Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b)

被引：21

作者：

Ibarra, A. ^{[1
]}

Kuulkers, E. ^{[1
]}

Osborne, J. P. ^{[2
]}

Page, K. ^{[2
]}

Ness, J. U. ^{[1
]}

Saxton, R. D. ^{[1
]}

Baumgartner, W. ^{[3
]}

Beckmann, V. ^{[4
,5
]}

Bode, M. F. ^{[6
]}

Hernanz, M. ^{[7
]}

Mukai, K. ^{[8
,9
]}

Orio, M. ^{[10
,11
]}

Sala, G. ^{[12
]}

Starrfield, S. ^{[13
]}

Wynn, G. A. ^{[2
]}

机构：

[1] ESAC, ESA, Madrid 28691, Spain

[2] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[3] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA

[4] ISDC Data Ctr Astrophys, CH-1290 Versoix, Switzerland

[5] Univ Geneva, Astron Observ, CH-1290 Sauverny, Switzerland

[6] Liverpool John Moores Univ, Astroph Res Inst, Birkenhead CH41 1LD7, Merseyside, England

[7] CSIC, IEEC, Fac Ciencies, Bellaterra 08193, Spain

[8] NASA, Goddard Space Flight Ctr, CRESST, Greenbelt, MD 20771 USA

[9] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[10] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[11] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[12] Univ Politecn Cataluna, Dept Fis & Engn Nucl, Grp Astron & Astrofis, Barcelona 08036, Spain

[13] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 497卷 / 01期

关键词：

X-rays: binaries; novae; cataclysmic variables; AM-HERCULIS; EMISSION; INTEGRAL/IBIS; BAT;

D O I：

10.1051/0004-6361/200911710

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Classical novae are phenomena caused by explosive hydrogen burning onto an accreting white dwarf. Only one classical nova had been identified in X-rays before the actual optical outburst occurred (V2487 Oph). The recently discovered nova, V2491 Cyg, is one of the fastest (He/N) novae observed to date. Using archival ROSAT, XMM-Newton, and Swift data, we show that V2491 Cyg was a persistent X-ray source during its quiescent time before the optical outburst. We present the X-ray spectral characteristics and derive X-ray fluxes. The pre-outburst X-ray emission is variable, and, at least in one observation, it exhibits a soft X-ray source.

引用

页码：L5 / L8

页数：4

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