STF450 companion variable?
Posted 21 January 2014 - 05:27 PM
Posted 21 January 2014 - 06:41 PM
My images show the third star almost disappearing in the g' blue-green filter that is close to V, while it is much brighter in the red r' filter. The second star has the same behavior but less so.
I don't know how accurate the Struve values are or if he was skewed by red in the color - but yes the second star seems much fainter than 9.1 in the equivalent V band - and Eichorn's value is 9.65 for the second and 10.71 for the third. My values are even fainter relative to the primary - but they aren't calibrated and they use different filters.
Posted 22 January 2014 - 08:47 AM
Posted 22 January 2014 - 03:26 PM
I will probably do it again but will calibrate the magnitudes with comparison stars.
But there are other more recent published values for the photometric magnitudes of the stars, and they are fainter than the 9.1 value.