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Special Notice #325: BB Dor monitoring requested for Swift and HST observations

January 21, 2013: AAVSO observations are requested of the SW Sex-type novalike variable BB Dor in support of one and possibly two sets of multiwavelength observations: Dr. Tomohito Ohshima (Department of Astronomy, Kyoto University) and colleagues have triggered Target of Opportunity observations with NASA's Swift gamma-ray burst satellite, and Dr. Boris Gaensicke (Warwick University) is hoping to observe BB Dor in the ultraviolet with HST.

BB Dor is currently very faint now (<18V), according to observations reported to the AAVSO International Database and elsewhere, which makes it a good time to carry out studies of the white dwarf in the system. Dr. Ohshima and colleagues plan to observe BB Dor on January 23; Dr. Gaensicke's schedule is not set but he has requested good coverage of this low state to help in understanding this system (AAVSO Special Notice #323,

BB Dor is very faint in this low state, so visual observations are not feasible. Photometry is requested from now through the end of the observing season.

Coordinates for BB Dor: 05 29 28.64 -58 54 46.6 (2000.0)

Charts may be created using the AAVSO Variable Star Plotter (

Please report observations to the AAVSO International Database as BB DOR.

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


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