Call for monitoring of AG Dra by R. Galis & al.
-
- Posts: 258
- Joined: Thu Sep 29, 2011 10:14 am
Re: Call for monitoring of AG Dra by R. Galis & al.
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
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.
-
- Posts: 420
- Joined: Sun Jul 13, 2014 8:56 am
Re: Call for monitoring of AG Dra by R. Galis & al.
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
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
-
- Posts: 258
- Joined: Thu Sep 29, 2011 10:14 am
Re: Call for monitoring of AG Dra by R. Galis & al.
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
----
::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.
Re: Call for monitoring of AG Dra by R. Galis & al.
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
This topic is dedicated to observations of AG Dra and its current outburst
Regards,
ARAS Admin
-
- Posts: 1431
- Joined: Mon Sep 26, 2011 6:59 pm
- Contact:
Re: Call for monitoring of AG Dra by R. Galis & al.
AG Dra the 19.85 / 05 / 2018 and evolution from 1.83 / 05 / 2018 :
![Image](http://www.astrosurf.com/buil/forum14/_addra_10180520_1.png)
![Image](http://www.astrosurf.com/buil/forum14/_addra_10180520_2.png)
Christian B
![Image](http://www.astrosurf.com/buil/forum14/_addra_10180520_1.png)
![Image](http://www.astrosurf.com/buil/forum14/_addra_10180520_2.png)
Christian B
-
- Posts: 1520
- Joined: Fri Sep 23, 2011 1:01 pm
- Location: Rouen
- Contact:
Re: Call for monitoring of AG Dra by R. Galis & al.
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.
V (green) and B-V (blue) All the best,
François
The target is fading, but perhaps a plateau since 3 days.
So, we continue the observations at the same frequency. One spectrum a day.
V (green) and B-V (blue) All the best,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
-
- Posts: 1040
- Joined: Mon Aug 31, 2015 11:26 am
Re: Call for monitoring of AG Dra by R. Galis & al.
my contribution at AG Dra this night :
![Image](https://storage.canalblog.com/58/06/799945/120198523_o.png)
![Image](https://storage.canalblog.com/58/06/799945/120198523_o.png)
-
- Posts: 1520
- Joined: Fri Sep 23, 2011 1:01 pm
- Location: Rouen
- Contact:
Re: Call for monitoring of AG Dra by R. Galis & al.
Hello Etienne,
It looks very good
Waiting to the fit for inclusion in the base
Bonne continuation,
François
It looks very good
Waiting to the fit for inclusion in the base
Bonne continuation,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
-
- Posts: 1040
- Joined: Mon Aug 31, 2015 11:26 am
Re: Call for monitoring of AG Dra by R. Galis & al.
Merci François, je vais essayer de la suivre un peu plus cette étoile.
-
- Posts: 1431
- Joined: Mon Sep 26, 2011 6:59 pm
- Contact:
Re: Call for monitoring of AG Dra by R. Galis & al.
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](http://www.astrosurf.com/buil/forum14/_agdra_plot2.png)
Technical description of the spectrograph :
http://www.astrosurf.com/buil/snake/
Christian B
![Image](http://www.astrosurf.com/buil/forum14/_agdra_plot2.png)
Technical description of the spectrograph :
http://www.astrosurf.com/buil/snake/
Christian B