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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
[size=13.3333px]AAVSO Alert Notice 551

[size=13.3333px]September 20, 2016

[size=13.3333px]GDS_J1701281-430612 monitoring for HST observations

[size=13.3333px]Dr. Mark Reynolds (University of Michigan) and colleagues have
[size=13.3333px]requested AAVSO assistance in monitoring the cataclysmic variable
[size=13.3333px]GDS_J1701281-430612 in support of HST/COS observations scheduled
[size=13.3333px]for early October.

[size=13.3333px]Dr. Reynolds writes: "[GDS_J1701281-430612] is a cataclysmic variable
[size=13.3333px]binary system. X-ray observations with XMM-Newton have revealed a
[size=13.3333px]15 min pulsation period, and an X-ray spectrum consistent with that
[size=13.3333px]expected from channeled accretion onto a magnetic white dwarf. The
[size=13.3333px]goal of this HST observation is to study the inner accretion flow
[size=13.3333px]from the truncated accretion disk onto the white dwarf."

[size=13.3333px]Beginning now and continuing through late October, V, R, and
[size=13.3333px]I photometry of GDS_J1701281-430612 is requested; the extinction
[size=13.3333px]in blue makes B photometry less valuable and is not recommended.
[size=13.3333px]The HST observing window is October 3-9. Until October 1, nightly
[size=13.3333px]snapshots in VRI are requested to establish a baseline and follow  
[size=13.3333px]the target's behavior. From October 1, observations a few times
[size=13.3333px]per night are requested, then more frequently during the HST
[size=13.3333px]observations themselves at a cadence that allows for a good S/N.
[size=13.3333px]Following the HST observations, nightly snapshots are requested for
[size=13.3333px]about two weeks to provide context.

[size=13.3333px]When the exact date/time of the HST observations is known, observers
[size=13.3333px]will be notified via an AAVSO Special Notice. If you don't already
[size=13.3333px]subscribe to this publication, you may do so at no charge from your
[size=13.3333px]AAVSO web account page.

[size=13.3333px]GDS_J1701281-430612 ranges between about 15.2 R and 16.2 R. Although
[size=13.3333px]V measurements have not been made of this object, according to Dr.
[size=13.3333px]Reynolds optical spectra indicate that V-R should be about zero.
[size=13.3333px]GDS_J1701281-430612 is also known as 2MASS J17012815-4306123.

[size=13.3333px]Coordinates (2000.0):  R.A. 17 01 28.14  Dec. -43 06 12.3

[size=13.3333px]Charts with a comparison star sequence for GDS_J1701281-430612 may
[size=13.3333px]be created using the AAVSO Variable Star Plotter (VSP,
[size=13.3333px]https://www.aavso.org/vsp[size=13.3333px]). Be sure to include the underscore in
[size=13.3333px]the name. Observers should create an 'e' scale chart to see the
[size=13.3333px]sequence.

[size=13.3333px]Please submit observations to the AAVSO International Database
[size=13.3333px]using the name GDS_J1701281-430612 exactly as written here.

[size=13.3333px]This campaign is being followed on the AAVSO Observing Campaigns
[size=13.3333px]webpage ([size=13.3333px]https://www.aavso.org/observing-campaigns[size=13.3333px]). A thread has
[size=13.3333px]been created on the Campaigns and Observation Reports forum at
[size=13.3333px]([size=13.3333px]https://www.aavso.org/content/gdsj1701281-430612-hst-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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