ASTR 001 Lecture Notes - Lecture 15: Vela Supernova Remnant, White Dwarf, Oort Cloud
Document Summary
Pulsars are neutron stars that give off very regular pulses of radiation. Psr 0329+54 is among the strongest known pulsars and was one of the first discovered. It has a pulse period of about 0. 715 seconds. Psr 0833-45 resides in the vela supernova remnant. It spins much faster, with a period of 89. 3 milliseconds. Psr 1937+21 is the fastest known pulsar and was the first millisecond pulsar discovered. It spins on its axis every 1. 56 milliseconds, or over 640 times per second. ("faster than a kitchen blender!") The youngest known pulsar the crab pulses 30 times per second. Pulsars spin fast (cid:271)e(cid:272)ause (cid:272)ore"s spi(cid:374) speeds up as it (cid:272)ollapses i(cid:374)to (cid:374)eutro(cid:374) star. White d(cid:449)arf"s gra(cid:448)ity pulls (cid:373)atter off of gia(cid:374)t (cid:272)o(cid:373)pa(cid:374)io(cid:374), (cid:271)ut a(cid:374)gular (cid:373)o(cid:373)e(cid:374)tu(cid:373) prevents the matter from falling straight in. Infalling matter forms and accretion disk around the white dwarf. Friction in disk makes it hot, causing it to glow.
