Strong Balmer line emission in UV Aur

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David Boyd
Posts: 161
Joined: Wed Dec 11, 2013 5:50 pm

Strong Balmer line emission in UV Aur

Post by David Boyd »

Last night, 5th November, I recorded this spectrum of UV Aur which shows strong Balmer line emission, particularly H-alpha. In previous spectra of UV Aur I have found H-beta and H-gamma in absorption.

David
_uvaur_20171105_870_D.Boyd_flux_small.png
_uvaur_20171105_870_D.Boyd_flux_small.png (50.67 KiB) Viewed 4059 times
James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

Re: Strong Balmer line emission in UV Aur

Post by James Foster »

Nice work! I need to get my LISA back in action.....LhiresIII work is addicting, but I miss the many targets I can
shoot with LISA a night compared to 2-4 max I can shoot with LhiresIII per night.

UV Aur, according to AASVO, has a period of 394.42 days and is a "M+Z And" type variable.
Here it is in the ARAS spectral database:
http://www.astrosurf.com/aras/Aras_Data ... /UVAur.htm

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
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Re: Strong Balmer line emission in UV Aur

Post by Francois Teyssier »

James : GCVS, SIMBAD ... are poor references for symbiotics
Prefer the last catalog Belczinski & al., 2000 as reference : https://aas.aanda.org/articles/aas/pdf/ ... /h2255.pdf

The red giant in the symbiotic UV Aur is a Carbon Mira (C6,2 e)
Balmer emissions can be detected
See :http://www.astronomie-amateur.fr/AtlasS ... _Lisa.html

Note that the Balmer decrement is normal, unlike classical M Giants

I think (but not sure) that the emission is linked to the pulsation phase and appears around maximum luminosity (common behavior of Balmer lines in Miras)
AAVSO (Visual) and ARAS Spectra (blue dots)
UVAUR_PHOT.PNG
UVAUR_PHOT.PNG (6.51 KiB) Viewed 3983 times
Spectra from ARAS Database obtained near peak luminosity show Balmer lmine in emission
uvaur_.png
More detailed study should be welcome (for instance with EW measurements)

François
Tony Rodda
Posts: 25
Joined: Tue Mar 07, 2017 5:35 pm

Re: Strong Balmer line emission in UV Aur

Post by Tony Rodda »

Hi Guys,
UV Aur 16/Nov/17...
Regards
T
UV Aur
UV Aur
UV Aur 20171116.jpg (60.43 KiB) Viewed 3937 times
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