The discovery of a massive white dwarf in the peculiar binary system HD 49798/RX J0648.0-4418

被引：1
|
作者：
Mereghetti, S. [1 ]
Tiengo, A. [1 ]
Esposito, P. [1 ,2 ]
La Palombara, N. [1 ]
Israel, G. L. [3 ]
Stella, L. [3 ]
机构：
[1] INAF IASF Milano, VE Bassini 15, I-20133 Milan, Italy
[2] INFN Pavia, I-27100 Pavia, Italy
[3] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy
来源：
X-RAY ASTRONOMY-2009: PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES, PROCEEDINGS | 2010年 / 1248卷
关键词：
White dwarfs; Type Ia SNe; Hot subdwarfs; Common envelope evolution; RAY PULSATING COMPANION; SUBDWARF;
D O I：
10.1063/1.3475362
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An XMM-Newton observation performed in May 2008 has confirmed that the 13 seconds pulsations in the X-ray binary HD 49798/RX J0648.0-4418 are due to a rapidly rotating white dwarf. From the pulse time delays induced by the 1.55 days orbital motion, and the system's inclination, constrained by the duration of the X-ray eclipse discovered in this observation, we could derive a mass of 1.28 +/- 0.05 M-circle dot for the white dwarf. The future evolution of this post common envelope binary system will likely involve a new phase of mass accretion through Rochelobe overflow that could drive the already massive white dwarf above the Chandrasekhar limit and produce a Type Ia supernova.
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页码：85 / +
页数：2
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