[vsnet-alert 277] HT Cas: eclipses observed at Ouda

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

Dear Colleagues,

    A total of high quality 1081 V-band CCD frames of HT Cas were obtained
by a 60-cm reflector at Ouda Station (Kyoto University) with a typical time
resolution of 23s (20s exposure + 3s dead time).  A prelimary analysis
gives following mid-eclipse times (heliocentric correction has not been
applied intentionally).  Magnitudes were determined using V=11.88 star
by Misselt (1995).

    JD (Geo)    eclipse center   outside eclipse   depth
 2450039.86757      14.45 V          13.16 V        1.29 V
      40.01482      14.45            13.17          1.28
      40.08851      14.50            13.22          1.28
      40.16218      14.57            13.26          1.31
      40.23583      14.72            13.29          1.43

   Eclipses last ~12 min.  The above data seem to indicate HT Cas has already
started a rather rapid decline at a rate of ~0.5 mag/day.  However, broad hump
features (amplitude ~0.05 mag) around 2450040.108 and 2450040.190 may be
indicative of the appearance of superhumps.  Further observations are
strongly encouraged.

Regards,
Ouda team (Daisaku Nogami and Hajime Baba observing)

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