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GDS_J1701281-430612 monitoring for HST observations

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發表於 2016-9-21 05:32:05 | 顯示全部樓層 |閱讀模式
AAVSO Alert Notice 551

September 20, 2016

GDS_J1701281-430612 monitoring for HST observations

Dr. Mark Reynolds (University of Michigan) and colleagues have
requested AAVSO assistance in monitoring the cataclysmic variable
GDS_J1701281-430612 in support of HST/COS observations scheduled
for early October.

Dr. Reynolds writes: "[GDS_J1701281-430612] is a cataclysmic variable
binary system. X-ray observations with XMM-Newton have revealed a
15 min pulsation period, and an X-ray spectrum consistent with that
expected from channeled accretion onto a magnetic white dwarf. The
goal of this HST observation is to study the inner accretion flow
from the truncated accretion disk onto the white dwarf."

Beginning now and continuing through late October, V, R, and
I photometry of GDS_J1701281-430612 is requested; the extinction
in blue makes B photometry less valuable and is not recommended.
The HST observing window is October 3-9. Until October 1, nightly
snapshots in VRI are requested to establish a baseline and follow  
the target's behavior. From October 1, observations a few times
per night are requested, then more frequently during the HST
observations themselves at a cadence that allows for a good S/N.
Following the HST observations, nightly snapshots are requested for
about two weeks to provide context.

When the exact date/time of the HST observations is known, observers
will be notified via an AAVSO Special Notice. If you don't already
subscribe to this publication, you may do so at no charge from your
AAVSO web account page.

GDS_J1701281-430612 ranges between about 15.2 R and 16.2 R. Although
V measurements have not been made of this object, according to Dr.
Reynolds optical spectra indicate that V-R should be about zero.
GDS_J1701281-430612 is also known as 2MASS J17012815-4306123.

Coordinates (2000.0):  R.A. 17 01 28.14  Dec. -43 06 12.3

Charts with a comparison star sequence for GDS_J1701281-430612 may
be created using the AAVSO Variable Star Plotter (VSP,
https://www.aavso.org/vsp). Be sure to include the underscore in
the name. Observers should create an 'e' scale chart to see the
sequence.

Please submit observations to the AAVSO International Database
using the name GDS_J1701281-430612 exactly as written here.

This campaign is being followed on the AAVSO Observing Campaigns
webpage (https://www.aavso.org/observing-campaigns). A thread has
been created on the Campaigns and Observation Reports forum at
(https://www.aavso.org/content/gdsj1701281-430612-hst-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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