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We studied the horizontal branch oscillations (HBO) and the band-limitedcomponents observed in the power spectra of the transient neutron star low-massX-ray binary XTE J1701-462 and the persistent "Sco-like" Z source GX 17+2.These two components were studied based on the state-resolved spectra. We foundthat the frequencies of XTE J1701-462 lie on the known correlations (WK andPBK), showing consistency with other types of X-ray binaries (black holes,atoll sources and millisecond X-ray pulsars). However, GX 17+2 is shifted fromthe WK correlation like other typical Z sources. We suggest that the WK/PBKmain track forms a boundary which separates persistent sources from transientsources. The characteristic frequencies of break and HBO are independent ofaccretion rate in both sources, although it depends on spectral models. We alsoreport the energy dependence of the HBO and break frequencies in XTE J1701-462and how the temporal properties change with spectral state in XTE J1701-462 andGX 17+2. We studied the correlation between rms at the break and the HBOfrequency. We suggest that HBO and break components for both sources probablyarise from a similar physical mechanism: Comptonization emission from thecorona. These two components could be caused by same kind of oscillation in acorona who with uneven density, and they could be generated from differentareas of corona. We further suggest that different proportions of theComptonization component in the total flux cause the different distributionbetween GX 17+2 and XTE J1701-462 in the $rms_{\rm{break}}$-$rms_{\rm{HBO}}$diagram.

Correlations in Horizontal Branch Oscillations and Break Components in XTE J1701-462 and GX 17+2