The donor star of SN2010da/NGC 300 ULX-1 is a red supergiant with effective temperature 3650-3900 K and radius about 310 solar radii, making this the second ULX pulsar with a spectroscopically confirmed supergiant donor.
NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows
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abstract
NGC300 ULX1 is an ultra-luminous X-ray pulsar, showing an unprecedented spin evolution, from about 126 s to less than 20 s in only 4 years, consistent with steady mass accretion rate. Following its discovery we have been monitoring the system with Swift/XRT and NICER to further study its properties. We found that even though the observed flux of the system dropped by a factor of $\gtrsim$20, the spin-up rate remained almost constant. A possible explanation is that the decrease in the observed flux is a result of increased absorption of obscuring material due to outflows or a precessing accretion disk.
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Discovery of a red supergiant donor star in SN2010da/NGC 300 ULX-1
The donor star of SN2010da/NGC 300 ULX-1 is a red supergiant with effective temperature 3650-3900 K and radius about 310 solar radii, making this the second ULX pulsar with a spectroscopically confirmed supergiant donor.