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AR Sco observing campaign

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發表於 2016-8-19 06:49:05 | 顯示全部樓層 |閱讀模式
[size=13.3333px]AAVSO Alert Notice 548

[size=13.3333px]August 18, 2016

[size=13.3333px]AR Sco observing campaign

[size=13.3333px]Dr. Thomas Marsh (University of Warwick) and colleagues have
[size=13.3333px]requested AAVSO coverage of the intriguing binary AR Sco in support
[size=13.3333px]of upcoming Newton-XMM observations.

[size=13.3333px]The XMM observations of AR Sco have been scheduled for:
[size=13.3333px]2016 September 10 15:41 - September 11 02:26 UT

[size=13.3333px]As with all satellite observations, there is always the chance that
[size=13.3333px]Target of Opportunity (TOO) observations of a transient object may
[size=13.3333px]cause the schedule to change. If this should happen, observers will
[size=13.3333px]be alerted via an AAVSO Special Notice and the Campaigns and
[size=13.3333px]Observing Reports Forum.

[size=13.3333px]This fascinating binary system is the subject of an exciting paper
[size=13.3333px]in the July 2016 issue of Nature
[size=13.3333px]([size=13.3333px]http://www.nature.com/nature/journal/vaop/ncurrent/full/nature18620.html[size=13.3333px]).
[size=13.3333px]A pre-print version is available at arXiv ([size=13.3333px]http://arxiv.org/abs/1607.08265[size=13.3333px]).
[size=13.3333px]The article is titled "A radio-pulsing white dwarf binary star" and
[size=13.3333px]the authors are T. R. Marsh, B. T. Gaensicke, S. Huemmerich, F.-J.
[size=13.3333px]Hambsch, K. Bernhard, C. Lloyd, E. Breedt, E. R. Stanway, D. T.
[size=13.3333px]Steeghs, S. G. Parsons, O. Toloza, M. R. Schreiber, P. G. Jonker,
[size=13.3333px]J. van Roestel, T. Kupfer, A. F. Pala, V. S. Dhillon, L. K. Hardy,
[size=13.3333px]S. P. Littlefair, A. Aungwerojwit, S. Arjyotha, D. Koester, J. J.
[size=13.3333px]Bochinski, C. A. Haswell, P. Frank, and P. J. Wheatley. A press
[size=13.3333px]release from the European Southern Observatory is available at
[size=13.3333px]http://www.eso.org/public/news/eso1627/?lang[size=13.3333px] .

[size=13.3333px]Dr. Marsh writes of their research on AR Sco: "...it was down to
[size=13.3333px][the amateurs [who are co-authors] on the paper that we got onto it
[size=13.3333px]in the first place ...It's already past best visibility for this
[size=13.3333px]year, but there will be plenty of opportunity in the future. I
[size=13.3333px]think many observers will find it a fascinating object to study and
[size=13.3333px]it could be accessible to quite a number of them I think (at its
[size=13.3333px]very brightest it gets to V=13.6 although a more typical magnitude
[size=13.3333px]is V=14.8).

[size=13.3333px]"Coverage immediately before, after and (especially) during [the
[size=13.3333px]XMM observations] would be great. The most challenging aspect is the
[size=13.3333px]time resolution: ideally one wants a cadence < 29 seconds because of
[size=13.3333px]the strong harmonic of the basic 2 minute period, and the faster the
[size=13.3333px]better. Observers should use whatever filter (including clear/white
[size=13.3333px]light) is needed to allow them to match this constraint. If they
[size=13.3333px]can't follow it this fast or faster, then it might not be worth
[size=13.3333px]their trying. They need to have accurate timing as well, i.e. they
[size=13.3333px]need to know the centres of the exposures to better than +/- 2
[size=13.3333px]seconds, and preferably better."

[size=13.3333px]Please observe AR Sco beginning now (one to a few times per night),
[size=13.3333px]then switch to the cadence Dr. Marsh requests long enough before
[size=13.3333px]the XMM observations begin to establish a good baseline. Continue
[size=13.3333px]at this cadence through the XMM observations and beyond for at least
[size=13.3333px]another hour.

[size=13.3333px]A page of materials on AR Sco related to the Nature paper may be
[size=13.3333px]found at [size=13.3333px]http://deneb.astro.warwick.ac.uk/phsaap/arsco-info/
[size=13.3333px]Item #9 on that page is a YouTube video of a fascinating movie
[size=13.3333px]Dr. Marsh made of AR Sco from their data. The direct link to the
[size=13.3333px]video is ([size=13.3333px]https://www.youtube.com/watch?v=QJGAv2jCF4s&feature=youtu.be[size=13.3333px]).

[size=13.3333px]Coordinates (2000.0):  R.A. 16 21 47.29   Dec. -22 53 10.4

[size=13.3333px]Charts: Charts with a comparison star sequence for AR Sco
[size=13.3333px]may be created using the AAVSO Variable Star Plotter (VSP) at
[size=13.3333px]https://www.aavso.org/vsp[size=13.3333px].

[size=13.3333px]Please submit observations to the AAVSO International Database
[size=13.3333px]using the name AR SCO.

[size=13.3333px]This campaign is being monitored on the AAVSO Observing Campaigns
[size=13.3333px]webpage at [size=13.3333px]https://www.aavso.org/observing-campaigns[size=13.3333px] and is being
[size=13.3333px]followed on the Campaigns and Observation Reports Forum at
[size=13.3333px]https://www.aavso.org/content/ar-sco-observing-campaign[size=13.3333px] .


[size=13.3333px]This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

[size=13.3333px]----------------------------------
[size=13.3333px]SUBMIT OBSERVATIONS TO THE AAVSO

[size=13.3333px]Information on submitting observations to the AAVSO may be found at:
[size=13.3333px]https://www.aavso.org/webobs

[size=13.3333px]ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

[size=13.3333px]An Alert Notice archive is available at the following URL:
[size=13.3333px]https://www.aavso.org/alert-notice-archive

[size=13.3333px]Subscribing and Unsubscribing may be done at the following URL:
[size=13.3333px]https://www.aavso.org/observation-notification#alertnotices

[size=13.3333px]-------------------------------------------------
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