Which star has the highest mass loss rate?
Some very hot and massive stars have strong stellar winds, known spectroscopically as &quot;P Cygni profiles&quot; after the type star. P Cygni 'erupted' in the 17th century to magnitude 3 and is now visible as a mag.5-6 star near the central star of the 'Northern Cross' that is Cygnus. An ordinary pair of binoculars will show it easily. So P Cygni stars have probably the highest mass-loss rate as I believe you are thinking of.