[vsnet-alert 433] attention to the fading of FN Sgr

[Taichi Kato <tkato>]

Dear colleagues,

    The symbiotic variable FN Sgr is showing a dramatical fading from
an outburst (cf. AAVSO NEWS FLASH Nos. 27, 29).  Available observations
from postings:

    1996 Apr.  2.810  11.9  Has.VSOLJ (N. Hasegawa)
               3.786  11.8  Has.VSOLJ
              11.736  12.0  Has.VSOLJ
              18.3    11.8  BRJ (J. Bortle *1)
              21.0    12.0  OB (D. Overbeek *1)
              22.0    12.0  OB
              23.0    12.0  OB
              24.383  12.1  MRV (R. Medic *1)
              27.0    12.0  OB
              28.0    12.0  OB
         May  14.9    11.9  MLF (B. Monard)
              24.407  13.1  SQN (L. Shaw)
              30.101 <13.0  OB
              30.204  13.8  BRJ
              31.162 <13.0  OB
         Jun.  5.656  13.7  Has.VSOLJ
               6.163  14.5  BRJ

  (*1 from issues of AAVSO NEWS FLASH)

     The object stayed at mv~11.8 since last September (vsnet-alert 236,
J. Bortle; vsnet-obs 1188, M. Moriyama; vsnet-obs 1273, S. Kiyota;
vsnet-alert 249, J. Bortle).

     The current rapid fading may represent an eclipse of the outbursting
component by the red giant secondary star, a phenomenon which was most
dramatically observed during the latest outbursts of AX Per, V1413 Aql
(=AS 338) and FG Ser(=AS 296).  Although I am not aware of any orbital
ephemeris of this symbiotic binary (does anyone know?), I would like urge
observers to closely monitor the object to see if any egress may occur
in a month or so.  Since evolvement of the eclipse in AX Per was quite
rapid, nightly observations would help.

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp