[vsnet-chat 2378] MisV0297, near by nova in 1960

[Seiichi Yoshida <seiichi@muraoka.info.waseda.ac.jp>]

Dear colleagues,

I am Seiichi Yoshida, working on the MISAO Project.

We discovered a new variable star near by DZ Ser, a nova in 1960. The
position of the nova is uncertain. So maybe our variable star and DZ
Ser are the same object.

The star is named MisV0297. It is at R.A.=18h00m53s.02, Decl.=
-10o32'36".0 (2000.0) and identified with USNO-A2.0 0750.12507224 and 
IRAS 17581-1032 (note the R.A. and Decl. is that recorded in the
USNO-A2.0 catalog, not measured data by us).

  USNO-A2.0_0750.12507224  18 00 53.022  -10 32 36.04  14.7R  18.3B
  IRAS 17581-1032  R.A.=18 00 52.76  Decl.=-10 32 37.2  (42 x 7", p.a.=88)  flux(12)=1.51  flux(25)=0.88  flux(60)=<0.49  flux(100)=<4.40  35% variable

It was detected by the PIXY system as one of the candidates of new
variable stars from unfiltered CCD survey images taken by KenIchi
Kadota, Ageo City, Saitama, Japan, with 0.16-m f/3.3 reflector, then
confirmed by Seiichi Yoshida as a real new variable star. It was 14.5
mag on Apr. 8.73, 14.0 mag on Apr. 30.76, 12.3 mag on Aug. 1.57, and
12.8 mag on Aug. 31.55 (UT). The magnitude is based on a preliminary V
magnitude calculated from R and B magnitude in the USNO-A1.0 based on
Taichi Kato's equation:
  V = R + 0.375 (B - R)

DZ Ser, a nova in 1960, is near by MisV0297. Taichi Kato researched
some papers and pointed out that the position of DZ Ser is uncertain
as follows.

  Duerbeck             175812.72 -103350.35 (1950.0)
  Wyckoff and Wehinger 175812.8  -103400.5  (1950.0)

The difference is 8 arcsec. MisV0297 is farther than 110 arcsec from
both positions above. Therefore, probably MisV0297 is another new
variable star just near by DZ Ser. However, the discovery of DZ Ser
was only based on the spectral photograph and it was very faint (14
mag). Is there any possibility that MisV0297 and DZ Ser are the same
object?

The finding chart is available at:

  http://vsnet.info.waseda.ac.jp/muraoka/members/seiichi/misao/data/MisV/MisV0297.gif

Please see the URL below for the MISAO Project and the PIXY system.

  http://vsnet.info.waseda.ac.jp/muraoka/members/seiichi/misao/

Best regards,

--
Seiichi Yoshida
seiichi@muraoka.info.waseda.ac.jp
http://vsnet.info.waseda.ac.jp/muraoka/members/seiichi/index.html

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