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VY Aqr in outburst

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SPK
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VY Aqr in outburst

VY Aquarii (UGSU)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=888

Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany:
AQRVY 20201105.74 <130 SPK
AQRVY 20201106.742 112 SPK
Sequence: AAVSO (V magnitudes)
Instrument: 203-mm SCT

Confirmed by Gary Poyner (Birmingham, UK) as follows:
Nov 06.777    11.4     22cm

The previously recorded outburst (a normal one?) was observed from 2015 March 28 to April 1.

Time-resolved photometry during the current outburst is encouraged.

Clear skies,
Patrick

gsivakoff
Campaign planning

I'd love to start a campaign on this object without supplanting Patrick. Christian Knigge, severall collaborators, and myself are looking to put together as much as we can on this outburst. In particular, we are also hoping to get radio data (likely due to a relativistic jet) to complement the optical and UV data that largely trace the accretion disk. Multiple filters allow us to constrain the broad band spectrum of the source, which is often an important constraint for science. Elizabeth, can we start a co-requested alert, keeping Patrick involved?

We are still working on setting filter, candence, and SNR requirements. We will update you when we can.

At a minimum I would love to get multiple filters (including Visual, U, B, V, R, I, to your best abilities) a day, perhaps even once per hour. I am unsure if we will request higher cadence observations. Spectroscopy around H alpha (6563 Angstrom) and 5000 Angstrom would be interesting as well.

The source is currently brighter than 11th magnitude (and maybe even brigther than 10th magnitude). The quiescent level is more along 17 th magnitude. We have requested and been granted Swift observations to capture the X-rays and the simultaneous UV, U, B, V magnitude once per day, likely from November 11-20 (we're trying to get on scope faster). We will observe with the South African MeerKAT radio telescope at least once on November 8 at 11:40-13:40 UT. We will likely observe multiple times with MeerKAT.

Oftentimes dwarf nova outbursts only last a week or so, so let's all cross our fingers for clear skies and fireworks.

Sincerely,
Greg Sivakoff

SPK
SPK's picture
Re: Campaign planning

Greg, Christian, et al., thanks a lot for the proposal!

Quote: "Oftentimes dwarf nova outbursts only last a week or so, ..."
The current outburst of VY Aquarii is very likely a superoutburst and is expected to last about two weeks (the usual duration of standard SU UMa-type outbursts).

Clear skies,
Patrick

SPK
SPK's picture
Some previous outbursts

According to AAVSO data, a normal outburst was observed 2006 October 7–11, and a superoutburst 2008 July 1–16 (followed by a rebrightening July 21–23). An outburst of unclear nature was observed from 2015 March 28 to April 1 by Rod Stubbings and the All-Sky Automated Survey for Supernovae (ASAS-SN).

Patrick

hambsch
hambsch's picture
Time series

I have taken time series from my remote observatory in Chile. Unfortunately it was cloudy. The target is at around mag 9.8 (CV) and only a few images were good. WIll be submitted to the AAVSO database. I have changed my script to take B, V filtered images from tonight onwards.

Josch

gsivakoff
Campaign Plans

This white dwarf has a companion that orbits it every 0.06309 d  (90.85 min) that supplies the material the white dwarf accretes. So changes to the source emission may happen on more rapid timescale than daily observations. AAVSO observers can play a major role in this campaign. To first order, a superoutburst will likely last around two weeks, as Patrick said. Towards the end of the outburst, the source will decay towards its quiescent emission (mostly from the companion star) of 17th mag Visual. So we expect around 7 mags of changing optical emission over the outburst, with the AAVSO observers playing critical roles.

 

We have six priorities for AAVSO observers. Please pick one given your capacity and interest.

  1. Capture B V timeseries data at as rapidly as possible a cadence given the magnitude of the source when you observe. Please observe B V B V B V ....
  2. Capture V timeseries data at as rapidly as possible a cadence given the magnitude of the source when you observe.
  3. Capture Visual (Vis or CV) timeseries data at as rapidly as a possible cadence given the magnitude of the source when you observe.
  4. Capture U B V timeseries data at as rapidly as possible a cadence given the magnitude of the source when you observe. Please observe U B V U B V U B V ....
  5. Capture spectra across as much of the optical range as possible (6563 Angstrom and ~5000 Angstrom are the most critical) at least once per day. It is important to be sensitive to absorption lines that will be fainter than the continuum level in your spectra.
  6. Capture spectra across as much of the optical range as possible (6563 Angstrom and ~5000 Angstrom are the most critical) as rapidly as your instrument will allow. It is important to be sensitive to absorption lines that will be fainter than the continuum level in your spectra.
GKI
GKI's picture
VY Aqr

Hi folks, I've just submitted a simple visual observation for 2030UT November 8th.

I estimate it's visual magnitude at 9.5 before clouds rolled in.....

Keith.

Deconinck Michel
Deconinck Michel's picture
Indeed, yesterday I made a 9

Indeed, yesterday I made a 9.6 magnitude estimation, as usual in pure visual.

A nice target !

weo
weo's picture
VY Aqr campaign announced - Alert Notice 724

AAVSO Alert Notice 724 announces an observing campaign on the cataclysmic variable VY Aqr. Please see the notice for details and observing instructions.

There are threads for this campaign under the following forums:

- Campaigns and Observation Reports: https://www.aavso.org/vy-aqr-campaign
- Cataclysmic Variables: https://www.aavso.org/vy-aqr-outburst
- Spectroscopy: https://www.aavso.org/vy-aqr-campain
- Time-Sensitive Alerts: https://www.aavso.org/comment/74849
Please subscribe to these threads if you are participating in the campaign so you can be updated by the astronomers and by HQ. Join in the discussion or ask questions there!

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

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