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17 Cataclysmic variables to be observed by William HerschelTelescope
Roque Ruiz-Carmona (Ph.D. candidate, Institute ofMathematics, Astrophysics and Particle Physics, Radboud University Nijmegen,The Netherlands) has requested AAVSO assistance with his campaign to observe (anew set of) 17 cataclysmic variables (CVs) with the William Herschel Telescope(WHT) next week. This campaign is nearly identical in format to the one carriedout by the AAVSO on his behalf in July (AAVSO Alert Notice 524). The success ofthat campaign prompted him to ask for the AAVSO's assistance in this newcampaign.
In order for WHT to observe each of the targets safelyand to maximize the science value of the observations obtained, it is essentialto know whether they are in outburst or quiescence. To this end, the PI hasrequested our observers to obtain one image of each target on each of TWOseparate nights so he may analyze them to determine the final observing listfor WHT.
One image of every target should be obtained:
- between 31August 17:00UT and 1 September 17:00 UT - between 1September 17:00UT and 2 September 17:00 UT
***The images must be posted to the thread no later than 2 September 18:00 UT.***
Observers should post their images to the thread("Second 17 PTF CVs
It is not necessary for observers to determine and submita magnitude estimate of each target, just to obtain the images and place themwhere the PI can access them. Any filter may be used, and raw or reduced imagesof each target may be posted in the forum.
**Only one image per observer per target per night shouldbe submitted. Please do not submit multiple images of any target obtained byyou on the same night.**
An observer does not have to take images of the sametargets on both nights (although that would be ideal); if conditions changebetween the nights, whatever images can be obtained will be extremely helpful.
The table of targets is given below. Some of the targetsare quite faint, and stacking of images may be necessary. The maximum size ofan image file that can be uploaded to the Forum thread is 40 MB, so if anyfiles are larger, please trim the image(s).
PTF ID PrimaryName RA (2000) Dec (2000) Mag_min Mag_max Type Priority PTFS1101b OTJ012059.6+325545 01:20:59.60 +32:55:44.8 20.0 CV 12.1 V UGWZ High PTFS1201n AY Psc 01:36:55.46 +07:16:29.2 17.4 CR 14.4 CR UGZ+E High PTFS1101aa BGAri 01:51:51.88 +14:00:47.2 20 CV 14.7 CV UGSU High PTFS1402au CSS101214:021308+184416 02:13:07.96 +18:44:15.8 19.75 r 15.86 CV UG High PTFS1103i CPEri 03:10:32.78 -09:45:06.3 19.7 V 16.1 V UG/IBWD High PTFS1118x V344Lyr 18:44:39.17 +43:22:28.1 19 V 13.8 V UGSU High PTFS1119h V1504Cyg 19:28:56.45 +43:05:37.3 17.4 p 13.5 p UGSU High PTFS1120q SDSSJ204817.85-061044.8 20:48:17.87 -06:10:45.0 20 CR 14.9 CR UGSU High PTFS1120t QTAqr 20:59:14.87 -06:12:20.5 19.3 CV 15.2 CV UG High PTFS1121y QU Aqr 21:00:14.11 +00:44:46.0 18.8 V 16.1 V UGSU High PTFS1121aq CSS110513:210846-035031 21:08:46.44 -03:50:32.6 19.6 CV 14.9 CV UGSS+E High PTFS1121at PNVJ21095047+1348396 21:09:50.47 +13:48:39.5 19 R 11.5 R UGWZ High PTFS1121b VZAqr 21:30:24.63 -02:59:17.6 18.4 V 12.0 V UGSS High PTFS1122u SDSSJ220553.98+115553.7 22:05:53.99 +11:55:53.7 21.1 CV 14.3 CV UGWZ High PTFS1122as V521Peg 22:21:44.79 +18:40:08.3 17.5 V 11.8 V UGSU High PTFS1122t V367Peg 22:45:00.73 +16:55:13.3 18.02 r 15.8 B UG High PTFS1123ac NSV14652 23:38:48.67 +28:19:54.9 19.2 CV 14.9 CV UGSU High
Observers should use a combination of AAVSO charts andcharts supplied by the PI. Finder charts with sequences may be created usingthe AAVSO Variable Star Plotter (VSP, http://www.aavso.org/vsp). PDF images of PTF (Palomar Transient Factory) close-upfinder charts containing the targets and offset stars chosen by the PI may bedownloaded here: Please be sure that each image includes the offset stars,especially if you trim it so its size is less than 40MB.
Because the windows for observation by AAVSO observersare relatively short and the target list is quite long, it is recommended thatobservers coordinate their observing plans so that all of the targets arecovered on both nights if at all possible. Please use the forum thread givenabove to post what targets you plan to observe; if you see that more difficulttargets are not being covered and you can observe them, your doing so would begreatly appreciated.
Once all images have been posted to the campaign thread,observers are encouraged to reduce their images **using the sequences availablevia VSP**, and submit them to the AAVSO International Database using theprimary names (not PTF names) as given in the table above. DO NOT USE MAGNITUDES GIVEN IN THE PTF CHARTS FOR DATAREDUCTION.
This AAVSO Alert Notice was compiled by Elizabeth O.Waagen.
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發表於 2015-8-27 11:08:48