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The XXIXth IAU General Assembly in Honolulu adopted IAU 2015 Resolution B2 onrecommended zero points for the absolute and apparent bolometric magnitudescales. The resolution was proposed by the IAU Inter-Division A-G Working Groupon Nominal Units for Stellar and Planetary Astronomy after consulting with abroad spectrum of researchers from the astronomical community. Resolution B2resolves the long-standing absence of an internationally-adopted zero point forthe absolute and apparent bolometric magnitude scales. Resolution B2 definesthe zero point of the absolute bolometric magnitude scale such that a radiationsource with $M_{\rm Bol}$ = 0 has luminosity L$_{\circ}$ = 3.0128e28 W. Thezero point of the apparent bolometric magnitude scale ($m_{\rm Bol}$ = 0)corresponds to irradiance $f_{\circ}$ = 2.518021002e-8 W/m$^2$. The zero pointswere chosen so that the nominal solar luminosity (3.828e26 W) adopted by IAU2015 Resolution B3 corresponds approximately to $M_{\rm Bol}$(Sun) = 4.74, thevalue most commonly adopted in recent literature. The nominal total solarirradiance (1361 W/m$^2$) adopted in IAU 2015 Resolution B3 correspondsapproximately to apparent bolometric magnitude $m_{\rm bol}$(Sun) = -26.832.Implicit in the IAU 2015 Resolution B2 definition of the apparent bolometricmagnitude scale is an exact definition for the parsec (648000/$\pi$ au) basedon the IAU 2012 Resolution B2 definition of the astronomical unit.

IAU 2015 Resolution B2 on Recommended Zero Points for the Absolute and Apparent Bolometric Magnitude Scales