אודות פרק זה
Transcript: Consider a binary system where a giant or a supergiant star is in orbit around a white dwarf and where a mass transfer between the lobes pushes the white dwarf over the Chandrasekhar limit. At this point the white dwarf collapses catastrophically to form either a neutron star or a black hole blasting off a lot of material in a titanic explosion called a supernova. This particular type of supernova that occurs in binary systems is a Type II supernova, and because of the regulated way in which the mass is added to the white dwarf, the luminosity, which at its peak can exceed the luminosity of the entire Milky Way, is a well regulated number, a standard candle as astronomers would say. The incidence rate of supernovae is a thousand times less than the incidence rate of novae.
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חיפוש פרקים ישנים
חפש פרקים קודמים של 17. Galactic Mass Distribution and Galaxy Structure.
פרקים אחרים בפודקאסט הזה
Transcript: It’s a great challenge to determine the true incidence of binary and multiple star systems. The nearest stars are well observed, but it’s a very small sample. As we go to more distant stars a faint companion might not be detectable. Spectroscopic binaries are biased towards small se…
Transcript: How does mass transfer occur in a close binary pair? The Roche surface or lobes define the region of space where gas is bound to one or both stars. If either star becomes a giant the outer layers swell to fill the lobe, and the teardrop shape becomes the actual surface of the star. …
Transcript: Consider a binary pair where the more massive star has expanded to fill its Roche lobe, and the smaller star is a white dwarf of nearly 1.4 solar masses. As the massive star dumps hydrogen onto the white dwarf the gas is compressed, rapidly heated, and it ignites nuclear reactions tha…
Transcript: Most binary stars orbit slowly with a large distance between the two stars. However, a small fraction of binary systems are in close, tight, rapid orbits. In this situation mass transfer can occur from one star to the other. The system of two co-orbiting stars is surrounded by two t…
הצהרה: הפודקאסט והגרפיקה המוטבעים בדף זה הם מ-Dr. Christopher D. Impey, Professor, Astronomy, שהוא רכושו של בעליו ואינו קשור או מאושר על ידי Listen Notes, Inc.
