AX Per in outburst

Information about outbursts of eruptive stars, Be activity, ...

AX Per in outburst

Postby Francois Teyssier » Tue Oct 17, 2017 2:57 pm

AXPer.png


A spectrum obtained by Fran Cmapos shows the classical symbiotic AX Per in outburst
Large spectroscopic changes incomparison to recent spectra obtaines by Davis Boyd, Tony Rodda, James Foster, notably disappearence of [Fe VII] lines
(Cooling of the expended envelope)

ARAS DataBase: http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/AXPer.htm

It is consistent with the rise of luminosity détected by David Boyd (V Band)

AXPer_V.PNG
AXPer_V.PNG (4.13 KiB) Viewed 1325 times


Further observations are strongly recommanded

François
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Re: AX Per in outburst

Postby Francois Teyssier » Tue Oct 17, 2017 8:56 pm

Comments from Ausgustin Skopal


yes, that's right, AX Per is entering an outburst, although its
light curve from around 2007 seems to reflect a continuous active
phase. It is interesting that the forbidden line [FeVII] 6087 disappeared
on the October spectrum. If it is created by collisions at/around the
orbital plane between the stars, than it can be that something blocks
the fast particles from the hot component here. If this is a disk-like
structure around the WD, then a blue shifted absorption in hydrogen lines
should be (gradually) seen. Its connection with the hot component
is proved by its presence also around the orbital phase 0.5.
A significant broadening of the emission core/wings of, e.g., H-alpha
is observed during outbursts. Emissions of HeII and [OIII] are of
specific importance for understanding active phases of AX Per, etc.
Good luck, and all the best,

Augustin
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Re: AX Per in outburst

Postby Francisco Campos » Tue Oct 17, 2017 9:09 pm

Ooops!, What a surprise... I didn't noticed it. Apart from the dissapearance of the [FeVII] lines, I see a new broad band at 4637 A, maybe a triplet. Maybe NIII?

What I don't understand is why, in an outburst, the common enveloppe becomes colder. In this situation, I believed that the dissapearance of forbidden transitions is due to a increase of the density of the common enveloppe gas, so the evolution seems the opposite to the evolution of a nova towards the nebular phase... Well, I don't know... Surely I'm wrong :oops:

Kind regards!
Fran
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Re: AX Per in outburst

Postby David Boyd » Wed Oct 18, 2017 8:28 am

These spectra show the change between Aug 31 and Oct 15 corresponding to a V magnitude increase from 11.33 to 10.87. The emission line flux of the hydrogen Balmer and He I lines has doubled. However both the He II and H-beta line fluxes have increased in the same proportion so the hot star temperature as estimated from the He II/H-beta ratio is almost unchanged. Also note that the [FeVII] emission line has disappeared (lower left plot).

David

AX Per 2017-08-31.920 + 2017-10-15.789.jpg
AX Per 2017-08-31.920 + 2017-10-15.789.jpg (190.69 KiB) Viewed 1285 times
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Re: AX Per in outburst

Postby Christian Buil » Sun Oct 22, 2017 1:00 am

A spectrum of AX Per taken the 20.9/10/2017 (RC 254 mm + eShel(2) + ASI1600MM):

Image

Image

Image

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Re: AX Per in outburst

Postby Olivier GARDE » Sun Oct 22, 2017 6:46 am

Amazing spectrum Christian, the eShel(2) upgrade give a better response in the blue and go deep in the blue...
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: AX Per in outburst

Postby umberto sollecchia » Tue Oct 24, 2017 8:45 pm

Bonsoir, le spectre d'AX FOR observé le 23-10-2017.Salut -Umberto

axper_20171023_820_Umberto Sollecchia.png
axper_20171023_820_Umberto Sollecchia.png (18.45 KiB) Viewed 1110 times
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Re: AX Per in outburst

Postby Forrest Sims » Fri Oct 27, 2017 11:38 pm

Here is my plot of AX Per from 2017-10-27.171.
I have also included the subplot centered on HeII at 4,885.68 for my last 5 observations.

cheers!
Woody
Attachments
axper_20171027_171_Woody Sims annotated.png
axper_20171027_171_Woody Sims annotated.png (31.06 KiB) Viewed 1082 times
axper 5 nights subplot HeII.png
axper 5 nights subplot HeII.png (28.23 KiB) Viewed 1082 times
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Re: AX Per in outburst

Postby Christian Buil » Thu Nov 09, 2017 12:26 am

Details of AX Per spectrum taken the 7.8/11/2017 (RC 10 inch, modified eShel (135MM Samyang), ASI1600MM camera):

Image

Image

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Re: AX Per in outburst

Postby Christian Buil » Sat Dec 02, 2017 10:57 am

Prise de vue en deux parties de AX Per le 25/11/2017 avec le eShel modifié (l'objectif est à présent un Canon 135 mm f/2 L), une focalisation pour le visible, une autre pour l'UV, puis un aboutage des deux :

Image

Image

Image

Image

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