Simeis 147, SN Remnant
A combined, but totally real, H-R diagram for a metal-poor globular cluster. (Bill Harris)
The effect of age.
The effect of heavy element mass fraction.
Spectroscopic data on SS 433: stellar companion is O or B type, and around 10 solar masses. System shows emission from H and He at 0.26 the speed of light both coming and going.
SS 433 artist's impression. The binary has a 13 day period.
Corkscrew pattern seen at radio wavelengths, indicative of the precessing jets. The precession period is 162 days.
SS 433 is almost certainly associated with the football-shaped supernova remnant number W50. X-ray map.
Radio map of the supernova remnant W50. W50 is about 40,000 years old.