spectro-aras.com

H alpha evolution
Note that Katarzyna Drozd (Nicolaus Copernicus Astronomical Center, Warsaw, Poland) is very interested by this new discovered symbiotic
So, more data are required (low an high res)
Say, at least one spectrum a month (SU Lyn isn'st a very active symbiotic star, looks like EG And, ZZ CMi, with essentially variations due to orbital motion)
Photometry BVR should also be welcome

All the best

François

PS : don't forget the other main targets.
This is the continuous observations, at the highest cadency as possible, on the long term which are the keys of the insterest of the database

Hello,

Ok, I will try to take a low resolution (R=800) and a medium resolution (R=6000) spectrum every month. For the moment, here is one taken five days ago.
Salut!
Fran

I'm now on this target with eShel spectrograph....

Excellent!
Waiting for the fits

François

Here's a spectrum taken last night with eShel Spectrograph R=11000

The full spectrum (23 orders merged)


Order 34 (H Alpha line)

Hi,
Is the SU Lyn, inthe night 2017 03 29.
J. Guarro.

Amazing spectrum, Olivier. With that resolution and the echelle, I wonder if observations made with low resolution spectrographs have an interest...

Talking about photometry of this star, I think it is very important to choose an adequate comparison star. Unfortunately, the AAVSO sequence lacks of suitable stars for CCD near SU Lyn and, in fact, this star is very poorly covered with photometry. Does Katarzyna Drozd suggest any comparison star? If not, I could suggest one and a pair of check stars...

Greetings
Fran

Francisco Campos wrote:Amazing spectrum, Olivier. With that resolution and the echelle, I wonder if observations made with low resolution spectrographs have an interest...

Greetings
Fran

Hi Francisco,

Of course yes, low resolution spectrum is important for 3 reasons :
- You can do a spectrum with less exposure time than for an echelle spectrum (i have to use more than 3 hours to have a correct SNR...)
- You have a more accurate continuum with a low resolution spectrum because with echelle spectrum, to have the full spectrum, we have to merged all order.
- You can go deeper in the blue (with echelle, it's difficult to have a good SNR in the blue du to the magnitude of this star)

Bonjour, voici ma contribution.
Umberto

Hi Francisco,

I do agree with Olivier's answer
Spectra at R ~ 1000 are very interesting since they are well corrected for atmo/inst response.
Flux calibration is a must

But I think that the best answer is :

https://arxiv.org/abs/1607.06804
We are grateful to all of the amateur astronomers that
contributed their observations to this paper. In particular,
we are thankful to members of the ARAS group for their
wonderful work.
See Table A1

or

https://arxiv.org/abs/1606.07397
We also thank
Fran¸cois Teyssier for altering us to the many amateur spectroscopic
observations which have been made and we acknowledge
and thank Fran¸cois Teyssier, Umberto Sollecchia,
Joan Guarro Flo, Jacques Montier, Peter Somogyi,
Keith Graham and V Bouttard for use of their spectra

Two other papers are currently submitted for publication, using high *and* low res spectra from ARAS database

High quality spectra / long term and high freqency observation are the keys of the fame of the base amoung professionnals

All the best,

François