AAVSO Alert Notice 564
December 12, 2016
21 Cataclysmic variables to be observed by William Herschel Telescope
Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics,
Astrophysics and Particle Physics, Radboud University Nijmegen,
The Netherlands) has requested AAVSO assistance with his campaign
to observe a set of 21 cataclysmic variables (CVs) with the
William Herschel Telescope (WHT) at La Palma on **2016 December 16**.
This campaign is essentially identical in format to the ones
successfully carried out by the AAVSO on his behalf in 2015 and in
May 2016 (AAVSO Alert Notices 524, 527, 543).
Ruiz-Carmona writes: "As the end of my PhD is closer now, this is
the second-to-last campaign monitoring CVs into outburst. As an
update on my research, it seems that unexpectedly spiral density
waves can only be detectable in high inclination systems and it
seems that the luminosity of the disk in outburst outshines the
spiral pattern for the rest of the system. This can also have deep
implications: it can be that the spiral density waves are only an
effect of the atmospheres of the disks and are therefore unrelated
to transport of matter and angular momentum in the disks. In order
to investigate this hypothesis, the sample of CVs I would like to
monitor contains only eclipsing systems.
"[As before,] I just need to know if the targets are in outburst
or not. Even non detection can be useful, because it means that
the systems are in quiescence. I prefer R filter but anything will
do (even no filter)..."
The PI has requested AAVSO observers to obtain one image of each
target on each of TWO separate nights so he may analyze them to
determine the final observing list for WHT.
One image of every target should be obtained:
- between 14 December 15:00 UT and 15 December 15:00 UT
- between 15 December 15:00 UT and 16 December 15:00 UT
***The images must be posted to the thread on the AAVSO Campaigns
forum no later than December 16 16:00 UT.***
Observers should post their images to the thread ("21 PTF CVs
campaign") in the AAVSO Campaigns & Observation Reports forum
(https://www.aavso.org/content/21-ptf-cvs-campaign), and include
the date/time, filter, and exposure in the posting. Raw or reduced
images of each target may be posted on the forum. It is not
necessary for observers to determine and submit a magnitude
estimate of each target.
**Only one image per observer per target per night should be
submitted. Please do not submit multiple images of any target
obtained by you on the same night.**
An observer does not have to take images of the same targets on both
nights (although that would be ideal); if conditions change between
nights, whatever images can be obtained will be extremely helpful.
The table of targets is given below. Some of the targets are quite
faint, and stacking of images may be necessary. The maximum size of
an image file that can be uploaded to the Forum thread is 40 MB,
so if any files are larger, please trim the image(s).
AAVSO
PTF name Primary name (VSX) RA (2000) DEC (2000) PTF Outburst Photometry Type Priority
Ref mag mag Min Max
PTFS1523ak ASASSN-15nv 23:42:26.22 +32:48:19.80 17.07 17.00 19.6 CV 15.3 V UG+E Medium
PTFS1500w 2MASS J00353571+4623524 00:35:35.70 +46:23:53.10 15.66 15.0 18.5 V 14.5 V UG+E High
PTFS1500bs 2MASS J00382703+2509250 00:38:27.00 +25:09:25.10 18.82 18.5 18.6 CR 14.6 CR UGSU Medium
HT Cas 1RXS J011013.6+600431 01:10:13.00 +60:04:36.10 19.00 ---- 19.3 V 12.6 V UGSU+E Medium
PTFS1501br CSS 081220:011614+092216 01:16:13.80 +09:22:16.10 18.86 17.5 19.0 CV 16.1 CV UG+E High
PTFS1201n AY Psc 01:36:55.46 +07:16:29.20 15.40 14.5 17.4 CR 14.4 CR UGZ+E High
PTFS1402x ASASSN-15bu 02:54:43.76 +22:44:02.2 17.89 17.0 19.7 CV 15.1 CV UGSU+E Medium
PTFS1504k LT Eri 04:07:14.80 -06:44:25.10 16.66 15.3 18.7 V 15.0 V UG+E Medium
PTFS1604m MASTER OT J042609.34+354144.8 04:26:09.30 +35:41:45.10 16.10 15.4 16.5 CV 12.7 CR UGSU High
PTFS1204h CSS 100218:043829+004016 04:38:29.10 +00:40:17.10 19.20 17.5 19.0 CV 16.4 CV UG+E Medium
PTFS1606dc CW Mon 06:36:54.50 +00:02:17.30 15.15 13.7 17.2 V 11.9 V UGSS High
PTFS1507o U Gem 07:55:05.30 +22:00:06.10 14.19 13.9 14.9 V 8.2 V UGSS+E High
PTFS1508bh CSS 080306:082655-000733 08:26:54.70 -00:07:33.10 19.87 16.00 20.0 CV 16.4 CV UG+E High
PTFS1509n PU UMa 09:01:03.90 +48:09:11.10 19.87 15.90 21.0 CR 15.4 CR UGSU+E High
PTFS1109e GY Cnc 09:09:50.60 +18:49:47.10 16.31 15.5 17.8 V 12.5 V UG+E Medium
AR Cnc SDSS J092207.56+310314.4 09:22:07.50 +31:03:15.10 18.70 ---- 18.7 V 15.3 V UG+EA Medium
PTFS1609t SDSS J093249.57+472523.0 09:32:49.60 +47:25:23.10 18.86 18.5 20.9 CV 14.9 CV UGSU+E Medium
PTFS1509ao SDSS J094002.56+274942.0 09:40:02.60 +27:49:42.10 18.00 15.5 18.0 CR 14.6 CR UG High
PTFS1509as DV UMa 09:46:36.70 +44:46:45.10 18.44 18.0 19.8 B 14.0 B UGSU+E Medium
PTFS1510aw SDSS J100658.40+233724.4 10:06:58.40 +23:37:24.10 18.22 16.2 20.5 CV 14.7 V UG+E Medium
PTFS1310as IY UMa 10:43:57.00 +58:07:33.10 17.32 15.0 18.9 V 13.0 V UGSU+E Medium
Observers should use the charts supplied by the PI. PDF images of
PTF (Palomar Transient Factory) close-up finder charts and two
AAVSO charts containing the targets and offset stars chosen by the
PI may be downloaded here:
(https://www.aavso.org/sites/default/files/publications_files/alerts/FindingCharts_rruizc4.pdf).
Please note that there are two versions of the finding chart for
PTFS1507o (U Gem).
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 observers are
relatively short and the target list is quite long, it is
recommended that observers coordinate their observing plans so
that all of the targets are covered on both nights if at all
possible. Please use the forum thread given above to post what
targets you plan to observe; if you see that more difficult targets
are not being covered and you can observe them, your doing so would
be greatly appreciated.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
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