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Very long-term X-ray variations in LMXBs: solar cycle-like variations in the donor? | | M.M.Kotze
; P.A.Charles
; | | Date: |
21 Nov 2009 | | Abstract: | Long-term monitoring of Low Mass X-ray Binaries (LMXBs) by the All Sky
Monitor on board the Rossi X-ray Timing Explorer now covers ~13 yrs and shows
that certain LMXB types display very long-term (~several to tens of years)
quasi-periodic modulations. These timescales are much longer than any
"super-orbital" periods reported hitherto and likely have a different origin.
We suggest here that they are due to long-term variations in the mass-transfer
rate from the donor, which are a consequence of solar-like magnetic cycles that
lead to orbital period changes (as proposed by Richman, Applegate & Patterson
1994 for similar long-term variations in CVs). Atoll sources display much
larger amplitude modulations than Z sources over these timescales, presumably
because Z sources are Eddington limited and hence unable to respond as readily
as Atoll sources to fluctuations in the mass-transfer rate from the donor. | | Source: | arXiv, 0911.4188 | | Services: | Forum | Review | PDF | Favorites | |
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