[vsnet-preprint 101] DM Lyr paper

[Daisaku NOGAMI <nogami@kwasan.kyoto-u.ac.jp>]

Dear colleagues,

We wish all VSNET members a happy and fruitful new year.

Our paper regarding DM Lyr was accepted for publication in
PASJ.  The abstract is attached below.  The PDF file is
available in the VSNET preprint archive:

http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/DM_Lyr/

Best regards,
Daisaku Nogami
--------------------------------------------------------

Title: The SU UMa Nature of the Dwarf Nova, DM Lyrae
Author: D. Nogami, H. Baba, K. Matsumoto, T. Kato
Abstract:
 We carried out time-resolved $V$-band photometry of DM Lyr during long
 outbursts in 1996 July and in 1996 February-March at Ouda Station, Kyoto
 University and at Osaka Kyoiku University.  Since superhumps were
 clearly detected in the light curves, DM Lyr was first identified with
 an SU UMa-type dwarf nova.  The superhump period is 0.0673(2) d, and
 the superhump excess is 2.8(3) \%.  The duration of the superoutburst,
 the outburst amplitude, the decline rate in the plateau phase, and the
 superhump excess were typical values for a usual SU UMa star.
 According to visual and CCD observations reported to VSNET, this star
 has experienced a dramatic change of the outburst pattern from a
 superoutburst phase to a normal outburst phase.  There may exist
 mechanisms to decrease the number of the normal outburst between two
 successive superoutbursts and to elongate the recurrence cycle of the
 superoutburst.

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