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Observing campaign on 17 cataclysmic variables
Roque Ruiz-Carmona (Ph.D. candidate, Institute ofMathematics, Astrophysics and Particle Physics, Radboud University Nijmegen,The Netherlands) has requested AAVSO assistance with hiscampaign to observe 17 cataclysmic variables (CVs) with the William HerschelTelescope (WHT) next week.
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 an image of each of the targets so he mayanalyze them. For this campaign, it is not necessary for observers to determineand submit a magnitude estimate of each target, just to obtain an image andplace it where the PI can access it.
Any filter may be used, and a raw or reduced image ofeach target may be submitted. **Only one image per observer per target shouldbe submitted. Please do not submit multiple images of any target.**
Observers should post their images to a thread ("17PTF CVs campaign") that has been created in the AAVSO Campaigns &Observation Reports forum ( http://www.aavso.org/17-ptf-cvs-campaign),and include the date/time, filter, and exposure in the posting.
Timing is very important because the PI has to decidewhether to exclude any target(s) 24 hours in advance of the WHT observations. Thus, the images must be taken and posted within acertain window.
The WHT observations will take place 2015 July 22-26 UT.The images must be taken between 21 July 20:00 UT and 22 July 15:00 UT. Theymust be posted to the thread not later than 22 July 19:00 UT.
The table of targets is given below (r values are Sloanmagnitudes). Some of the targets are quite faint, and stacking ofimages may be necessary. The maximum size of an image file that can be uploadedto the Forum thread is 40 MB, so if any files are larger, please trim theimage(s).
PTF ID PrimaryName RA (2000) Dec (2000) r_quiesc. r_outb. Type Priority PTFS1116aq VWCrB 16:00:03.70 +33:11:14.0 18.10 15.00 UGSU High PTFS1116al V844Her 16:25:01.76 +39:09:26.5 17.56 13.50 UGSU High PTFS1116ae SDSSJ162520.29+120308.7 16:25:20.30 +12:03:08.8 17.94 13.50 UGSU Medium PTFS1116cc V592Her 16:52:42.97 +70:30:14.6 16.94 14.25 UGWZ Medium PTFS1116ci SDSSJ165359.06+201010.4 16:53:59.05 +20:10:10.6 17.66 15.25 UGSU+E Medium PTFS1116av 1RXSJ165658.7+212141 16:56:58.13 +21:21:39.3 17.33 14.75 NL Medium PTFS1117q 1RXSJ174827.1+505053 17:48:27.88 +50:50:39.8 17.86 14.50 UGSU High PTFS1118x V344Lyr 18:44:39.17 +43:22:28.1 18.87 14.50 UGSU High PTFS1119h V1504Cyg 19:28:56.45 +43:05:37.3 17.24 15.00 UGSU High PTFS1120ac 1RXSJ203242.4+104937 20:32:42.44 +10:49:34.7 17.46 15.50 CV (X-ray) Medium PTFS1121m FXCep 21:03:06.60 +66:10:32.4 18.33 15.25 UGSS High PTFS1121o V364Peg 21:12:29.58 +12:32:04.6 19.32 15.50 UGSU High PTFS1121b VZ Aqr 21:30:24.63 -02:59:17.6 17.08 14.00 UGSS High PTFS1121aa HS2141+1231 21:43:54.60 +12:44:57.9 15.62 15.00 NL Medium PTFS1122t V367Peg 22:45:00.73 +16:55:13.3 18.02 15.75 UG Medium PTFS1123n V369Peg 23:03:41.81 +17:17:55.0 19.26 16.00 UGSU High PTFS1123l USNO-B1.0 1053-00654452 23:33:25.92 +15:22:22.2 18.29 16.50 DQ Medium
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). Please be sure that an image includes the offset stars,especially if you trim it so its size is less than 40MB.
Because the window for observation by AAVSO observers isrelatively short and the target list is quite long, it is recommended thatobservers coordinate their observing plans so that all of the targets (bothhigh and medium priority) are covered if at all possible. Please use the forumthread given above to post what targets you plan to observe; if you see thatmore difficult targets are not being covered and you can observe them, yourdoing so would be greatly 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 2015-7-17 08:35:36