Call for monitoring of AG Dra by R. Galis & al.

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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Benjamin Mauclaire » Tue May 15, 2018 9:23 pm

Hi Peter,

As often in astro papers, mathematical developpement are in the Appendix.
See p10 for sigma(EW) formula.

More recently in 2006, Vollmann and Eversberg wrote a short paper with some improvements that makes continuum S/N less important and then, sigma(EW) a bit less overestimated:
https://arxiv.org/abs/astro-ph/0606341

Benji
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Peter Somogyi » Wed May 16, 2018 7:22 pm

Hello Benji,

Thank you for bringing these articles to my attention, now I can understand the essence is about using the continuum of a single spectrum by comparing it to an average-continuum of several spectra (or a theoretically expected one).
My approach was a kind of similar here in the sense of using the nearby continuum - but estimated only a global average.
I will find a way to acquire this method soon!

Cheers,
Peter
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Benjamin Mauclaire » Thu May 17, 2018 9:30 am

About correlation compuation, as in GPL such functions are available in Audela too:
----
::math::statistics::corr {1 2 3 4 5} {2 6 8 9 4}
# 0.386510341262
::math::statistics::corr {1 2 3 4 5} {2 4 6 8 10}
# 1.0
----

I've prefered to focus my attention on Audela as it can do both processing and telescop mount + camera managing.
Whole tasks can be scripted (tcl language) and it's of course open source software. This latter makes it easy to add new code in it.

Benji
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby admin » Thu May 17, 2018 10:12 am

Please, continue this interesting discussion in appropriate forum (software)
This topic is dedicated to observations of AG Dra and its current outburst
Regards,
ARAS Admin
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Christian Buil » Sun May 20, 2018 2:15 pm

AG Dra the 19.85 / 05 / 2018 and evolution from 1.83 / 05 / 2018 :

Image

Image

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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Francois Teyssier » Mon May 21, 2018 5:34 pm

Current status

The target is fading, but perhaps a plateau since 3 days.
So, we continue the observations at the same frequency. One spectrum a day.

AGDRa_V4.PNG
AGDRa_V4.PNG (6.98 KiB) Viewed 1293 times


V (green) and B-V (blue)
AGDra_BV1.PNG
AGDra_BV1.PNG (17.5 KiB) Viewed 1293 times


All the best,
François
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby etienne bertrand » Thu May 24, 2018 9:33 am

my contribution at AG Dra this night :
Image
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Francois Teyssier » Thu May 24, 2018 4:59 pm

Hello Etienne,
It looks very good
Waiting to the fit for inclusion in the base
Bonne continuation,
François
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby etienne bertrand » Fri May 25, 2018 4:10 pm

Merci François, je vais essayer de la suivre un peu plus cette étoile.
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Re: Call for monitoring of AG Dra by R. Galis & al.

Postby Christian Buil » Sat Jun 09, 2018 10:27 pm

A 6.9/06/2018 observation by using a non-standard spectrograph, here a prism spectrograph optimized for the deep bleu en near UV spectral region (SNAKE spectrograph + RC10 telescope (F=0.254 m f/8) + ZWO 1SI183MM camera - 3 x600 + 300 s exposure from Castanet-Tolosan observatory) :

Image

Technical description of the spectrograph :

http://www.astrosurf.com/buil/snake/

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