[vsnet-alert 3808] on V335 Vul

[Ulisse Munari <munari@astras.pd.astro.it>]

we have been monitoring AS 356 = V335 Vul over 1999. It is one of the very
rare symbiotic stars of our Galaxy harboring a carbon giant (this is
instead the rule for symbiotic stars belonging to LMC, SMC or Draco
galaxies). Over the fall of 1999 it has been monotonically increasing in
brightness with a marked bluing of its colors (normal behavior during an
outburst of the WD companion), accompanied by a parallel reinforcement of
the emission line spectrum (which is now outstanding, while in quiescence
it was barely noticeable).

Given the steep rise in magnitude continuing over the last month, the
outburst has probably not yet reached maximum brightness. The object can
still be observed just after sunset and it will be again observable before
dawn in February next year.

An example of the recent data is the following. Note the still very red
colors of V335 Vul.

 JD=51349.92 V=12.90 B-V=+5.13
 JD=51398.85 V=11.98 B-V=+4.67
 JD=51515.55 V=11.31 B-V=+3.06

Ulisse Munari

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