Antalgol variable ST Ophiuchi (52.1907)

Abstract

The variability of ST Ophiuchi was discovered at Harvard from an examination of31 photographs taken during the interval 1893-1904. Professor Pickering announced that the light variation was short duration, evidently about a day or a fraction thereof, and that the rise from minimum to maximum brightness through a range of at least one magnitude was very rapid. The photometric measures of the star made at the Laws Observatory on August 1, 5, and 14, 1908, indicated that it belonged to the antalgol class of variables, and that its period was approximately 0.45.