MXB 0656-07
Transient source, discovered in 1975 by SAS-3 ([1]).
In quiescence since 1975/1976, it became active again in 2003 with an outburst in October 2003 ([2]).
New outburst detected in November 2007 ([3]).
Monitoring data: RXTE/ASM, Swift/BAT, MAXI, Fermi/GBM
Coordinates
RA 06h 58m 16.80s, DEC -07° 12' 37.8 (J2000)
l 220.1283°, b -01.7694° (J2000)
Optical companion
O9.7Ve ([(biblio:Pakull03)]).
Binary system
Distance: 3.9 +/-0.1 kpc [4]
Orbit
The orbital period of the system was determined to 101.2 d using the outburst spacing seen in RXTE/ASM and Swift/BAT ([5]). The remaining orbital parameters of the system remain undetermined.
Spectrum
Continuum spectrum well described with a power law with an exponential cutoff.
Cyclotron line at ~35 keV discovered by [6] with RXTE.
Study of the cyclotron line with RXTE in [4].
Pulse period
Average pulse period of 160.4+/-0.4 s, spin-up Pdot=-0.0202+/-0.0003 s/day during the 2003 outburst.
Pulse period monitored with Fermi/GBM
Pulse profiles
Single-peaked and sinusoidal in all energy ranges (2-60 keV).
Pulsed fraction (Fmax-Fmin/Fmax) increases steadily from 26% in the 2-5 keV band up to 40% in the 30-60 keV band [4].
References
- ↑ Cite error: Invalid
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