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andrew s

Testing my flare strategy

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I have started looking to get low resolution spectra of Red Dwarf stars during a flare.  However, they are not frequent and I wanted to test my strategy of finding a flare by doing photometry on the zero order image. To this end I decided to look at CW Cas an eclipsing binary and follow the exact procedure of aligning the frames then doing multi-star photometry with out any calibration in astroimagej. The result is attached. There were light clouds at times hence the increase in noise in places but I was pleased with the result. (The gap is a meridian flip.) All was done automatically using CCDAutoPilot5 and The Sky X while I attended the Chester Astro Soc meeting and then slept.

2082877401_CWCas.png.f78ec3b82ac123e93327843b12984b99.png

Regards Andrew

Edited by andrew s
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Great result Andrew. Will be very useful doing spectroscopy and photometry at the same time.

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3 minutes ago, JeremyS said:

Great result Andrew. Will be very useful doing spectroscopy and photometry at the same time.

Unfortunately,  the zero order is not on any standard photometric system as it is the residual left after the spectra have been diffracted out. Nevertheless,  it can save me looking at thousands of images one by one!

Regards Andrew 

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Interesting test target.  For fun I dug out some B,V light curves from this paper

https://academic.oup.com/pasj/article/62/2/457/1461174

and plotted a rough B-V  curve. There is a bit of scatter, probably because the B ,V measurement times were not coincident, but there is about a 6-7% colour change. Not the primary purpose of course but I wondered if that is large enough to pick up in your spectra ?

 

Cheers

Robin

 

CW_Cas_B-V.png

Edited by robin_astro
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@robin_astro interesting idea. I will have  look.  Not sure how good the spectra are as I did not seek to avoid other stars/spectra in this trial. Could always do it again though.

Regards Andrew 

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Hi @robin_astro, unfortunately the spectra was contaminated with that of another star. I will have to do it again with a different position angle.

Regards Andrew 

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