MASS RATIO DETERMINATION FROM H<sub>α</sub> LINES IN BLACK HOLE X-RAY TRANSIENTS
MASS RATIO DETERMINATION FROM H<sub>α</sub> LINES IN BLACK HOLE X-RAY TRANSIENTS
ABSTRACT We find that the mass ratio q in quiescent black hole (BH) X-ray transients is tightly correlated with the ratio of the double-peak separation (DP) to the full width half maximum (FWHM) of the H α emission line, <?CDATA $\mathrm{log}q=-6.88-23.2\quad \mathrm{log}(\mathrm{DP}/\mathrm{FWHM})$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mi>q</mml:mi> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:mn>6.88</mml:mn> …