Request for spectra - ASASSN-18abl (at2018jsc)

Post Reply
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

Request for spectra - ASASSN-18abl (at2018jsc)

Post by Robin Leadbeater »

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
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

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

Post by Robin Leadbeater »

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
Attachments
at2018jsc_20181213_769_Leadbeater.png
at2018jsc_20181213_769_Leadbeater.png (34.95 KiB) Viewed 6237 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
David Boyd
Posts: 161
Joined: Wed Dec 11, 2013 5:50 pm

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

Post by David Boyd »

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
TCP_J03005508+1802290_20181213_846_D.Boyd.png (55.45 KiB) Viewed 6218 times
David
Forrest Sims
Posts: 86
Joined: Thu Feb 09, 2017 5:52 pm

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

Post by Forrest Sims »

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

Woody
Attachments
at2018jsc_20181214_131_Forrest Sims annotated.png
Robin Leadbeater
Posts: 1926
Joined: Mon Sep 26, 2011 4:41 pm
Contact:

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

Post by Robin Leadbeater »

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