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[vsnet-campaign 868] New Haseda variable (HadV82) = WR104, updated data
- Date: Mon, 23 Apr 2001 10:11:49 +0900 (JST)
- To: vsnet-alert, vsnet-campaign, vsnet-sdor
- From: Taichi Kato <tkato>
- Subject: [vsnet-campaign 868] New Haseda variable (HadV82) = WR104, updated data
- Sender: owner-vsnet-campaign@kusastro.kyoto-u.ac.jp
New Haseda variable (HadV82) = WR104, updated data
> 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
Haseda further provides the following updated set of photographic
photometry, based on the detailed chart prepared by T. Watanabe.
The former set of observations should be completely superseded.
The resultant data show very large light variations, characterized by
deep fadings. The exact values may be still subject to a small change,
pending accurate field photometry.
HadV82 = WR104 WR 11.8-(14.5p
Photographic magnitude estimates by VSOLJ members
object YYYYMMDD(UT) mag code
WR104 19960525.667 142p Had.VSOLJ
WR104 19970309.813 <145p Had.VSOLJ
WR104 19970416.824 <135p Had.VSOLJ
WR104 19970517.724 135p Had.VSOLJ
WR104 19970606.665 127p Had.VSOLJ
WR104 19980228.825 120p Had.VSOLJ
WR104 19980302.825 120p Had.VSOLJ
WR104 19980328.811 <135p Had.VSOLJ
WR104 19980402.798 138p Had.VSOLJ
WR104 19980425.712 138p Had.VSOLJ
WR104 19980429.715 139p Had.VSOLJ
WR104 19980522.681 138p Had.VSOLJ
WR104 19980629.626 135p Had.VSOLJ
WR104 19981009.426 119p Had.VSOLJ
WR104 19990219.832 118p Had.VSOLJ
WR104 19990323.780 119p Had.VSOLJ
WR104 19990323.780 127p Had.VSOLJ
WR104 19990803.530 138p Had.VSOLJ
WR104 20000212.836 119p Had.VSOLJ
WR104 20000305.799 138p Had.VSOLJ
WR104 20000428.736 142p Had.VSOLJ
WR104 20000601.608 <135p Had.VSOLJ
WR104 20000716.597 <142p Had.VSOLJ
WR104 20000721.560 <139p Had.VSOLJ
WR104 20000802.515 138p Had.VSOLJ
WR104 20000822.510 135p Had.VSOLJ
WR104 20010202.860 120p Had.VSOLJ
WR104 20010226.811 118p Had.VSOLJ
WR104 20010326.867 124p Had.VSOLJ
WR104 20010331.794 120p Had.VSOLJ
Observer's code:
Had: K. Haseda (Aichi, Japan)
Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)
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