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.

引用

页码：85 / +

页数：2

共 36 条

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Mereghetti, S.
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ASTROPHYSICAL JOURNAL, 2011, 737 (02):
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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2021, 504 (01) : 920 - 925
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Departamento de Astronomia, Universidad de Chile, Camino del Observatorio 1515, Santiago, Chile
不详
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Mon. Not. R. Astron. Soc., 2 (705-716):
[8] Discovery of a T dwarf plus white dwarf binary system
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INTERNATIONAL CONFERENCE ON BINARIES: IN CELEBRATION OF RON WEBBINK'S 65TH BIRTHDAY, 2010, 1314 : 256 - +
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Schreiber, MR
Dhillon, VS
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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 355 (04) : 1143 - 1154

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