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

Information about outbursts of eruptive stars, Be activity, ...
Benjamin Mauclaire
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Joined: Thu Sep 29, 2011 10:14 am

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

Post by Benjamin Mauclaire »

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
Spcaudace spectroscopy software: saving you hundred hours of frustration.
Peter Somogyi
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Joined: Sun Jul 13, 2014 8:56 am

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

Post by Peter Somogyi »

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
Benjamin Mauclaire
Posts: 258
Joined: Thu Sep 29, 2011 10:14 am

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

Post by Benjamin Mauclaire »

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
Spcaudace spectroscopy software: saving you hundred hours of frustration.
admin
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by admin »

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

Post by Christian Buil »

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

Image

Image

Christian B
Francois Teyssier
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by Francois Teyssier »

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 14020 times
V (green) and B-V (blue)
AGDra_BV1.PNG
AGDra_BV1.PNG (17.5 KiB) Viewed 14020 times
All the best,
François
etienne bertrand
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Re: Call for monitoring of AG Dra by R. Galis & al.

Post by etienne bertrand »

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

Post by Francois Teyssier »

Hello Etienne,
It looks very good
Waiting to the fit for inclusion in the base
Bonne continuation,
François
etienne bertrand
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Joined: Mon Aug 31, 2015 11:26 am

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

Post by etienne bertrand »

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

Post by Christian Buil »

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/

Christian B
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