AAVSO Alert Notice 517
April 2, 2015
Monitoring of AM Her urgently requested in support of XMM-Newton and NuSTAR observations
Dr. Axel Schwope (Leibniz Institute for Astrophysics Potsdam,
Germany) has requested AAVSO observers' assistance in monitoring
the magnetic variable AM Her in support of upcoming XMM-Newton plus
NuSTAR (Nuclear Spectroscopic Telescope Array) observations.
The XMM-Newton observations are scheduled for 2015 April 06
02:37:02-15:07:02 UT. The NuSTAR observations have not been made
final yet but are expected to run longer. A Special Notice will be
issued when the NuSTAR schedule is known.
Observers are requested to observe AM Her using standard BVRI
filters (V filter preferred). The preferred manner of observing is
to use only one filter and observe with the highest possible time
resolution (aiming for a S/N=10). Dr. Schwope writes that timing
accuracy is an issue for these observations and all CCD clocks need
to be synchronized via NTP.
Observations are requested nightly from now until April 4, then
time series observations through April 8, and then nightly
observations through April 16.
The prototype of the class of magnetic cataclysmic variables known
as polars, AM Her has "high" and "low" states, ranging approximately
V=12.7-13.8 in its high state and V=15.3-15.7 in its low state.
Currently it is in its high state at visual magnitude 13.2 on 2015
March 30.107 UT (JD 2457111.607, G. Poyner, Birmingham, England).
Its orbital period is 3.1 hours.
To learn more about polars and AM Her, see the AAVSO Variable Star
of the Season web presentation "AM Herculis"
(http://www.aavso.org/vsots_amher).
Coordinates: R.A. 18 16 13.34 Dec. +49 52 04.1 (2000.0)
Charts with a comparison star sequence for AM Her may be created
using the AAVSO Variable Star Plotter (VSP, http://www.aavso.org/vsp).
Please submit observations to the AAVSO International Database
using the name AM HER.
This campaign is being followed on the AAVSO Observing Campaigns
page (http://www.aavso.org/observing-campaigns).
Your filtered photometry is extremely important for these
observations, and your contributions are greatly appreciated.
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:
http://www.aavso.org/webobs
ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION
An Alert Notice archive is available at the following URL:
http://www.aavso.org/alert-notice-archive
Subscribing and Unsubscribing may be done at the following URL:
http://www.aavso.org/observation-notifi ... ertnotices
-------------------------------------------------
Monitoring of AM Her urgently requested in support of XMM-Ne
Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
solar research, comet observation, astrometry, etc.
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