[vsnet-alert 23912] Re: AT 2019olv - bright (14m) large-amplitude object in Corona Australis

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

 BraTS-SON-T2-007 (= AT 2019olv, ASASSN-19uu) (UGWZ:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=844542
 
Denis Denisenko wrote:
> Large outburst amplitude, rapid fading – may be an AM CVn (IBWD) object.
 
Actually that outburst was more likely a WZ Sge-type superoutburst:
It started on 2019 Aug. 23 and lasted at least until Sept. 13 (Gaia19dwg)
– possibly until Sept. 18 (ASAS-SN Sky Patrol). The last detection was
made by Gaia on Oct. 18 (Gmag. 20.65, still above quiescence).
 
Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data and light curve:
https://asas-sn.osu.edu/light_curves/27241098-d695-4f34-9ea5-0e96c3d21dec

Unfortunately there are only 14 AAVSO observations for this object
(by Peter Starr, SPET):
https://www.aavso.org/apps/webobs/results/?star=BraTS-SON-T2-007

Regards,
Patrick
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     Am Montag, 26. August 2019, 15:35:55 MESZ hat Denis Denisenko d.v.denisenko at gmail.com via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
 I have obtained BVR images of AT 2019olv remotely with iTelescope.Net
T17 on Aug. 26 at 12:38-12:49 UT. The object is blue - likely a dwarf
nova.

AT 2019olv
  20190826.527  14.91R  iTelescope.Net T17
  20190826.530  14.70V  iTelescope.Net T17
  20190826.533  14.44B  iTelescope.Net T17

Reference star used with magnitudes from APASS:
19 13 04.51 -41 28 11.6
V=13.141+/-0.086 B=13.764 r=12.934+/-0.022

Color-combined iTelescope image on Aug. 26.53 UT (10'x10' FOV):
http://scan.sai.msu.ru/~denis/AT2019olv-20190826-T17-RGB.jpg

Large outburst amplitude, rapid fading - may be an AM CVn (IBWD)
object. Time series are encouraged.

Denis Denisenko

On Mon, Aug 26, 2019 at 9:12 AM Denis Denisenko <d.v.denisenko at gmail.com> wrote:
>
> AT 2019olv
>  20190823.0655  >172g  ASAS-SN
>  20190823.2469  >167g  ASAS-SN
>  20190823.8734  15.44g  ASAS-SN
>  20190825.0765  13.85g  ASAS-SN