Suspected/Misclassified Symbiotics: spectra required

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Peter Velez
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Peter Velez »

I've updated the annotated plot to remove the additional spectrum - it was a bit busy

Pete
Jaroslav Merc
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Jaroslav Merc »

Hi Pete,

thank you for your checking the guider image of V618 Sgr. That would mean, that the spectral appearance of V618 Sgr changes significantly with time, depending on the brightness (comparing Terry's, yours, and Kilkenny's 1988 spectrum). That is very interesting! I definitely suggest obtaining other spectra of this object in the next season.

The spectrum observed in October 1988 by Kilkenny shows some TiO bands, similar to one obtained by Terry, however, also Balmer lines in emission. These are usually not detected in R CrB stars as they are hydrogen deficient. That was the reason which led Kilkenny to suggest the symbiotic nature of this target. My working hypothesis is, that if the star is indeed a symbiotic star, the dips observed in the recent light curve might be eclipses.

Jaroslav
Jaroslav Merc
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Jaroslav Merc »

Let me also inform you, that the paper on Hen 3-860, the new southern eclipsing symbiotic star has been accepted in the Monthly Notices of the Royal Astronomical Society and is available on arXiv since today: https://arxiv.org/abs/2111.14975. The spectra obtained by Pete and Terry have been used in this work.
Francois Teyssier
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Francois Teyssier »

Congratulations Jaroslav+, Terry and Peter!
I'm very happy to see that this collaboration is so fruitfull.

All the best,
François
Hubert Boussier
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Hubert Boussier »

Bonsoir,

Dans la nuit du 30/11 au 1/12 en attendant que la comète C/2021 A1 Leonard soit levée, j'ai profité de la présence bien placée d'une candidate de la liste des étoiles symbiotiques suspectées pour faire le spectre de TYC-1371-69-1.

Ci- joint le spectre. J'ai rajouté sur le profil les marqueurs des raies que l'on recherche sur les candidates étoiles symbiotiques.

Image


Je ne vois aucune des raies en émission.

PS : si vous êtes curieux de voir le profil du spectre de la comète imagée juste après, c'est la porte à côté 8-) i :

http://www.spectro-aras.com/forum/viewt ... =41&t=2856

Bonnes observations

Hubert
Last edited by Hubert Boussier on Fri Dec 03, 2021 9:21 pm, edited 1 time in total.
2SPOT
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by 2SPOT »

From our setup in Chile this morning, a spectrum of Gaia 20fut (mag. V=13,1)

Image

And the target close to the Alpy slit

Image
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Hubert Boussier
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Hubert Boussier »

Bonjour,

J'ai dû manquer le changement d'adresse pour l'envoi des fichiers des profils de spectre .Fit.

Mon dernier envoi à francoismathieu.teyssier at bbox.fr qui est l'adresse indiquée sur le premier message du sujet

Le système m'a retourné le message d'erreur suivant : This is the mail system at host mx-dy.bbox.fr.

Le message suivant n'a pu etre envoye a un ou plusieurs des destinataires pour la raison indiquee ci-dessous.
-- Postmaster

PS : je précise que dans l'adresse mail j'ai bien un @ sans blanc avant et après :)

Hubert
Jaroslav Merc
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Jaroslav Merc »

Hubert, thank you for obtaining the spectrum of the target. Would you be so kind to confirm, that you observed TYC-1371-69-1 and not TYC-1371-69-6 mentioned in your post? I am just checking to be sure, I was not able to find any star with the designation TYC-1371-69-6 in the SIMBAD, so I think this is only mistyping of the name. But to be sure. Although the object is not showing emission lines, the spectrum is slightly different from the one presented in the literature. I will look at the spectrum in detail after it will be included in the database. Let me add, that this is a candidate for symbiotic nova and at least during the outbursts, these do not show a typical symbiotic spectrum.

Thank you also for the spectrum of Gaia20fut. The spectrum is non-symbiotic. It means it is another contaminant among the targets selected from Gaia Alerts. This is not unexpected and it is an important result in order to be able to put more strict criteria for the selection of the fainter targets which will be crucial than for obtaining the observation time on the bigger telescopes.
Hubert Boussier
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by Hubert Boussier »

Jaroslav, I am just coming back from the observatory in order to check the log of "Carte du ciel" which is the soft I used to point TYC 1371-69-1. I confirm that the star I pointed was TYC 1371-69-1 and not TYC.1371-69-6
As you said for simbad, "Carte du Ciel" also did not found TYC-1371-69-6, so this is a mistyping.

So If I well understand, we will have to take time to time spectrums of this starto confirm that it is not a symbiotic one. What about the frequency ?

Concerning the .fit file, as I said just before (sorry it was in, French) I did not succeeded in sending the file to François, it seems that the mail I used (francoismathieu.teyssier at bbox.fr with an @) was not able to receive the mail.


Any way, if necessary the file can be download here :

http://www.astrosurf.com/astrild/Autres ... 14_HBO.fit


Hubert
2SPOT
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Re: Suspected/Misclassified Symbiotics: spectra required

Post by 2SPOT »

Hubert,

To clearly identify that you didn't get the wrong target, you have to take an image of the autoguiding sensor with the target close to the slit like what we did here on gaia 20fut
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