in this lecture we look at: 1) neutron stars in x-ray binaries 2) mass-radius relationship
DESCRIPTION
In this lecture we look at: 1) Neutron stars in x-ray binaries 2) Mass-radius relationship 3) Strange star candidates 4) Quark deconfinement at T=0 5) Astrophysical signals of quark matter. Alfen radius. RXJ 1856.5-3754. Drake et al. point out that this NS may in fact be a quark star - PowerPoint PPT PresentationTRANSCRIPT
In this lecture we look at:
1) Neutron stars in x-ray binaries
2) Mass-radius relationship
3) Strange star candidates
4) Quark deconfinement at T=0
5) Astrophysical signals of quark matter
Alfen radius
RXJ 1856.5-3754
Drake et al. point out that this NS may in fact be a quark star(astro-ph/0204159) because of its small radius, which theyargue is in the range between
R = 3.8 and 8.2 km!!
Nasa press release of 10 April 2002:"Cosmic x-rays reveal evidence for new form of matter"WWW.msfc.nasa.gov/news
T=7x105 K (60 eV)
R= R (1-2M/R)-1/2
f (D/120 pc) km
Star's x-ray spectrumis well represented bya black body with a temperature of
The observed x-ray fluxand temperature correspond to a stellarradius of
R=3.8 to 8.2 km
Drake et al.:
Rotationally deformed, rotating neutron star
Pulsar 3C58
A 65 ms pulsar (J0205+6449) was discovered by Murray et al. (to appear in the ApJ, 2002).
This pulsar is at the center of 3C58, a young Crab-like supernova remnant (SN 1181). Thus 3C58 is somewhat younger than Crab.
The pulsar's surface temperature is 1.12x106 K (Slane, Helfand, Murray, astro-ph/0204151, to appear in the ApJ)
Nasa press release of 10 April 2002:"Cosmic x-rays reveal evidence for new form of matter"
www.msfc.nasa.gov/news