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[vsnet-obs 19987] New Takamizawa variable (TmzV312)

New Takamizawa variable (TmzV312)

   Kesao Takamizawa (Nagano, Japan) reports the discovery of a new variable
star (TmzV312).

TmzV312
= GSC5990.1259 075506.34 -190923.6 (2000.0) 13.93 0
= GSC5990.1259 075506.36 -190923.4 (2000.0) 13.82 0
= USNO0675.05361243 075506.383 -190923.76 (2000.0) 11.0 14.1
= IRAS07528-1901 075253.0 -190124 (1950.0)
    F12=1.10  F25=0.48  F60=0.40L F100=3.98L
    VAR= 3 LRS=-1
 possibly II: variable star with 'young' O-rich circumstellar shell
 or VII: variable star with more evolved C-rich circumstellar shell
 or VIa: non-variable star with relatively cold dust at large
      distance, may be carbon-rich
= 075506.3 -190922 (2000.0) IRAS07528-1901 1.127 0.497 0.400L 3.889L 3%
= 075506.3 -190922 (2000.0) SSC07528-1901 1.127 0.497 0.400L 3.889L

  Takamizawa's comment:

  The star may be a semiregular variable with a range of 12.8-14.4p.

Photographic magnitude estimates by VSOLJ members

object         YYMMDD(UT)   mag  code
TmzV312        940314.505  126p  Tmz.VSOLJ
TmzV312        941111.738  129p  Tmz.VSOLJ
TmzV312        950203.546  129p  Tmz.VSOLJ
TmzV312        950927.799  144p  Tmz.VSOLJ
TmzV312        951118.744  131p  Tmz.VSOLJ
TmzV312        951222.685  139p  Tmz.VSOLJ
TmzV312        960211.515  137p  Tmz.VSOLJ
TmzV312        961021.776  131p  Tmz.VSOLJ
TmzV312        970103.622  128p  Tmz.VSOLJ
TmzV312        970227.485  136p  Tmz.VSOLJ
TmzV312        971013.791  131p  Tmz.VSOLJ
TmzV312        971103.802  129p  Tmz.VSOLJ
TmzV312        971204.703  131p  Tmz.VSOLJ
TmzV312        971224.641  130p  Tmz.VSOLJ
TmzV312        980121.556  130p  Tmz.VSOLJ
TmzV312        980217.505  131p  Tmz.VSOLJ
TmzV312        981115.744  126p  Tmz.VSOLJ
TmzV312        981212.628  128p  Tmz.VSOLJ
TmzV312        990208.557  130p  Tmz.VSOLJ

Observer's code:
  Tmz: K.Takamizawa (Saku-machi,Nagano,Japan)
       Inst.: 10cmR F4 twin patrol cameras  T-Max400 120
       Comparison stars mag.:GSC

Relayed from Kesao Takamizawa <GHA07243@nifty.ne.jp>

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