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NR TrA (Nova TrA 2008) monitoring in support of XMM observations

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發表於 2017-3-8 08:54:53 | 顯示全部樓層 |閱讀模式
[size=13.3333px]AAVSO Alert Notice 570

[size=13.3333px]March 7, 2017

[size=13.3333px]NR TrA (Nova TrA 2008) monitoring in support of XMM observations

[size=13.3333px]Dr. Fred Walter (Stony Brook University) has requested AAVSO
[size=13.3333px]observers' assistance in monitoring NR TrA (Nova TrA 2008) in
[size=13.3333px]support of upcoming XMM Newton observations. The XMM observations
[size=13.3333px]will take place 2017 March 13 06:21 through March 14 10:34 UT.

[size=13.3333px]Dr. Walter writes: "NR TrA (Nova TrA 2008) is a compact eclipsing
[size=13.3333px]system with a 5.5 hour period. It was a normal Fe II nova that,
[size=13.3333px]upon reaching quiescence, took on the appearance of a super-soft
[size=13.3333px]source in the optical high state, which suggests an extremely high
[size=13.3333px]mass accretion rate. The optical spectrum is dominated by hot
[size=13.3333px]permitted lines of O VI, N V, C IV, and He II. Some nova-like
[size=13.3333px]variables have similar spectra, though generally without the hot
[size=13.3333px]emission lines.

[size=13.3333px]"Primary eclipse is broad - nearly 40% of the orbit - and deeper at
[size=13.3333px]shorter wavelengths, which suggests the eclipse of a hot accretion
[size=13.3333px]disk. Primary eclipse depth is about 1 mag at V. There appears to
[size=13.3333px]be a shallow secondary eclipse.

[size=13.3333px]"We have a day-long XMM observation of NR TrA scheduled starting at
[size=13.3333px]0621 UT 13 March and running through 1034 UT 14 March. The primary
[size=13.3333px]aim is to detect and characterize the eclipse at X-ray and UV
[size=13.3333px]wavelengths. We will obtain low cadence BVRI/JHK observations with
[size=13.3333px]SMARTS/Andicam.

[size=13.3333px]"We request AAVSO support to obtain continuous photometric time
[size=13.3333px]series simultaneous with the XMM observation. Any filters are
[size=13.3333px]acceptable, but standard Johnson B, V or Cousins R, I are preferred.
[size=13.3333px]Clear filters are acceptable. Differential photometry is acceptable,
[size=13.3333px]as the shape and depth of the eclipse is of paramount importance;
[size=13.3333px]we can calibrate after the fact. Time resolution better than 5
[size=13.3333px]minutes and uncertainties (outside of eclipse) <0.02 mag are
[size=13.3333px]preferred.

[size=13.3333px]"The current out-of-eclipse V magnitude is about 16.5. The B-V and
[size=13.3333px]V-I colors are both about 0.3. The best ephemeris I have is:

[size=13.3333px]      minimum light at JD 55956.822 + 0.219109E

[size=13.3333px]This is based on data from 2013-2015."

[size=13.3333px]Dr. Walter adds that while obtaining exactly simultaneous
[size=13.3333px]observations would be ideal and so preferred, obtaining a good
[size=13.3333px]light curve within a few days of the XMM observations is crucial.

[size=13.3333px]Beginning now, observers are requested to monitor NR TrA with
[size=13.3333px]nightly snapshots through March 9, then switch to the cadence given
[size=13.3333px]above and - paying particular attention to the XMM observation
[size=13.3333px]interval - continue time series through March 18, and then return
[size=13.3333px]to nightly snapshots through March 22.

[size=13.3333px]Coordinates for NR TrA: R.A. 16 18 48.21  Dec. -60 27 49.2  (2000.0)

[size=13.3333px]Charts: Charts with a comparison star sequence for NR TrA may be
[size=13.3333px]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 NR TRA. IF YOU SUBMIT DIFFERENTIAL PHOTOMETRY, be
[size=13.3333px]sure that in your data file, the MTYPE field reads DIF.

[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/nr-tra-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]-------------------------------------------------

[size=13.3333px]Please support the AAVSO and its mission -- Join or donate today:
[size=13.3333px]https://www.aavso.org/apps/donate/



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