The Changing-look Optical Wind of the Flaring X-Ray Transient Swift J1858.6-0814
The Changing-look Optical Wind of the Flaring X-Ray Transient Swift J1858.6-0814
Abstract We present the discovery of an optical accretion disk wind in the X-ray transient Swift J1858.6-0814. Our 90-spectrum data set, taken with the 10.4 m Gran Telescopio Canarias telescope over eight different epochs and across five months, reveals the presence of conspicuous P-Cyg profiles in He i at 5876 …