[vsnet-j 1037] WR104 = HadV82

[Taichi Kato <tkato>]

WR104 = HadV82

　この天体、Keck望遠鏡で「星のまわりのうずまきが回転している」様子が撮影
　されて一躍有名になった天体でした。

  たとえば http://vsnet.isi.ssl.berkeley.edu/wr104.html

　以下のニュースを出しました。

       *************************************************************
          Amateur Discovery of Remarkable Optical Variability of
                   a Dusty Wolf-Rayet star, WR 104
       *************************************************************

   Katsumi Haseda (Aichi, Japan; the discoverer of Nova Sct 2000 = V463 Sct)
reports the discovery of a new variable star (HadV82).  The star is
identified with an IR-luminous WR-type star, WR104 = Ve2-45.  Striking
spectroscopic variability WR104, probably associated with photometric fading,
was previously reported by Crowther, MNRAS 290, L59 (1997).  The suggested
photometric fading by Crowther (1997) was based on a comparison with
previously published photometry, and was not very conclusive.  Crowther (1997)
also added that past research had found no infrared variability.  Crowther
(1997) suggested this phenomenon to be dust condensation as seen in R CrB-type
stars, but the nature of variation remained an mystery.  The present
discovery by Haseda has not only shown that the object is indeed variable
in optical, but also that bright and faint states appear interchangebly,
with a characateris time scale of one to a few years.  Since the object is
in bright state now, further observations are strongly encouraged.

   WR 104 is surrounded by a nebula, see also Tuthill et al. 1999, Nature
398, 487: "A dusty pinwheel nebula around the massive star WR 104".
(other on-line information can be read at several internet site, e.g.
http://vsnet.isi.ssl.berkeley.edu/wr104.html)

   WR 104 = Ve2-45 = HadV82 is located at 18h 02m 04s.17, -23o 37' 42".3
           (J2000.0).

Regards,
Taichi Kato
On behalf of the VSNET Collaboration team

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