Sort enke pulsar
Kunstnerisk illustration af den eklipsende binære millisekundpulsar PSR B1957+20. Millisekundpulsarens stråling fordamper ledsagerens overflade.
En sort enke pulsar er indenfor astronomien en millisekundpulsar med en lavmasse ledsager i en omløbsbane.
Pulsaren kaldes en sort enke pulsar fordi elektromagnetiske stråling og partikelstråling opvarmer ledsagerens overflade og føre i løbet af nogle millioner år til en fuldstænding fordampning af ledsageren.
Der er opdaget følgende sort enke pulsarer:
- PSR B1957+20
- PSR J1653-0158[1]
Referencer
- ^ October 22, 2020, scitechdaily.com: Galactic “Mystery Source” of Gamma Rays Identified: Record-Setting “Black Widow” Pulsar Citat: "...After more than two decades, an international research team led by the Max Planck Institute for Gravitational Physics (Albert Einstein Institute; AEI) in Hannover has identified a Galactic “mystery source” of gamma rays: a heavy neutron star with a very low mass companion orbiting it...This ‘odd couple’ orbits every 75 minutes, more quickly than all known comparable binaries...”The neutron star also spins around its own axis at more than 30,000 rpm, making it one of the fastest rotating. At the same time, its magnetic field – usually extremely strong in neutron stars – is exceptionally weak...“In binary systems like the one we have now discovered, pulsars are known as ‘black widows’ because, like spiders of the same name, they eat their partners, so to speak,” explains Clark..."
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B1957 ill2.jpg
An artist's impression of the optical and X-ray emission surrounding the "Black Widow" pulsar B1957+20
An artist's impression of the optical and X-ray emission surrounding the "Black Widow" pulsar B1957+20