AAVSO Special Notice #425
November 9, 2016
FO Aqr XMM-Newton observations scheduled
Further to AAVSO Alert Notice 545
(https://www.aavso.org/aavso-alert-notice-545), time series
observations of the intermediate polar cataclysmic variable FO Aqr
are requested to provide simultaneous coverage of XMM-Newton
observations scheduled for 2016 November 13 19:43 UTC to November
14 8:13 UTC.
Dr. Colin Littlefield (University of Notre Dame) writes on behalf
of his colleagues and himself: "We'd be grateful for simultaneous
time-series photometry by AAVSO observers in support of these
observations. Our primary objective for the AAVSO observations is
to see how FO Aqr's X-ray behavior correlates with its optical
"...FO Aqr is the subject of an ongoing AAVSO campaign to monitor
its recovery from the first-ever faint state in its observational
history. A number of AAVSO observers were co-authors on our first
paper about FO Aqr's faint state [Littlefield et al., 2016,
accepted for publication in ApJ; https://arxiv.org/abs/1609.01026].
"We would ask that observers use a cadence of 60 seconds or less.
Regarding the bandpass, we would prefer either Johnson V or
unfiltered with a V zeropoint. It is also important that observers
ensure the accuracy of their computer clocks [to within a few
After the XMM-Newton observations are over, please continue the
time-series observations until the end of 2016. Observations in
the AAVSO International Database show that FO Aqr is brightening
from its faint state; Dr. Littlefield feels it will likely return
to its original brightness of V~13.4 within a month, and says that
he and his colleagues would appreciate the data continuing for a
few weeks after that.
Coordinates (2000.0): R.A. 22 17 55.38 Dec. -08 21 03.8
Charts: Charts with a comparison star sequence for FO Aqr may be
created using the AAVSO Variable Star Plotter (VSP) at
https://www.aavso.org/vsp. For observers who have been following
FO Aqr as part of the CBA program, the comparison stars used for
that program have been retained.
Please submit observations to the AAVSO International Database
using the name FO AQR.
This campaign is being monitored on the AAVSO Observing Campaigns
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
ACTIVITY AT A GLANCE
New outbursts and unusual activity reported in the last 72 hours
Last updated 14:09 UT December 01, 2016
# indicates a noteworthy or unusual outburst
: indicates confirmation required
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.
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