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    Peculiar variation of MisV0814    

May 11, 2004
Yoshida, S.; Nakajima, K.; Kadota, K.; Ohkura, N.

We discovered a probably peculiar variable MisV0814. It was mainly constant at 13.8 mag. But Kazuhiro Nakajima detected the minute-scale rapid variation in 2004 March.

MisV0814, R.A. 05h33m33s.81, Decl. +34o43'23".7 (J2000.0), is a new variable star discovered in the course of the MISAO Project from Ken-ichi Kadota's unfiltered CCD images on Jan. 8, 2000 comparing with images on Nov. 10, 1999.

MisV0814 was found on Nobuo Ohkura's 6 unfiltered CCD images between 2000 December and 2002 January. Nakajima observed it on 37 nights between Mar. 20, 2003 and Mar. 18, 2004 with 0.25-m f/5 Schmidt-Cassegrain and CV-04 CCD.

Here is the total light curve.

Here is the light curve from 2003 March to 2004 March based on Nakajima's observations.

The light curve shows the peculiar variation of MisV0814. The large variation was detected in two short periods, between 1999 November and 2000 January, and in 2004 March. Except for those periods, it was almost constant at 13.8 mag.

Here is the light curve in 2004 March.

MisV0814 was 13.5 mag on Mar. 9. evidenly brighter than usual, but no rapid variation was detected at that time.

Minute-scale rapid variation was detected on Mar. 13 and Mar. 18.

Here is the light curve on Mar. 13, 2004.

The rapid fading was detected at the end of the observation time. It was 13.59+/-0.07 from 13:34:49 UT to 14:14:12 UT, evidenly brighter than usual. Then it began to fade rapidly as 13.97 mag at 14:15:46 UT, and 14.74 mag at 14:17:21 UT.

Here is the light curve on Mar. 18, 2004.

In general, it was evidently fainter than usual on that night. The light curve shows the peculiar rapid small variation, with two or three short outbursts of about 0.4 mag within several minutes.

There is a 6 mag star, GSC 2412-00781, 54 arcsec east of MisV0814. Our photometry could be influenced by GSC 2412-00781. But MisV0814 is probably a peculiar variable. Further observations and researches are encouraged.

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