[vsnet-newvar 826] New Haseda variable (HadV82) = WR104

[Taichi Kato <tkato>]

New Haseda variable (HadV82) = WR104

   Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable
star (HadV82).  The star is identified with an IR-luminous WR-type star,
WR104 = Ve2-45.  The 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.

HadV82
= USNO0600.14942653 180204.174 -233742.27 (2000.0) 12.4 15.6
= 2MASS 180204.136 -233741.91 (2000.0)  6.681  0.000  0.000
= 2MASS 180204.368 -233739.00 (2000.0)  0.000  0.000  0.000
= IRAS17590-2337 175901.1 -233746 (1950.0)
    F12=398.04  F25=144.51  F60=36.30L F100=331.08L
    VAR=16 LRS=-1
 possibly II: variable star with 'young' O-rich circumstellar shell
 or VII: variable star with more evolved C-rich circumstellar shell
= 180204.9 -233741 (2000.0) ASAS_J180205-2337.7 10.11I (0.46) 
= 180203.9 -233733 (2000.0) RAFGL2048
= 180203.9 -233733 (2000.0) TMSS-20417
= 180204.0 -233741 (2000.0) WR104 13.54 WC9 Ve2-45
= 180204.0 -233743 (2000.0) IRAS17590-2337 411.500 140.200 37.590L 332.700L 16%
= 180204.0 -233743 (2000.0) SSC17590-2337 411.500 140.200 37.590L 332.700L

  HadV82 = WR104  WR  12.6-(12.8p

Photographic magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV82         19960525.667  <128p  Had.VSOLJ
HadV82         19970309.813  <128p  Had.VSOLJ
HadV82         19970416.824  <128p  Had.VSOLJ
HadV82         19970517.724  <128p  Had.VSOLJ
HadV82         19970606.665  128p  Had.VSOLJ
HadV82         19980228.825  127p  Had.VSOLJ
HadV82         19980302.825  126p  Had.VSOLJ
HadV82         19980307.799  126p  Had.VSOLJ
HadV82         19980328.811  <128  Had.VSOLJ
HadV82         19980402.798  <128p  Had.VSOLJ
HadV82         19980425.712  <128p  Had.VSOLJ
HadV82         19980429.715  <128p  Had.VSOLJ
HadV82         19980629.626  128p  Had.VSOLJ
HadV82         19981009.426  126p  Had.VSOLJ
HadV82         19990219.832  126p  Had.VSOLJ
HadV82         19990323.780  127p  Had.VSOLJ
HadV82         19990803.530  128p  Had.VSOLJ
HadV82         20000206.837  127p  Had.VSOLJ
HadV82         20000212.836  128p  Had.VSOLJ
HadV82         20000305.799  <128p  Had.VSOLJ
HadV82         20000428.736  <128p  Had.VSOLJ
HadV82         20000601.608  <128p  Had.VSOLJ
HadV82         20000708.594  <128p  Had.VSOLJ
HadV82         20000716.597  <128p  Had.VSOLJ
HadV82         20000721.560  <128p  Had.VSOLJ
HadV82         20000802.515  <128p  Had.VSOLJ
HadV82         20000822.510  <128p  Had.VSOLJ
HadV82         20010202.860  127p  Had.VSOLJ
HadV82         20010226.811  127p  Had.VSOLJ
HadV82         20010326.867  126p  Had.VSOLJ
HadV82         20010331.794  128p  Had.VSOLJ

Observer's code:
  Had: K. Haseda (Aichi, Japan)
       Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)

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