Astronomy 1021 Lecture Notes - Lecture 18: Melting, Radio Wave, Gravitational Wave
4 Oct 2018
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Document Summary
This eclipsing binary has two stars: 3. 2 m ms (b8) and 0. 7 m subgiant k2. Most massive star turns off main sequence first, and becomes a red giant. Less massive star pulls gas away from primary. Originally least-massive star gains material until it becomes the most massive. 0. 8 m subgiant star used to be more massive. Light from nova illuminated nebula which was not seen before. Ejected material can be seen as nova remnant. Accretion resumes; process repeated and we see "recurring novae" (10s-1000s years between bursts. At chandrasekhar limit, c fusion temperature is reached. Both produce lots of energy but have different . Type la sn always have same luminosities ( ex. same energy) Inverse square law accurately determines distance to sn"s galaxy. Paperclip would weigh as much as mount everest. If bean is aligned with earth, we see pulses. Any bigger and outermost layers would fly off. Fastest spin for a wd would produce 1 s pulse.
