(cba:news) Fwd: (cba:chat) V418 Ser, a new ultra-short period DNe? AM CVn type?

Joe Patterson jop at astro.columbia.edu
Fri May 23 05:44:27 EDT 2014


GREAT target for follow-up tonight, and likely all subsequent nights 
during the outburst!

joe


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CRTS detected this object in outburst on May 21 at 15.6 mag (link to the 
CRTS light curve below)

  http://nesssi.cacr.caltech.edu/catalina/20010321/103211010824100533p.html

No much seems to be known about this object (type UG in VSX; no clue 
about its periodicities). From the CRTS light curve, outbursts
are not infrequent.

  I've been with this target tonight and the light curve shows a 64-min 
signal (light curve attached). An ultra-short period DNe?
An AM CVn-type star? From inspection of the light curve in Rykoff et al. 
(2004)  IBVS 5559, this eruption is probably fresh
and may last another 7-10 days

Enrique


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