We study correlations between the burst properties and the position in the
color-color diagram of the low mass X-ray binary 4U 1728-34 using 21 bursts
found in two data sets obtained with the Rossi X-Ray Timing Explorer. Usin
g spectral fits we analyze the spectral evolution during the bursts and det
ermine the burst peak flux, temperature, rise time, and fluence. Using dyna
mical power spectra, we study the properties of the similar to 363 Hz burst
oscillations. We find correlations between fluence, peak flux, the occurre
nce of radius expansion, and the presence of burst oscillations and the pos
ition of the source in the color-color diagram. The radius expansion bursts
with and without burst oscillations differ both with respect to where they
occur in the color-color diagram and in how the radius expansion takes pla
ce. We compare our results with those of a similar study by Muno and cowork
ers for KS 1731-26. Both KS 1731-260 and 4U 1728-34 show more or less the s
ame behavior with respect to the dependence of the presence/absence of the
burst oscillations on the position of the source in the color-color diagram
, but the dependence of most of the spectral burst parameters on the positi
on in the color-color diagram is clearly different. We find that the system
atic absence in 4U 1728-34 of burst oscillations in the "island" state of t
he color-color diagram is not explained by the bursts involving mixed H-He
burning, as Cumming & Bildsten found may be the case in KS 1731-260.