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"The best observing practice is to adopt a star and stick to it - *density of observation* is very critical.  Until you don't like it any more - then adopt a different star!" --Joe Patterson (Columbia University, CBA boss)

Our first observing priority are accreting white dwarfs which have been observed to host classical nova explosions. As Joe Patterson said on 2016 Apr 25, A word about this project - the long-term "old nova project". We'd like to track the evolution of nova orbital light curves, over the first few decades after outburst. The most interesting interval is the first few years, so even very recent novae (say 1-3 years) are eligible. Most novae flash orbital light curves, and most show a very characteristic light curve, suggesting heating of the secondary - a double-sinusoid with an apparent eclipse. In theory, the evolution of the "eclipse" and the double wave allows deduction of the changing pattern of heating in the binary... and that might even allow us to track the cooling of the white dwarf, decades after eruption.

Last updated by Laura Chomiuk on 2017 July 12.

Stars Edit

Nova ASASSN-17hx: RA=18:31:45.918, Dec=-14:18:55.57 Edit

  • Finder chart
  • Please get nice B, V, R, I exposures (say, just three exposures in each filter) every night you observe. You don't need to sit on this one for monitoring sequences.
  • Comparison Star: 127
  • Check Star 1: 134
  • Check Star 2: 120
  • Don't need to submit to CBA; these are for Laura! Send to chomiuk-AT-pa.msu.edu instead

V1974 Cyg: 20:30:31.61, +52:37:51.3 Edit

  • Finder chart
  • Use comparison stars 139, 142, 146
  • Filter to use: Clear

OV Boo: 15:07:22.35, +52:30:39.8 Edit

Intermediate Polars Edit

V2069 Cyg: 21 23 44.83 +42 18 01.6 Edit

Mystery Stars Edit

FS Aur: 05:47:48.36, +28:35:11.2 Edit

Paloma=RX J0524+4244: 05:24:30.44, +42:44:50.8 Edit

Retired (at least presently): Edit

DW Cnc: 07:58:53.07, +16:16:45.4

  • Finder chart
  • More info on Koji's intermediate polar (IP) page
  • 1.4 hour orbital period; 39 minute white dwarf spin period.
  • "DQ Her"-like, or an intermediate polar. So the white dwarf has a pretty strong magnetic field.
  • Should be in the range 15--17.5 mag. So either V band or clear monitoring may work; if you have opinions on which is better, report back!

YZ CNC: 08:10:56.65, +28:08:33.2

  • Finder chart
  • Variable Type: SU UMa type dwarf nova
  • Campaign Timeframe: ongoing
  • Filter to use: V
  • Exposure Length: not specified
  • Orbital Period: 2.08 hours
  • Outburst Period: 7-10 days
  • Superoutburst Period: 100-110 days
  • Quiescence Magnitude: 14.8
  • Outburst Max Magnitude: 12.0
  • Superoutburst Max Magnitude: 11.0

AM CVn: 12:34:54.62, +37:37:44.1 --- retired as of Summer 2017

CR Boo: 13:48:55.22, +07:57:35.8

  • Variable Type: AM CVn type dwarf nova
  • Campaign Timeframe: ongoing
  • Filter to use: Clear
  • Exposure Length: not specified
  • Quiescence Magnitude: ~15.0
  • Is too low for the telescope at ~2:30 AM

ES Dra: 15:25:31.81, +62:01:00.0

  • Variable Type: Z Cam dwarf nova
  • Campaign Timeframe: ongoing
  • Filter to use: V (Clear if too dim)
  • Exposure Length: not specified
  • Period: 4.2 hours
  • Quiescence Magnitude: 15.4
  • Negative Superhump Magnitude: 17.0
  • Finder chart

IGR J19552+0044: 19 55 12.47 +00 45 36.6

  • Finder chart
  • Short exposures (as short as possible!)
  • Comparison Stars: 148, 145, 158

V2306 Cyg: 19 58 14.46 +32 32 42.4

V598 Peg = RX233325.92+152222: 23:33:25.99, +15:22:22.2




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