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[vsolj-alert 356] FN Sgr fading



FN Sgr fading

 1996年来アウトバーストして話題となっている共生星FN Sgrが急激に減光したこと
 が報告されています。1996年にも同様の現象があり、深い食によるものの可能性が
 濃厚です。アウトバースト中に顕著な食の見られる共生星としてCI Cyg, AX Per等
 が有名ですが、系のパラメータを決めるために食の観測が極めて重要です。食は1
 ヶ月強続くと思われ、条件的にも恵まれていますのでぜひ観測してみてください。

Sudden fading of FN Sgr

  L. E. Shaw reports the sudden fading of FN Sgr, symbiotic variable currently
undergoing an outburst.  A similar sharp drop was observed in 1996, centering
1996 June.  There was also an indication of fading in 1997 Dec. - 1998 Jan.
(coverage incomplete due to the seasonal gap).  cf. vsnet-alert 433, 528

  The present observation likely indicate the existence of deep eclipses,
with a period of ~540 d.  Observations are strongly encouraged.

  YYMMDD(UT)   mag  observer
  990225.100   116  (B. Monard)
  990308.099   116  (D. Overbeek)
  990309.058   116  (D. Overbeek)
  990316.103   122  (D. Overbeek)
  990317.100   118  (D. Overbeek)
  990326.100   117  (B. Monard)
  990413.000   117  (B. Monard)
  990424.000   118  (B. Monard)
  990424.369   121  (R. J. Modic)
  990429.760  12.41B  (S. Kiyota)
  990429.764  12.07V  (S. Kiyota)
  990429.767  11.38Rc  (S. Kiyota)
  990510.000   118  (B. Monard)
  990514.699   118  (T. Watanabe)
  990606.378   146: (L. E. Shaw)

Regards,
Taichi Kato

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