SU Lyn Call for observations by Katarzyna Drozd

Information about outbursts of eruptive stars, Be activity, ...
Francois Teyssier
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SU Lyn Call for observations by Katarzyna Drozd

Post by Francois Teyssier »

H alpha evolution
sulyn_ 20160504_868_fteyssier.png
sulyn_ 20160504_868_fteyssier.png (29.61 KiB) Viewed 10380 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
Francisco Campos
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post 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
_sulyn_20170320_884_FPC.png (12.58 KiB) Viewed 10355 times
Salut!
Fran
Olivier GARDE
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post by Olivier GARDE »

I'm now on this target with eShel spectrograph....
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Francois Teyssier
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post by Francois Teyssier »

Excellent!
Waiting for the fits

François
Olivier GARDE
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post by Olivier GARDE »

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

The full spectrum (23 orders merged)
Image

Order 34 (H Alpha line)
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Joan Guarro Flo
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post by Joan Guarro Flo »

Hi,
Is the SU Lyn, inthe night 2017 03 29.
J. Guarro.
Attachments
_sulyn_20170329_789_J. Guarro.png
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Francisco Campos
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post 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
Olivier GARDE
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post 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)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
umberto sollecchia
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post by umberto sollecchia »

Bonjour, voici ma contribution.
Umberto
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Profilo SU Lyn.jpg
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Francois Teyssier
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Re: SU Lyn Call for observations by Katarzyna Drozd

Post 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
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