אודות פרק זה
Transcript: An eclipsing binary is a pair of stars generally unresolved whose orbit is seen nearly edgewise. The stars alternatively eclipse each other which requires a very favorable orientation so only a small fraction of all possible systems are seen this way. The timing of the eclipse gives the period of the orbit, and the depth of the eclipses gives information both on the size of stars and the opacity of their atmospheres. For example, if a binary pair are in a circular orbit of a hundred kilometers per second and the timing occurs such that one star passes in front of the other for ten thousand seconds, roughly three hours, then the diameter of the star must be speed times time, a million kilometers. Eclipsing binaries are therefore essential in providing basic information on stellar sizes and in confirming theories of stellar structure.
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חיפוש פרקים ישנים
חפש פרקים קודמים של 17. Galactic Mass Distribution and Galaxy Structure.
פרקים אחרים בפודקאסט הזה
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 bla…
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: 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: 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…
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. …
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.
