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

[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

[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]

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

[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]

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





Christian B

[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 (6.98 KiB) Viewed 10141 times

V (green) and B-V (blue)

AGDra_BV1.PNG (17.5 KiB) Viewed 10141 times

All the best,
François

[etienne bertrand]

my contribution at AG Dra this night :

[Francois Teyssier]

Hello Etienne,
It looks very good
Waiting to the fit for inclusion in the base
Bonne continuation,
François

[etienne bertrand]

Merci François, je vais essayer de la suivre un peu plus cette étoile.

[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) :



Technical description of the spectrograph :

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

Christian B