Using an Extreme Ultraviolet Explorer ( EUVE ) spectrum , we confirm the identification of a white dwarf companion to the B9.5V star 16 Dra ( HD150100 ) , and constrain its surface temperature to lie between 29,000K and 35,000K .
This is the third B star + white dwarf non-interacting Sirius-type binary to be confirmed , after y Pup ( HR2875 , HD59635 ) and \theta Hya ( HR3665 , HD79469 ) .
16 Dra and its white dwarf companion are members of a larger resolved proper motion system including the B9V star 17 Dra A ( HD150117 ) .
The white dwarf must have evolved from a progenitor more massive than this star , M _ { MS } \approx 3.7 M _ { \odot } .
White dwarf companions to B stars are important since they set an observational limit on the maximum mass for white dwarf progenitors , and can potentially be used to investigate the high mass ends of the initial-final mass relation and the white dwarf mass-radius relation .