[vsnet-alert 24710] V493 Gem missed superoutburst(?): third rebrightening (Sept. 19)

Mon Sep 21 03:02:43 JST 2020

 V493 Geminorum = ASASSN-14mv (AM CVn star, HeDN)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=399953

A third (re?)brightening was observed on 2020 Sept. 19, according
to recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data:
https://asas-sn.osu.edu/light_curves/74c5551f-6d0e-4ebf-b675-b7dcf3dab505

A second (re?)brightening was detected on Sept. 9 by Josch Hambsch:
https://www.aavso.org/apps/webobs/results/?star=V493+Gem

The interval between these (short) outbursts is 10 days, compared to
7 days in 2015 (when at least 10 rebrightenings were observed).

Time-resolved photometry or (at least) snapshots are encouraged.

Clear skies,
Patrick
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     Am Mittwoch, 2. September 2020, 19:44:39 MESZ hat Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

  I think we missed (at least) the main (super)outburst.
The initially detected state above quiescence was probably
a plateau phase after the (missed) supermaximum.
However, more normal (i.e. short) "echo" outbursts
may occur (every ~6 days).

Clear skies,
Patrick
-------
    Am Mittwoch, 2. September 2020, 17:39:22 MESZ hat Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

  The brightening on 2020 August 30 was only a short one
(normal outburst), as V493 Gem is back at mag. 15.9 on
September 2 (Josch Hambsch and ASAS-SN Sky Patrol):
https://www.aavso.org/apps/webobs/results/?star=V493+Gem
https://asas-sn.osu.edu/light_curves/07b93087-d500-4987-af78-001e05526236

Further brightenings may occur (soon).

Clear skies,
Patrick
-------
    Am Montag, 31. August 2020, 22:15:03 MESZ hat Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

  V493 Geminorum = ASASSN-14mv (AM CVn star, "helium dwarf nova")
https://www.aavso.org/vsx/index.php?view=detail.top&oid=399953

Recent 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/aac6cc91-df12-493e-9951-f4b2a6429dbf

AAVSO data (latest observations by Josch Hambsch, HMB):
https://www.aavso.org/apps/webobs/results/?star=V493+Gem

At mag. ~15.6 on August 23-29, then a further (sudden)
brightening to mag. 12.7 on August 30.

Time-resolved photometry is encouraged.

Clear skies,
Patrick
-------

    Am Donnerstag, 27. August 2020, 01:12:51 MESZ hat Taichi Kato <tkato at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

 V493 Gem (AM CVn) outburst

http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia20dyy/
Gaia20dyy    AT2020sak    2020-08-24 19:48:46    108.36359    20.93121    15.60    17.95    0.63    CV    2020-08-26 10:58:28    outburst in known AM CVn star V0493 Gem (ASASSN-14mv)

  The last outburst was in 2015 (superoutburst with
rebrightenings).  There have apparently been no major
(WZ Sge-type) outburst since then.