[vsnet-alert 24191] Re: ZTF20aaurhdm: dwarf nova outburst (13.9 mag) in Hercules

Keisuke Isogai isogai at kusastro.kyoto-u.ac.jp
Fri Apr 17 15:53:00 JST 2020

The spectrum of TNS does not show strong He I absorptions:
Kojiguchi-san may have confused with other lines.

In any case, the large amplitude suggests a WZ Sge-type superoutburst.
So time-series observations are encouraged. The last night observation
by Kyoto U. team showed a modulation like an ordinary superhump.

On 2020/04/17 4:15, Kojiguchi Naoto wrote:
> Re: ZTF20aaurhdm: dwarf nova outburst (13.9 mag) in Hercules
>     According to the spectrum reported to TNS by Padova-Asiago group,
> the spectrum shows a blue continuum with  Balmer and He I absorption lines.
> Both absorption lines have similar strength to each other.
> Thus, this object is a good candidate for an EI Psc-type object.
> On 2020/04/17 2:25, Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert wrote:
>> ZTF20aaurhdm  (UG)
>> https://www.aavso.org/vsx/index.php?view=detail.top&oid=1543864
>>   Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
>> and Kochanek et al. 2017PASP..129j4502K) light curve and data:
>> https://asas-sn.osu.edu/light_curves/e57c75d2-eea2-4903-a3aa-cc0febf15f2d
>>   ZTF light curve:
>> https://lasair.roe.ac.uk/object/ZTF20aaurhdm/
>>   In outburst since at least April 8 (amplitude 8 magnitudes).
>> Time-resolved photometry is required.
>>   Clear skies,
>> Patrick

More information about the vsnet-alert mailing list