[vsnet-alert 52] preliminary analysis of DV UMa eclipses

[tkato@kusastro.kyoto-u.ac.jp]

Dear vsnet-alert members,

    As D. Nogami has already announced, the Ouda team successfully obtained
V-band photometry of four consecutive eclipses of just-below-the-gap dwarf
nova, DV UMa, which is currently undergoing a long-awaited outburst.

    A preliminary analysis of the eclipse light curves has yielded
following mid-eclipse times and eclipse depths.  Due to the asymmetry
of the eclipse light curves, these values would have a certain offset
from the mid-eclipse times of the white dwarf.

  mid-eclipse (JD-Geo)   depth(V)

      2449775.9651         1.6
          776.0509         1.7
          776.1365         1.9
          776.2224         2.0

    It is interesting to note that the period obtained from these eclipse
times (0.08575 +/- 0.00005 day; the error includes the internal error only)
is significantly different from Porb (0.08597 day).

    It is also interesting to note that the eclipse depth is indeed
increasing.  Has the disk already started shrinking?  The superhumps had
not been grown yet (less than 0.1 mag in amplitude) at the time of our
observation.

Regards,
Taichi Kato

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