Suspected Symbiotic Stars: campaign for Adrian Lucy

Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Fri Sep 14, 2018 9:51 pm

A list of suspected symbiotic stars is published in AAVSO notice :https://www.aavso.org/aavso-alert-notice-650
A campaign on the request of Adrian Lucy and Jeniffer Solkolovski (Columbia University)
Faint targets, a nice goal for Alpy, LISA and other low resolution spectrograph.
What is expected is : late type continuum (giant M) and high ionisati on lines such as He II, [OIII], [Fe VII], Raman OVI ...
At least one of them is needed for identification of the target as a symbiotic star (See Belczinski & al., 2000)
The spectra will be added to ARAS database : http://www.astrosurf.com/aras/Aras_Data ... eStars.htm
Send spectra to lucy@astro.columbia.edu and francoismathieu.teyssier at bbox.fr
Good hunt!

François Teyssier
Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Tue Sep 18, 2018 4:36 pm

Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Forrest Sims » Tue Sep 18, 2018 8:30 pm

Greetings,

I saw François's request for spectrum on these potential Symbiotics.

I chose EN Sgr last night to see if I could get a spectrum. As you might have noticed all of these targets have a big fat (-) minus sign in front of the DEC. Makes me think they are made to order for Paul Lukas:) Add in the position of the Moon, the magnitudes and that many of these targets are setting in the west early in the evening reduces the candidates I can reach here from southern Arizona. I took 8 600sec images of EN Sgr with my LISA using HD214994 as a Reference star.

Here is a plate solved guider image of the field and the results displayed in PlotSpectra. Some preliminary analysis by François and Adrian Lucy point in the direction of this possibly being a Carbon Mira type star.

Cheers!
Woody
Attachments
ensgr_20180918_124_Forrest Sims annotated.png
EN Sgr guider plate solved annotated.jpg
EN Sgr guider plate solved annotated.jpg (22.55 KiB) Viewed 994 times
Forrest Sims
 
Posts: 39
Joined: Thu Feb 09, 2017 5:52 pm

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Fri Sep 21, 2018 3:08 pm

Makes me think they are made to order for Paul Lukas:)

Or for Terry who added two spectra in the base: http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/Suspected.htm
Another spectrum of EN Sgr confirms Woody's observations: Balmer lines in emission, but no sign of high ionization lines (He II, [OIII], [Fe VII], [Fe X], [Ca V], Raman OVI)
The Balmer decrement is normal. The continuum evoques a C star, but flat.
A difficulty is that for some symbiotics, high ionisation lines appears only in UV. See for instance our spectra of NQ Gme, UV Aur, BD Cam ... Or are sporadic (remember that CH Cyg was a M giant standart until the early 60' when appeared for the fist time its symbiotic characteristics ([OIII])
and a spectrum of Gaia DR2 6345873798283774848 (no emission on the red continuum)
One interesting aspect of this campaign is that we have also to determine the spectral class of the targets
"what is that spectrum?" An excellent school

François
Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Terry Bohlsen » Tue Sep 25, 2018 10:40 am

I've taken a spectrum of another candidate on the list. This one in Sgr.
GAIA DR 24048168377818693632. No emission lines are visible but lots of close absorption lines.
Cheers
Terry
gaiadr24048168377818693632_20180923_449_TBohlsen.png
Terry Bohlsen
Armidale NSW
Australia
Terry Bohlsen
 
Posts: 131
Joined: Thu Sep 29, 2011 7:40 am

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Fri Sep 28, 2018 6:52 pm

An excellent beginning, Woody and Terry

The summary of the campaign - current status: http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/SuspectedLog.htm

In blue: targets observable from northern hemisphere (low but possible)

All the best,

François
Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Sun Sep 30, 2018 3:06 pm

ASASSN-V J192916.53-2240403 obtained by Woody Sims with LISA

M3.5 continuum, H alpha and H beta (normal decrement)
A promising candidate

asassn-vj192916.53-2240403_20180921_153_Forrest Sims.png
asassn-vj192916.53-2240403_20180921_153_Forrest Sims.png (41.7 KiB) Viewed 802 times


Blue and Black: MIII3 and M4III Pickles

Updated log:

suspected.PNG
suspected.PNG (66.02 KiB) Viewed 802 times


François
Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francisco Campos » Sun Oct 07, 2018 10:38 am

Hi,

after a long absence, I tried to take some spectra of these suspected symbiotic star. They are very faint and bad placed to my observatory and, after trying with two different stars and avoiding guidage problems with PHD2, only with GAIA DR2 4150446010182968192 I could obtain something decent. With the other star (GAIA DR2 4150099732733246112) the spectrum I could obtain was too faint, although there were no emission signals also).

This suspected doesn't show emission lines

_gaiadr24150446010182968192_20181004_783_FPC.png
_gaiadr24150446010182968192_20181004_783_FPC.png (10.43 KiB) Viewed 713 times


Grettings,
Fran
Francisco Campos
 
Posts: 80
Joined: Sun Nov 29, 2015 10:13 pm

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Francois Teyssier » Sun Oct 07, 2018 5:09 pm

Excellent result on a faint target, Fran!
The continuum evoques a M4 giant

Update of the journal:

suspected.PNG
suspected.PNG (64.1 KiB) Viewed 647 times



François
Francois Teyssier
 
Posts: 1179
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: Suspected Symbiotic Stars: campaign for Adrian Lucy

Postby Christophe Boussin » Tue Oct 30, 2018 11:44 am

Hello all,

During our mission to the Pic du Midi from 22 to 26 October 2018, our team (Christophe Boussin, Michel Verlinden, Jean-Paul Godard and Hubert Colpin) was able to obtain, thanks to the 60 cm telescope and an Alpy 600, a first spectrum of the suspected symbiotic star FASTT 1100 of magnitude 14 !!

The following spectrum was obtained on October 24, 2018 at 18 h 56 UT (JJ = 2458416.311) with a resolution of 585 and an acquisition time of 60 min (12 x 300 s).

_fastt1100_20181024_789_Christophe Boussin_4000_7800_T60.png
FASTT1100 on October 24th (T60 Pic du Midi / Alpy 600)
_fastt1100_20181024_789_Christophe Boussin_4000_7800_T60.png (142.42 KiB) Viewed 284 times

fastt1100_20181024_789_Christophe Boussin.png
FASTT1100 on October 24th (T60 Pic du Midi / Alpy 600)


The observation conditions were not optimal (full Moon, low height of the target above the horizon) but it's possible to recognize without ambiguity the hydrogen Halpha and Hbeta lines in emission while the Helium HeI lines at 5876 and 6678A remain very uncertain.
The other lines are mentioned for information only...

Clear skies,

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan) @ ARAS database
Christophe Boussin
 
Posts: 40
Joined: Sun Aug 21, 2016 6:04 pm


Return to Symbiotic Stars

Who is online

Users browsing this forum: No registered users and 0 guests

x