OT 1809+31 quiescent candidates UBVR photometry (Motch+ 1990)

Details OT 1809+31 quiescent candidates UBVR photometry (Motch+ 1990) OT 1809+31 quiescent candidates UBVR photometry (Motch+ 1990)

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat..32350185m&link_type=abstract

VizieR On-line Data Catalog: J/A+A/235/185. Originally published in: 1990A&A...235..185M

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Stars: Variable, Photometry: Ubv, Gamma Rays

Scientific paper

We have obtained deep U, B, V, and R band CCD images of the field containing the repeating optical transient discovered by Hudec et al. (1988, see references). Compared to previously reported optical studies of this field, the data presented here have a higher sensitivity and improved spatial resolution. The 30" by 10" error ellipse derived from the brightest optical flash recorded on 1946 August 31 contains only faint (V>25) galaxies. The upper limit on the brightness of any stellar object in the error area is U=23.2, B=26.5 and V=25.3. Photometric analysis of all objects present in the whole CCD field fails to detect any convincingly variable star. Comparing CCD frames obtained about 10 months apart we derive an upper limit of ~0.2"/yr on the proper motion of any stellar object brighter than V~24 and located within 50" from the optical flash position. UBV photometry reveals that the bluest stellar object present in the CCD frame (V=22.9, B-V=0.0, U-B=-0.9) is located only ~9.6' away from the edge of the error oval and could thus be the quiescent counterpart of the optical transient if the error ellipse is slightly underestimated or if the object proper motion is of the order of the upper limit derived here. Other stellar objects located inside this "proper motion allowed area" are disc M dwarfs. We present various constraints that our deep observations put on the nature of the optical transient counterpart depending on assumed proper motion. We discuss the likely nature of the UV excess object and its possible connection to the repeating optical transient and to the class of gamma-ray bursters. (1 data file).

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