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We present the first measurement of the absolute proper motions of IRAS00259+5625 (CB3, LBN594) associated with the HI loop called the "NGC281superbubble" that extends from the Galactic plane over ~300 pc towarddecreasing galactic latitude. The proper motion components measured with VERAare (mu_alpha cos(delta), mu_delta) = (-2.48 +/- 0.32, -2.85 +/- 0.65) masyr^{-1}, converted into (mu_l cos(b), mu_b) = (-2.72 +/- 0.32, -2.62 +/- 0.65)mas yr^{-1} in the Galactic coordinates. The measured proper motionperpendicular to the Galactic plane (mu_b) shows vertical motion away from theGalactic plane with a significance of about ~4-sigma. As for the sourcedistance, the distance measured with VERA is marginal, 2.4^{+1.0}_{-0.6} kpc.Using the distance, an absolute vertical motion (v_{b}) of -17.9 +/- 12.2 kms^{-1} is determined with ~1.5-sigma significance. The tendency of the largevertical motion is consistent with previous VLBI results for NGC 281 associatedwith the same superbubble. Thus, our VLBI results indicate the superbubbleexpansion motion whose origin is believed to be sequential supernovaexplosions.

Absolute Proper Motion of IRAS 00259+5625 with VERA : Indication of Superbubble Expansion Motion