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[vsnet-campaign 226] V493 Lyr CCD photometry - what to think ?
Dear colleagues,
I already reported CCD photometry on the present outburst of V493 Lyr, through VSNET-CAMPAIGN 193. Basically, the light curve during that run was very flat, showing no obvious signals.
I obtained further CCD photometry on 2000, Jun 12/13, using the 0.35-m f/6.3 telescope of CBA Belgium Observatory and an unfiltered ST-7 CCD. This time, the resulting light curve is showing some modulation, although I wouldn't attribute it to superhumps. For your convenience, the results are attached to this email.
To me, it seems V493 Lyr indeed is a long-period UGSS-type dwarf nova, as also suggested by Taichi Kato, in VSNET-CAMPAIGN 194. When discussing the Jun 12/13 lightcurve with Taichi, he remarked that it is his impression that UGSS stars with a slow rise tend to show short-term variation. The reason why is unclear. But V493 Lyr might be a good example.
I would appreciate any comments from vsnet readers on this subject !
Best regards,
Tonny Vanmunster
CBA Belgium Observatory
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PHOTOMETRIC CCD OBSERVATIONS OF V493 Lyr
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CENTER FOR BACKYARD ASTROPHYSICS (CBA) BELGIUM
Observer : Tonny Vanmunster, Landen, Belgium
Internet: Tonny.Vanmunster@advalvas.be
Instruments: 0.35-m f/6.3 SCT , ST-7 SBIG CCD
unfiltered exposures
Differential magnitudes
------------------------------------------------------
Observations for June 12/13, 2000 [clear night; moonlight; short run to check for superhumps]
Exposure duration : 80s
COMP1 = GSC 3128 487 mag 12.6 approx. 2' ENE of variable
COMP2 = GSC 3128 357 mag 13.0 approx. 2' E of variable
MID-INT. V C1 C2 V-C1 V-C2
TIME (JD)
1708.4211 -10.53 -12.21 -11.64 1.68 1.11
1708.4221 -10.58 -12.26 -11.69 1.68 1.11
1708.4232 -10.56 -12.26 -11.65 1.70 1.09
1708.4243 -10.54 -12.24 -11.66 1.70 1.12
1708.4254 -10.56 -12.25 -11.67 1.69 1.11
1708.4264 -10.52 -12.23 -11.63 1.71 1.11
1708.4275 -10.58 -12.25 -11.69 1.67 1.11
1708.4286 -10.58 -12.26 -11.69 1.68 1.11
1708.4307 -10.60 -12.28 -11.71 1.68 1.11
1708.4318 -10.57 -12.25 -11.68 1.68 1.11
1708.4329 -10.63 -12.28 1.65
1708.4340 -10.60 -12.28 -11.71 1.68 1.11
1708.4351 -10.58 -12.24 -11.66 1.66 1.08
1708.4362 -10.57 -12.26 -11.69 1.69 1.12
1708.4373 -10.58 -12.27 -11.73 1.69 1.15
1708.4384 -10.62 -12.29 -11.71 1.67 1.09
1708.4395 -10.65 -12.32 -11.73 1.67 1.08
1708.4406 -10.54 -12.23 -11.67 1.69 1.13
1708.4416 -10.60 -12.28 -11.70 1.68 1.10
1708.4427 -10.59 -12.26 -11.71 1.67 1.12
1708.4438 -10.63 -12.29 -11.72 1.66 1.09
1708.4449 -10.66 -12.29 -11.72 1.63 1.06
1708.4460 -10.69 -12.31 -11.72 1.62 1.03
1708.4471 -10.67 -12.29 -11.73 1.62 1.06
1708.4481 -10.61 -12.25 -11.68 1.64 1.07
1708.4492 -10.59 -12.23 -11.67 1.64 1.08
1708.4503 -10.64 -12.27 -11.70 1.63 1.06
1708.4514 -10.62 -12.25 -11.68 1.63 1.06
1708.4525 -10.70 -12.32 -11.75 1.62 1.05
1708.4536 -10.68 -12.29 -11.75 1.61 1.07
1708.4546 -10.63 -12.24 -11.68 1.61 1.05
1708.4557 -10.68 -12.30 -11.71 1.62 1.03
1708.4568 -10.64 -12.28 -11.75 1.64 1.11
1708.4579 -10.60 -12.26 -11.70 1.66 1.10
1708.4590 -10.64 -12.29 -11.71 1.65 1.07
1708.4600 -10.64 -12.29 -11.73 1.65 1.09
1708.4611 -10.65 -12.29 -11.72 1.64 1.07
1708.4622 -10.64 -12.29 -11.73 1.65 1.09
1708.4633 -10.64 -12.28 -11.73 1.64 1.09
1708.4644 -10.66 -12.31 -11.74 1.65 1.08
1708.4655 -10.67 -12.33 -11.77 1.66 1.10
1708.4666 -10.65 -12.29 -11.73 1.64 1.08
1708.4676 -10.64 -12.31 -11.76 1.67 1.12
1708.4687 -10.59 -12.26 -11.70 1.67 1.11
1708.4698 -10.58 -12.26 -11.73 1.68 1.15
1708.4709 -10.64 -12.29 -11.75 1.65 1.11
1708.4720 -10.61 -12.29 -11.75 1.68 1.14
1708.4730 -10.59 -12.27 -11.74 1.68 1.15
1708.4741 -10.56 -12.23 -11.70 1.67 1.14
1708.4752 -10.63 -12.30 -11.76 1.67 1.13
1708.4763 -10.63 -12.29 -11.75 1.66 1.12
1708.4773 -10.57 -12.27 -11.73 1.70 1.16
1708.4784 -10.58 -12.24 -11.71 1.66 1.13
1708.4795 -10.56 -12.26 -11.70 1.70 1.14
1708.4808 -10.56 -12.26 -11.71 1.70 1.15
1708.4819 -10.57 -12.29 -11.75 1.72 1.18
EOF
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