[vsnet-newvar 1043] Dramatic fading: New Haseda variable (HadV98)

[Taichi Kato <tkato>]

Dramatic fading: New Haseda variable (HadV98)

   Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable
star (HadV98).  The variable had been almost constant for years, and
suddenly faded!  This star may be a new R CrB star or a long-period
eclipsing binary (or something else?).  The lack of IRAS detection may
be against the R CrB-type interpretation, but has been a result of
source confusion.  More observations, spectrscopic classification and
a search for past photographs, are urgently requested.

HadV98
= GSC6825.253 172314.54 -225204.4 (2000.0) 10.70 6 N
= GSC6825.253 172314.56 -225205.5 (2000.0) 10.72 6
= USNO0600.13841424 172314.559 -225205.28 (2000.0) 10.6 12.6
= 172314.5 -225205 (2000.0) 1092 0.97 TYC2-6825.253.1 (11.03 0.09) (12.16 0.19)
= 172314.7 -225150 (2000.0) CD-22.12017 9.7

  HadV97  RCB?/E?  10.6-(12.8p

Photographic magnitude estimates by VSOLJ members

object         YYYYMMDD(UT)   mag  code
HadV98         19970724.515  106p  Had.VSOLJ
HadV98         19970823.500  106p  Had.VSOLJ
HadV98         19980330.774  106p  Had.VSOLJ
HadV98         19990115.852  106p  Had.VSOLJ
HadV98         19990216.830  107p  Had.VSOLJ
HadV98         19990323.776  107p  Had.VSOLJ
HadV98         19990803.539  106p  Had.VSOLJ
HadV98         19990830.474  106p  Had.VSOLJ
HadV98         20000206.829  106p  Had.VSOLJ
HadV98         20000429.724  106p  Had.VSOLJ
HadV98         20000604.599  106p  Had.VSOLJ
HadV98         20000708.590  106p  Had.VSOLJ
HadV98         20000802.508  107p  Had.VSOLJ
HadV98         20000822.495  106p  Had.VSOLJ
HadV98         20000924.477  107p  Had.VSOLJ
HadV98         20010202.856  106p  Had.VSOLJ
HadV98         20010226.807  107p  Had.VSOLJ
HadV98         20010304.806  107p  Had.VSOLJ
HadV98         20010319.782  106p  Had.VSOLJ
HadV98         20010321.782  107p  Had.VSOLJ
HadV98         20010331.790  106p  Had.VSOLJ
HadV98         20010422.759  107p  Had.VSOLJ
HadV98         20010512.583  125p  Had.VSOLJ
HadV98         20010517.639  125p  Had.VSOLJ
HadV98         20010528.620  <128p  Had.VSOLJ
HadV98         20010615.672  <128p  Had.VSOLJ
HadV98         20010626.619  <128p  Had.VSOLJ
HadV98         20010713.572  <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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