MISAO Project

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* Profile

MisV1140 = V450 Lac

= GSC 3624-01696  22h39m58s.91 +47o20'16".2  Error:0.4"  Mag:13.04  Ma
  gError:0.38  Band:1  Class:3  Plate:00VR  Flag:F  Epoch:04 SEP 1983
= USNO-A2.0 1350.17102713  22h39m59s.066 +47o20'17".60  Mag(R):12.5  M

Digitized Sky Survey GIF image (15 x 15 arcmin)


AAVSO VSX Database

ASAS-3 Light Curve

* Discovery Information

Seiichi Yoshida, MISAO Project; Nobuo Ohkura, Okayama, Japan; and Ken-ichi Kadota, MISAO Project, discovered a new variable star MisV1140.

It was picked up by Seiichi Yoshida from the candidates of new variable stars detected by the PIXY system 2 from images taken by Nobuo Ohkura, and confirmed by Ken-ichi Kadota.

The identification is researched by Taichi Kato (Kyoto University), John Greaves (the United Kingdom), and Seiichi Yoshida.

* Special Notes

It was presumed as an eclipsing variable with large amptitude of almost 2 mag at the discovery. John Greaves commented that if MisV1140 is an Algol-like eclipsing variable, the primary may be an A star and the secondary may be a K star, for the large amplitude.

Hitoshi Yamaoka pointed out the possible identification with an eclipsing variable GH Lac. The position of GH Lac is revised in IBVS 4906, identified with a star 3.2 arcmin from the position in the GCVS 4.1. But no basis is described in the paper. MisV1140 is 7 arcmin from the position in the GCVS 4.1.

GH Lac was observed at Brno Observatory based on IBVS 4906 and the eclipsing variation was confirmed (IBVS 5263). Miloslav Zejda and Ondrej Pejcha measured MisV1140's brightness on those GH Lac images, and confirmed the variation of 1.1 mag. So MisV1140 and GH Lac are confirmed to be different objects.

John Greaves pointed out that USNO-B1.0 B1-R1 value is 1.7 mag, so B-V may be around 0.8 - 0.9 mag. He also pointed out that it is within a dark cloud IREC 130 (diameter 106') and reddened about 0.16 mag.

Kazuhiro Nakajima's observations revealed it is an Algol-type (EA) eclipsing variable with unfiltered CCD variations of 13.50 mag at maximum, 14.8 mag at primary minimum, 13.68 mag at secondary minimum, and period of 4.4479 days (IBVS 5600).

* Research and Publication

* Light Curve

MisV1140 is an Algol-type eclipsing variable
Nakajima, K.; Yoshida, S.; Ohkura, N.

* Observations by MISAO Project

1999 Aug. 21.7584413.4CKen-ichi Kadota
1999 Aug. 21.7588713.4CKen-ichi Kadota
2000 Aug. 4.6111513.3CNobuo Ohkura
2000 Aug. 4.6130013.2CNobuo Ohkura
2000 Aug. 4.6148513.2CNobuo Ohkura
2000 Sept. 17.5385413.1CNobuo Ohkura
2000 Sept. 17.5403913.2CNobuo Ohkura
2000 Oct. 10.5060815.1CNobuo Ohkura
2000 Oct. 10.5079315.2CNobuo Ohkura
2001 Oct. 12.5115913.4CNobuo Ohkura
2001 Oct. 12.5135513.4CNobuo Ohkura

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