Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session M2: Neutron Stars |
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Sponsoring Units: DNP DAP Chair: Hendrik Schatz, Michigan State University Room: Marriott Tampa Waterside Grand Salon F |
Sunday, April 17, 2005 3:15PM - 3:51PM |
M2.00001: Gravitational Redshift Measurement of a Neutron Star Invited Speaker: |
Sunday, April 17, 2005 3:51PM - 4:27PM |
M2.00002: Limits to Neutron Star Spin Invited Speaker: Over the past decade our understanding of accreting neutron stars has been revolutionized. Observations with NASA's Rossi X-ray Timing Explorer (RXTE) have resulted in the discovery of fast, coherent X-ray intensity oscillations (hereafter, ``burst oscillations'') during thermonuclear X-ray bursts from 13 low mass X-ray binaries (LMXBs). Although many of their detailed properties remain to be fully understood, it is now beyond doubt that these oscillations result from spin modulation of the thermonuclear burst flux from the neutron star surface. In addition, RXTE observations led to the discovery of the first accreting millisecond pulsars, the sample of which now includes six systems, several of which are in extremely compact binary systems with essentially massive planet companions. These millisecond timing phenomena are providing powerful new probes of the formation, evolution and structure of neutron stars. I will describe recent efforts to constrain neutron star structure using detailed modelling of their properties. I will also discuss what the observed distribution of neutron star spin frequencies is telling us about the torques which may act to limit the ultimate spin up of accreting neutron stars. [Preview Abstract] |
Sunday, April 17, 2005 4:27PM - 5:03PM |
M2.00003: Constraining neutron star matter with laboratory experiments Invited Speaker: While measurements of nucleus-nucleus collisions have provided significant constraints on the equation of state of symmetric nuclear matter, there are currently no good constraints on the asymmetry term in the nuclear EOS. These constraints are relevant to the understanding of neutron rich astrophysical objects. Heavy ion collisions, which create nuclear matter over a range of density provide an opportunity to study the density dependence of nuclear symmetry energy. The status of present investigations mostly with stable beams will be reviewed. With the development of new facilities for producing energetic rare isotope beams especially those with extreme isospin composition, prospects for future measurements in this area will also be explored. This work is supported by the Nuclear Science Foundation Grant No. NSF-PHY-01-10253. [Preview Abstract] |
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