V404 Cygni article published

I was lucky enough to be named as a co-author to an article about this target published in the scientific journal Nature, January 7, 2016.  Here's a link:

Nature article about V404 Cygni

There was also a article published by my variable star astronomy group, AAVSO at:

AAVSO article about observers helping with the science

Very cool...

V404 Cyg in outburst!

This target in the constellation of Cygnus, V404, is known to be a black hole binary paired with a near solar mass companion.  On June 15, 2015 it went into outburst rising from magnitude 19 to about magnitude 12.

I first observed the target on June 19 and the outburst was continuing.  Here is a light curve of it's activity.



This chart contains observations over about a four hour period.  The dark dots show the changes in brightness over the period, the red dots show a nearby comparison star which as you can see, is unchanging.  Each dark dot is a 30 second exposure, measured with photometric software.  Since each dot is 30 seconds, changes in brightness at the two or three minute level can be seen.  Very exiting.

Cool data...

Here is a cool light curve that jumped out at me.

The target is PNV J19150199+0719471  which is a newly discovered cataclysmic variable in Aquila.  This is about a 4 hr. run, each dot is a 60 second observation with a CCD camera and yes, those are error bars!  The precursor object was about 20th mag, here you can see it's varying around 15.8  The target is showing a 87 minute period.  This sawtooth pattern is referred to as 'superhumps'.  The model says this is oscillations in the accretion disk swirling around the white dwarf as the matter pours on to it.  It's pretty dramatic…