[vsnet-campaign-be 116] New Haseda variable (HadV84) = WR106

[Taichi Kato <tkato>]

New Haseda variable (HadV84) = WR106

   Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable
star (HadV84).  The object is indentified with a dusty WC9 star, WR 106,
which is similar to WR 104 = HadV82, the "pinwheel star".  The present
discovery is remarkable in that Haseda detected temporary fadings with
depths more than 2 magnitudes in two dusty WC9 stars.  These observations
may suggest a new class of WR-type variable stars.  Since the light variation
may suggest that WR 106 = HadV84 is a twin od WR 104  = HadV82, a vigirous
search for binarity, and the evidence of the "chimney mechanism" proposed
for WR 104 is strongly encouraged.  Infrared interferometric observations
as in WR 104 would be helpful in elucidating the peculiar characteristics.
More detailed studies are in progress, in cooperation with the VSOLJ
(Variable Star Observers League in Japan) members.  Later studies on old
literatures have proven that the object is identical with NSV10152,
which was suspected of variability based on a small discrepancy between
existing photoelectric records (M. P. FitzGerald, A&AS 9, 297), but the
evidence for variability was very sparce, nor any indication of such a large
variation was found in literatures.  We therefore call the variable as
HadV84 = WR106 (=NSV10152), in order to memorize Haseda's feat of discovering
such striking variability of an unusual star.

HadV84
= GSC6263.1874 180443.63 -210930.4 (2000.0) 11.54 6
= GSC6263.1874 180443.67 -210930.6 (2000.0) 11.88 6
= USNO0675.15146329 180443.650 -210930.57 (2000.0) 11.7 99.9
= 180443.5 -210929 (2000.0) WR106 12.36 WC9 IC14-8
= 180444.2 -210930 (2000.0) IRAS18017-2109 11.670 3.762 11.690 402.300L 4%
= 180444.2 -210930 (2000.0) SSC18017-2109 11.670 3.762 11.690 402.300L
= 180443.4 -210949 (2000.0) LSS4628 12.8p WRH 
= 180443.5 -210951 (2000.0) UBV_LSS4628 11.93 1.22 0.30 .061 .023 .005 WC N=2 Nm4 -
= 180447.5 -210945 (2000.0) 313643

  HadV84 = WR106  WR  11.3-(13.2p

Photographic magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV84         19960525.667  114p  Had.VSOLJ
HadV84         19970309.813  118p  Had.VSOLJ
HadV84         19970416.783  114p  Had.VSOLJ
HadV84         19970509.717  115p  Had.VSOLJ
HadV84         19970517.724  114p  Had.VSOLJ
HadV84         19970606.665  113p  Had.VSOLJ
HadV84         19980228.825  114p  Had.VSOLJ
HadV84         19980302.825  119p  Had.VSOLJ
HadV84         19980307.799  120p  Had.VSOLJ
HadV84         19980328.811  120p  Had.VSOLJ
HadV84         19980402.798  122p  Had.VSOLJ
HadV84         19980425.712  114p  Had.VSOLJ
HadV84         19980429.715  122p  Had.VSOLJ
HadV84         19980522.681  119p  Had.VSOLJ
HadV84         19980629.626  114p  Had.VSOLJ
HadV84         19981009.426  114p  Had.VSOLJ
HadV84         19990219.832  114p  Had.VSOLJ
HadV84         19990323.780  116p  Had.VSOLJ
HadV84         20000206.837  130p  Had.VSOLJ
HadV84         20000212.836  132p  Had.VSOLJ
HadV84         20000305.841  <130p  Had.VSOLJ
HadV84         20000428.733  <132p  Had.VSOLJ
HadV84         20000601.608  120p  Had.VSOLJ
HadV84         20000716.597  115p  Had.VSOLJ
HadV84         20000721.560  120p  Had.VSOLJ
HadV84         20000802.515  114p  Had.VSOLJ
HadV84         20000822.510  114p  Had.VSOLJ
HadV84         20010202.860  117p  Had.VSOLJ
HadV84         20010226.809  114p  Had.VSOLJ
HadV84         20010319.788  119p  Had.VSOLJ
HadV84         20010326.786  121p  Had.VSOLJ
HadV84         20010331.795  117p  Had.VSOLJ
HadV84         20010422.763  117p  Had.VSOLJ

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

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