Optical variability of 1RXS J173006.4+033813

Astronomy and Astrophysics – Astronomy

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Optical, X-Ray, Request For Observations, Variables

Scientific paper

In course of the search for optical identifications of poorly studied ROSAT sources we have found an unusual variable object coincident with 1RXS J173006.4+033813. The star USNO-B1.0 0936-0303814 at RA=17h30m06.45s, Dec.=+03o38'20.0" (J2000.0) is showing high-amplitude variability on the time scales from years to minutes, but no indications of orbital period has been found so far. The variability has become obvious from Digitized Sky Survey plates with the object varying by 1.5-3m in IR, R and B between different epochs (two POSS-II plates are available for each band covering the period of 1988-1997).

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