SAX J1808.4-3658
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Also known as: V* V4580 Sgr Simbad
Monitoring Data: RXTE/ASM Swift/BAT MAXI
Coordinates
| RA | 18h 08m 27.5s | Dec | -36º 58' 44.3 |
| l | 355.4 | b | -8.15 |
Binary System
Distance
Approximately 2.5 kpc ([1])
Orbit
Period: 2 hours ([2])
Companion
Type: Thought to be a brown dwarf.
Magnitude:
- V = 21.5 ([3])
Available Data
- RXTE: Many observations from 1998 to 2011 for exposures ≤29 ksec.
- CHANDRA: Two observations in 2005 for 14 ksec and 4 ksec, as well as one observation in 2011 for 100 ksec.
- XMM-Newton: Observations from 2000 to 2007. Longest exposure 57 ksec.
- Swift: Many observations from 2005 to 2011. Longest exposure 9 ksec.
- SUZAKU: Many observations in 2008. Longest exposure 42 ksec.
Flux
- Luminosity in quiescence: 5 x 1035 erg.s-1 ([4])
Swift and RXTE observed the 2011 outburst and detected a flux of:
- F(2-10 keV) = 1.71 x 10-9 erg.cm-2.s-1
- F(2.5-25 keV) = 2.35 x 10-9 erg.cm-2.s-1 ([5])
Pulse Profile
Period: 2.49 ms ([6])
Detailed pulse profiles taken from [7].
References
- ↑ in 't Zand, J.J.M., Cornelisse, R., Kuulkers, E., et al., 2001, A&A 372, 916 (NASA ADS)
- ↑ Chakrabarty & Morgan, 1998, in: Green (eds.), IAUC Circ. 6877, 2, (NASA ADS)
- ↑ Homer, L., Charles, P.A., et al., 2001, MNRAS 325, 1471 (NASA ADS)
- ↑ in 't Zand, Heise, Muller, et al., 1998, A&A 331, 25 (NASA ADS)
- ↑ Papitto, A., Bozzo, E., 2001, ATel 3736 (NASA ADS)
- ↑ Wijnands, R., van der Klis, M., 1998, Nature 394, 344 (NASA ADS)
- ↑ Hartman, J.M., Patruno, A., Chakrabarty, D., et al., 2008, ApJ 675, 1469 (NASA ADS)