Request for spectra - ASASSN-18abl (at2018jsc)

Request for spectra - ASASSN-18abl (at2018jsc)

Postby Robin Leadbeater » Thu Dec 13, 2018 5:44 pm

I have had a request for spectra of this star from Prof Subo Dong of the ASSASN team. This star was not thought to be variable but has brightened by suddenly by ~3 mag to ~ mag 12. I plan to try tonight but I have thin high cloud currently.

https://wis-tns.weizmann.ac.il/object/2018jsc

http://www.cbat.eps.harvard.edu/unconf/ ... 02290.html

An image here

http://meineko.sakura.ne.jp/ccd/TCP_J03 ... 802290.jpg

Robin
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Re: Request for spectra - ASASSN-18abl (at2018jsc)

Postby Robin Leadbeater » Thu Dec 13, 2018 8:40 pm

A Spectrum in poor conditions (thin cloud) shows a blue continuum with weak H Beta H gamma absorption lines and no detectable H alpha


Robin
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Re: Request for spectra - ASASSN-18abl (at2018jsc)

Postby David Boyd » Fri Dec 14, 2018 9:06 am

A similar result with my LISA. Conditions here were also poor with thin high cloud reducing flux. A subsequent email from Tonny Vanmunster to the CBA group reported observing superhumps and suggested this was an AM CVn type dwarf nova.
TCP_J03005508+1802290_20181213_846_D.Boyd.png
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Re: Request for spectra - ASASSN-18abl (at2018jsc)

Postby Forrest Sims » Fri Dec 14, 2018 9:34 am

And minutes later my similar results with my LISA from half way across the world from David:) Skies were clear for the observation.

Woody
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Re: Request for spectra - ASASSN-18abl (at2018jsc)

Postby Robin Leadbeater » Fri Dec 14, 2018 2:24 pm

It looks like we have good agreement :-)

I have uploaded a longer exposure version of my spectrum to TNS and the BAA database and pointed the ASASSN team to the spectra posted here.

Thanks
Robin
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