VSNET Home Page
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)
VSNET Home Page 
VSNET Home Page 
Return to Daisaku Nogami