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YZ Cnc Chandra observing campaign

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發表於 2016-12-20 06:31:46 | 顯示全部樓層 |閱讀模式
[size=13.3333px]AAVSO Alert Notice 565

[size=13.3333px]December 19, 2016

[size=13.3333px]YZ Cnc Chandra observing campaign


[size=13.3333px]Dr. Christian Knigge (University of Southampton) and colleagues
[size=13.3333px]have requested AAVSO coverage of the SU UMa-type dwarf nova YZ Cnc
[size=13.3333px]in support of Chandra X-ray observations to be carried out via a
[size=13.3333px]Target of Opportunity (TOO) triggering when the system is in a
[size=13.3333px]suitable outburst.

[size=13.3333px]YZ Cnc has normal outbursts about every 7-10 days, and
[size=13.3333px]superoutbursts about every 100-110 days. The astronomers are
[size=13.3333px]planning to use a superoutburst to trigger the TOO observations.

[size=13.3333px]The last well-documented superoutburst occurred in March 2016, and
[size=13.3333px]a possible superoutburst was observed in June 2016. No
[size=13.3333px]superoutburst was seen in September, but YZ Cnc was just emerging
[size=13.3333px]from conjunction so there were very few observations. The next
[size=13.3333px]superoutburst of YZ Cnc, expected in late December-early January,
[size=13.3333px]may or may not be well placed for Chandra's schedule, so monitoring
[size=13.3333px]may need to continue through more than one superoutburst before the
[size=13.3333px]TOO observations can be triggered. Once the TOO observations have
[size=13.3333px]been triggered, coverage will need to continue through at least one
[size=13.3333px]normal outburst after the Chandra observations have been completed.

[size=13.3333px]Good coverage of YZ Cnc from AAVSO observers this season is
[size=13.3333px]essential; your observations will be used to decide when to trigger
[size=13.3333px]the TOO observations. An AAVSO Special Notice with further
[size=13.3333px]instructions will be issued when the Chandra observations are
[size=13.3333px]triggered, so please be sure to subscribe to the Special Notices.
[size=13.3333px]Subscription to Special Notices (free) is via the Email Settings
[size=13.3333px]tab on your My Account page on the AAVSO website.

[size=13.3333px]Please observe YZ Cnc beginning now (one to a few times, widely
[size=13.3333px]spaced, per night), continuing until the Chandra observations have
[size=13.3333px]been carried out and the end of the campaign is announced. Visual
[size=13.3333px]and V or CV band observations are requested; other bands are
[size=13.3333px]welcome but are not essential. Please report your observations to
[size=13.3333px]the AAVSO via WebObs as soon after you make them as possible,
[size=13.3333px]especially if you see YZ Cnc at visual magnitude 13.8 or brighter.
[size=13.3333px]Typical normal outbursts reach visual magnitude ~12.0, and
[size=13.3333px]superoutbursts ~11.0-11.3. In recent years at minimum YZ Cnc has
[size=13.3333px]been ~14.6-14.8.

[size=13.3333px]Coordinates (2000.0):  R.A. 08 10 56.65   Dec. +28 08 33.2

[size=13.3333px]Charts: Charts with a comparison star sequence for YZ Cnc 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 YZ CNC.

[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/yz-cnc-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]-------------------------------------------------
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