We are excited to announce the launch of our new forums! You can access it forums.aavso.org. For questions, please see our blog post. The forums at aavso.org/forum have become read-only.
Announcement: New Applications
We are excited to announce the launch of our new applications! We're opening up early access to our new applications for searching, downloading, and submitting photometric observations. You can now access these applications through these links:
We ask for your feedback in order to help us improve these applications. Please send feedback for the applications above to feedback@aavso.org. Note: please avoid duplicating submissions across the two submit applications.
The answer to your question is a matter of perspective. First off, all stars (including our Sun) are variable to some small extent. However, this variability may not be detectable using typical amateur equipment. The short answer is no, all binary stars are not variable stars from our vantage point on Earth. Only when the orbital inclination of a binary system is favorably positioned, then a fraction of each may be visually obscured on a periodic basis resulting in a decrease in the overall brightness of the system.. This can be used to define the orbital period which can be as short as a few hours or in some cases as long as months or years. As far as I know, only stars that exhibit some sort of variability are maintained in their archives. This includes host stars for exoplanet systems which may only vary by fractional percentage (<<1%) changes in overall brightness.
I have been running some .FITS files in NASA's Exoplanet Transit Interpretation Code (EXOTIC) which links to the AAVSO database to obtain star charts and getting error messages when inputting certain host stars (mostly binaries with exoplanets in Circumbinary orbits e.g Kepler 1647, 35, 453 etc, hence my question.
Scott who works with the MAST database pointed me to the TESS Eclipsing Binary Survey https://tessebs.villanova.edu...it's quite resourceful.
The answer to your question is a matter of perspective. First off, all stars (including our Sun) are variable to some small extent. However, this variability may not be detectable using typical amateur equipment. The short answer is no, all binary stars are not variable stars from our vantage point on Earth. Only when the orbital inclination of a binary system is favorably positioned, then a fraction of each may be visually obscured on a periodic basis resulting in a decrease in the overall brightness of the system.. This can be used to define the orbital period which can be as short as a few hours or in some cases as long as months or years. As far as I know, only stars that exhibit some sort of variability are maintained in their archives. This includes host stars for exoplanet systems which may only vary by fractional percentage (<<1%) changes in overall brightness.
Kevin
Hi Kevin,
I guess variability is a matter timing then?
I have been running some .FITS files in NASA's Exoplanet Transit Interpretation Code (EXOTIC) which links to the AAVSO database to obtain star charts and getting error messages when inputting certain host stars (mostly binaries with exoplanets in Circumbinary orbits e.g Kepler 1647, 35, 453 etc, hence my question.
Scott who works with the MAST database pointed me to the TESS Eclipsing Binary Survey https://tessebs.villanova.edu...it's quite resourceful.
Thanks for your reply.
AAVSO has an eclipsing binary section:
https://www.aavso.org/aavso-eclipsing-binaries-section
Ray
Thanks Ray.