[vsnet-alert 840] V1413 Aql (=AS 338)

[Taichi Kato <tkato>]

   The eclipsing symbiotic nova V1413 Aql = AS 338 is undergoing a sudden
drop in magnitude as indicated by the following observations.

  YYMMDD(UT)   mag  code
  970301.205   121  POY
  970320.160   122  POY
  970327.106   122  POY
  970329.105   122  POY
  970401.167   123  POY
  970410.133   138  POY

   The outburst and eclipsing nature of this object was discovered by
M. Wakuda (VSOLJ Variable Star Bulletin 5, 17, 1988), who gave the following
eclipse ephemeris:

   Min = JD 2445784 + 434 E

   The system was further studied by U. Munari (Astron. Astrophys. 257,
163, 1992) who gave an improved ephemeris:

   Min = JD 2446650 + 434.1 E
              +/-15  +/-0.2

   Munari concluded from optical and UV spectroscopy and photometry that
the object, composed by an M5 III star and a very hot compact star,
presumably resulting a symbiotic nova-type thermonuclear runaway (TNR)
without a detectable mass ejection.  Observations during the present
eclipse are highly encouraged since the object is currently experiencing
strong multiple reflares starting in 1992 (the largest one in 1995).

   Reported observations show a considerable scatter.  The V-band VSNET
chart dated 1996 Sep. 9 would solve the problem in comparison stars.

Regards,
Taichi Kato

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