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SU Lyn Call for observations by Katarzyna Drozd
Posted: Tue Mar 28, 2017 4:25 pm
by Francois Teyssier
H alpha evolution
- sulyn_ 20160504_868_fteyssier.png (29.61 KiB) Viewed 10575 times
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
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Tue Mar 28, 2017 8:54 pm
by Francisco Campos
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.
- _sulyn_20170320_884_FPC.png (12.58 KiB) Viewed 10550 times
Salut!
Fran
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Tue Mar 28, 2017 9:18 pm
by Olivier GARDE
I'm now on this target with eShel spectrograph....
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Wed Mar 29, 2017 1:55 am
by Francois Teyssier
Excellent!
Waiting for the fits
François
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Wed Mar 29, 2017 10:03 am
by Olivier GARDE
Here's a spectrum taken last night with eShel Spectrograph R=11000
The full spectrum (23 orders merged)
Order 34 (H Alpha line)
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Thu Mar 30, 2017 9:02 pm
by Joan Guarro Flo
Hi,
Is the SU Lyn, inthe night 2017 03 29.
J. Guarro.
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Thu Mar 30, 2017 9:31 pm
by Francisco Campos
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
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Fri Mar 31, 2017 7:03 am
by Olivier GARDE
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)
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Fri Mar 31, 2017 10:17 am
by umberto sollecchia
Bonjour, voici ma contribution.
Umberto
Re: SU Lyn Call for observations by Katarzyna Drozd
Posted: Sun Apr 02, 2017 8:05 am
by Francois Teyssier
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