys, Preston PR1 2HE, Lancs, England
[9] Univ Minnesota, Dept Astron, Sch Phys & Astron, Minneapolis, MN 55455 USA
[10] ESAC, XMM Sci Operat Ctr, Madrid 28080, Spain
[11] Landessternwarte Konigstuhl, D-69117 Heidelberg, Germany
[12] Univ Manchester, Jodrell Bank Observ, Sch Phys & Astron, Macclesfield SK11 9DL, Cheshire, England
[13] W Chester Univ, Dept Geol & Astron, W Chester, PA 19383 USA
关键词
shock waves; stars: individual (RS Oph); novae; cataclysmic variables; X-rays: binaries; X-rays: stars; 1985; OUTBURST; SWIFT OBSERVATIONS; ATOMIC DATABASE; SYMBIOTIC STARS; EMISSION-LINES; MASS ACCRETION; SHOCK-WAVE; ABUNDANCES; SYSTEMS; NEBULAE;
D O I
10.1088/0004-637X/691/1/418
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 (similar to 3 x 10(6) to 60 x 10(6) K) indicative of shock heating of the circumstellar medium by the expanding blast wave. Lines are asymmetric and strongly broadened (v similar to 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.
引用
收藏
页码:418 / 424
页数:7
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