possible black hole binary/ternary system in ArasBeAm

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Hamish Barker
Posts: 226
Joined: Thu Jun 20, 2019 12:11 am

possible black hole binary/ternary system in ArasBeAm

Post by Hamish Barker »

https://www.aanda.org/articles/aa/full_ ... 20-20.html

here is a new paper on indications that there might be a rather close ( 1000 LY ) black hole in a binary/ternary system. HR6819 (HD167128).

I had a look in ArasBeAm, there are 7 spectra registered.
http://arasbeam.free.fr/spip.php?page=b ... etoile=970

I will forward the link to ArasBeAm to the PI, perhaps it may be of use. The target is mag 5.33 so within reach of southern amateurs (RA 18 17 07 dec -56 01 24 ). And add it to my list of observations to make when I get everything working (have just bought a proper mono camera to go onto my L200 littrow).
Terry Bohlsen
Posts: 191
Joined: Thu Sep 29, 2011 7:40 am

Re: possible black hole binary/ternary system in ArasBeAm

Post by Terry Bohlsen »

Hi Hamish
This could be an interesting star to follow. I have taken spectra of it before at Ha, but Ha is not much good to measure the RV fo this star . He I 6678 is easy to image and seems to give good measurements.
This is another link to the paper.

https://www.eso.org/public/archives/rel ... o2007a.pdf
Terry Bohlsen
Armidale NSW
Australia
Tom Love
Posts: 64
Joined: Sun Apr 21, 2019 5:57 am

Re: possible black hole binary/ternary system in ArasBeAm

Post by Tom Love »

I have been working with Ed Budding on a system with some similarities to this, V Puppis. Accurately measuring RV from the massively broadened lines is quite ticklish - if you can get to about 5 km/s precision you're doing well. Terry's suggestion of the 6678 line is the one we were using for our measurements.
-------------------------------------------------
Martinborough, New Zealand. Alpy, Lhires RC12
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
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Re: possible black hole binary/ternary system in ArasBeAm

Post by Robin Leadbeater »

It looks like based on 3 further papers that HR6819 is probably not a tertiary system with a black hole after all but a binary system with the emission an accretion disk from a companion rather than a classical Be star
https://arxiv.org/abs/2007.05797
https://arxiv.org/abs/2006.11974
https://arxiv.org/abs/2006.10770

(Terry Bohlsen and Paul Luckas get an acknowledgement for their spectra in BeSS in the last one)

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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