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AR Sco observing campaign

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發表於 2016-8-19 06:50:28 | 顯示全部樓層 |閱讀模式
AAVSO Alert Notice 548

August 18, 2016

AR Sco observing campaign

Dr. Thomas Marsh (University of Warwick) and colleagues have
requested AAVSO coverage of the intriguing binary AR Sco in support
of upcoming Newton-XMM observations.

The XMM observations of AR Sco have been scheduled for:
2016 September 10 15:41 - September 11 02:26 UT

As with all satellite observations, there is always the chance that
Target of Opportunity (TOO) observations of a transient object may
cause the schedule to change. If this should happen, observers will
be alerted via an AAVSO Special Notice and the Campaigns and
Observing Reports Forum.

This fascinating binary system is the subject of an exciting paper
in the July 2016 issue of Nature
(http://www.nature.com/nature/journal/vaop/ncurrent/full/nature18620.html).
A pre-print version is available at arXiv (http://arxiv.org/abs/1607.08265).
The article is titled "A radio-pulsing white dwarf binary star" and
the authors are T. R. Marsh, B. T. Gaensicke, S. Huemmerich, F.-J.
Hambsch, K. Bernhard, C. Lloyd, E. Breedt, E. R. Stanway, D. T.
Steeghs, S. G. Parsons, O. Toloza, M. R. Schreiber, P. G. Jonker,
J. van Roestel, T. Kupfer, A. F. Pala, V. S. Dhillon, L. K. Hardy,
S. P. Littlefair, A. Aungwerojwit, S. Arjyotha, D. Koester, J. J.
Bochinski, C. A. Haswell, P. Frank, and P. J. Wheatley. A press
release from the European Southern Observatory is available at
http://www.eso.org/public/news/eso1627/?lang .

Dr. Marsh writes of their research on AR Sco: "...it was down to
[the amateurs [who are co-authors] on the paper that we got onto it
in the first place ...It's already past best visibility for this
year, but there will be plenty of opportunity in the future. I
think many observers will find it a fascinating object to study and
it could be accessible to quite a number of them I think (at its
very brightest it gets to V=13.6 although a more typical magnitude
is V=14.8).

"Coverage immediately before, after and (especially) during [the
XMM observations] would be great. The most challenging aspect is the
time resolution: ideally one wants a cadence < 29 seconds because of
the strong harmonic of the basic 2 minute period, and the faster the
better. Observers should use whatever filter (including clear/white
light) is needed to allow them to match this constraint. If they
can't follow it this fast or faster, then it might not be worth
their trying. They need to have accurate timing as well, i.e. they
need to know the centres of the exposures to better than +/- 2
seconds, and preferably better."

Please observe AR Sco beginning now (one to a few times per night),
then switch to the cadence Dr. Marsh requests long enough before
the XMM observations begin to establish a good baseline. Continue
at this cadence through the XMM observations and beyond for at least
another hour.

A page of materials on AR Sco related to the Nature paper may be
found at http://deneb.astro.warwick.ac.uk/phsaap/arsco-info/
Item #9 on that page is a YouTube video of a fascinating movie
Dr. Marsh made of AR Sco from their data. The direct link to the
video is (https://www.youtube.com/watch?v=QJGAv2jCF4s&feature=youtu.be).

Coordinates (2000.0):  R.A. 16 21 47.29   Dec. -22 53 10.4

Charts: Charts with a comparison star sequence for AR Sco
may be created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp.

Please submit observations to the AAVSO International Database
using the name AR SCO.

This campaign is being monitored on the AAVSO Observing Campaigns
webpage at https://www.aavso.org/observing-campaigns and is being
followed on the Campaigns and Observation Reports Forum at
https://www.aavso.org/content/ar-sco-observing-campaign .


This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

----------------------------------
SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at:
https://www.aavso.org/webobs

ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

An Alert Notice archive is available at the following URL:
https://www.aavso.org/alert-notice-archive

Subscribing and Unsubscribing may be done at the following URL:
https://www.aavso.org/observation-notification#alertnotices

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