Astronomy C Question Marathon
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Re: Astronomy C Question Marathon
The orbit of an eclipsing binary system is oriented such that it is observed from directly edge-on. The system has a period of 68 hours, the secondary star has an orbital velocity of 72.5 km/s, and the eclipse of the primary star lasts 11 hours. What is the diameter of the primary star?
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Re: Astronomy C Question Marathon
cellobix wrote:The orbit of an eclipsing binary system is oriented such that it is observed from directly edge-on. The system has a period of 68 hours, the secondary star has an orbital velocity of 72.5 km/s, and the eclipse of the primary star lasts 11 hours. What is the diameter of the primary star?
72.5 km/s * 11 hr * 3600 s/hr = 2.87 x 10^6 km?
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Re: Astronomy C Question Marathon
When you say "the eclipse of the primary," are we talking primary minimum, or when the secondary star eclipses the primary star?cellobix wrote:Nope.
Also, on an eclipsing binary light curve, is this 11 hours = T3 - T1? Or T4 - T1?
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Re: Astronomy C Question Marathon
I am referring to the secondary star eclipsing the primary.Crazy Puny Man wrote: When you say "the eclipse of the primary," are we talking primary minimum, or when the secondary star eclipses the primary star?
I'm not sure what you mean by T1, T3, and T4, sorry.Crazy Puny Man wrote: Also, on an eclipsing binary light curve, is this 11 hours = T3 - T1? Or T4 - T1?
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Re: Astronomy C Question Marathon
He means like in: http://www.wallentinsen.com/binary/1-1_lightcurve.gif.cellobix wrote:I am referring to the secondary star eclipsing the primary.Crazy Puny Man wrote: When you say "the eclipse of the primary," are we talking primary minimum, or when the secondary star eclipses the primary star?I'm not sure what you mean by T1, T3, and T4, sorry.Crazy Puny Man wrote: Also, on an eclipsing binary light curve, is this 11 hours = T3 - T1? Or T4 - T1?
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