evolutionary link between x-ray pulsars and millisecond radio pulsars
DESCRIPTION
Evolutionary Link between X-ray Pulsars and Millisecond Radio Pulsars. 李向东 南京大学天文学系 2009-7-30. Radio Pulsars -Rotation Powered. X-ray Pulsars -Accretion Powered. HMXBs. LMXBs. The Recycled Scenario. Spin Periods. X-ray pulsars. Millisecond X-ray Pulsars. Binary Pulsar Population. - PowerPoint PPT PresentationTRANSCRIPT
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Evolutionary Link between X-ray Pulsars and Millisecond Radio
Pulsars
李向东南京大学天文学系
2009-7-30
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Radio Pulsars-Rotation Powered
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X-ray Pulsars-Accretion Powered
LMXBsHMXBs
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The Recycled Scenario
X-ray pulsars
Spin Periods
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Millisecond X-ray Pulsars
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Main type Sub-typeObservational examples
Recycled PSR + low-mass comp.(MC≤ 0.45M⊙)
PSR + (He) WDPSR J0437-4715PSR J1640+2224
Mildly recycled PSR + high-mass compact comp.(0.5≤MC/M⊙≤1.4)
1. PSR + NS (double)2. PSR + (ONeMg) WD3. PSR + (CO) WD
1. PSR B1913+162. PSR J1435-61003. PSR J2145-0750
Non-recycled pulsar (CO) WD + PSR PSR B2303+46
Un-evolved companion1. PSR + B-type comp.2. PSR + low-mass MS
comp.
1. PSR B1259-632. PSR B1820-11
Binary Pulsar Population
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Binary Pulsar Population
Breton 2009
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Stellar Evolution
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Stellar Evolution
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Evolution of HMXBs• Unstable mass transfer and common
Envelope evolution
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Evolution of LMXBs
• Nuclear evolution• Mass and angular momentum loss
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Form
ation Channel (1)
Single NS
TZO
TZO
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Form
ation Channel (2)
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Observations vs. Theories
Deloye 2008
Too long Porb or too small M2?
Black widow pulsars?
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Problems with LMXB Evolution
• The formation of LMXBs requires a contrived evolution with– extreme initial mass ratio– ejection of a massive common envelope by a l
ow-mass star– survival as a bound system after the SN
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Problems with LMXB Evolution
• Birthrate problem (Kulkarni & Narayan 1988)– NLMXB ~ 100, τLMXB ~ 10^9 yr– NBMSP ~ 10^5, τBMSP ~ 10^9-10^10 yr– NBMSP /τBMSP ~ 10-100 NLMXB /τLMXB
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Problems with LMXB Evolution
• Mass and angular momentum loss
Andronov et al. (2001) Lattimer (2007)
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Problems with LMXB Evolution
• Luminosity distribution
Podsiadlowski et al. 2002
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PSR J1903+0327
• In the Galactic plane
• Ps=2.15 ms
Porb=95 days
• Mpsr~1.74 Msun
• M2~1 Msun
• e = 0.44!