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# Tag Info

## Hot answers tagged eclipsing-star-systems

6 votes
Accepted

### Total apparent magnitude of eclipsing binary system

Without information about stellar radii, I think it's reasonable to assume $R_A \approx R_B$. Then your equation becomes $$m_p - m_s = -2.5 \log \frac{F_A}{F_B}$$ and you can compute $k$ and the ...
• 18.7k
5 votes

### The definition of eclipsing binary star systems

I assume that the diagram indicates what the observer sees (if they had a big enough telescope!). i.e. The viewpoint is nearly in the orbital plane but not quite. Why then are the eclipses asymmetric, ...
• 155k
5 votes
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### Which things can LIGO see that LISA can't, and vice-versa?

Gravitational wave detectors have a frequency range that they are sensitive to. In the case of LIGO it is about 10Hz to 1kHz. The lower limit is imposed by seismic noise, the upper limit by "shot ...
• 155k
5 votes
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### What is the v sin i parameter?

That said, a common velocity observed in binary systems (or also generally multiple systems and exoplanet systems) is the radial velocity of the component(s) around the barycenter. That's the velocity ...
• 19.9k
5 votes
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### Orbital speeds of Components of Binary System

Use the vis-viva equation for 2 bodies: $$v^2=G(M_1+M_2)\left(\frac{2}{r}-\frac{1}{a}\right)$$ where $v$ is the relative velocity, $G \approx 887.125 \frac{\text{AU}}{M_\odot}(\text{km}/\text{s})^2$ ...
• 16.3k
4 votes
Accepted

• 155k
1 vote

### Semimajor axes data from Kepler Eclipsing Binary Catalog

The reason the KEBC doesn't have semi-major axes is because it's based entirely on photometric data with no EB modeling done. Determining the SMA requires spectroscopic data and EB modeling. ...
• 133
1 vote

### What is the spectral reflectance of starlight in a close binary?

This is a long-standing (and complicated!) problem in modeling eclipsing binary light curves. Here’s a full review from 1985 (with later citations here), which suggests (from a very quick skim) that ...
• 4,894
1 vote

### What is the spectral reflectance of starlight in a close binary?

Complementing @KenG's answer, Here's an actual datapoint. The new paper in Nature Polarized reflected light from the Spica binary system (downloadable here) is notable in that the measurement of the ...
• 30.6k
1 vote

### What percent of planets are in the position that they could be viewed edge-on from Earth? (and thus able to undergo transits)

The answer comes from the number of stars examined by each method. Kepler in the first part of its mission examined 150,000 stars. After the extended mission it has examined 503,506 https://en....
• 1,036

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