4U 0115+634
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Other Names
- V635 Cassiopeiae (SIMBAD)
General Characteristics
Orbital Parameters
- orbital period: [math]\displaystyle{ P_{\text{Orb}} = 24.31617^{+0.00005}_{-0.00007}\,\text{d} }[/math] (Müller et al. in prep.)
- epoch of periastron passage: [math]\displaystyle{ T_0 = 49279.2677(34)\,\text d }[/math] ([3])
- projected semimajor axis:[math]\displaystyle{ a_{\text x}\sin i = 140.13(8)\,\text{lt-s} }[/math] ([3])
- eccentricity:[math]\displaystyle{ e = 0.3402(2) }[/math] ([3])
- longitude of periastron: [math]\displaystyle{ \omega = 47.66(9)^{\circ} }[/math] ([3])
Pulsations
- pulse profiles strongly energy dependent (Müller et al. in prep.)
- double peaked at low energies
- single peaked at high energies
- phase lags at the energies of cyclotron scattering features (Ferrigno et al. submitted)
Quantitative Spectral Analysis
- outburst 1999 ([4],[5])
- NPEX x CYAB (x CYAB) describes the RXTE-observation well
- Becker & Wolff model and Soft Thermal Comptonization describes one Beppo-SAX observation well
- outburst 2008 (Müller et al. in prep.)
- (PL x FDcut + BlackBody + 10keV feature) x GAUABS x GAUABS describes the RXTE-observation well (preliminary)
Cyclotron Features
- fundamental resonance at ~11 keV ([6], [7])
- second harmonic at ~23 keV ([8], [6], [7])
- third harmonic at ~36 keV ([9])
- fourth harmonic at ~50 keV ([10])
- fifth harmonic at ~60 keV ([11], [5])
References
- ↑ Unger, S. J., Roche, P., Negueruela, I., et al., 1998, A&A, 336, 960 (NASA ADS)
- ↑ Negueruela, I., Okazaki, A.T., Fabregat, J., et al., 2001, A&A, 369, 117 (NASA ADS)
- ↑ 3.0 3.1 3.2 3.3 Bildsten, L., Chakrabarty, D., Chiu, J., et al., 1997, ApJS, 113, 367 (NASA ADS)
- ↑ Nakajima, M., Mihara, T., Makishima, K., & Niko, H., 2006, ApJ, 646, 1125 (NASA ADS)
- ↑ 5.0 5.1 Ferrigno, C., Becker, P.A., Segreto, A., et al. 2009, A&A, 498, 825 (NASA ADS)
- ↑ 6.0 6.1 White, N., Swank, J., & Holt, S. S., 1983, ApJ, 270, 711 (NASA ADS)
- ↑ 7.0 7.1 Nagase, F., Dotani, T., Tanaka, Y., et al., 1991, ApJ, 375, L49 (NASA ADS)
- ↑ Wheaton, W. A., Doty, J. P., Primini, F. A., et al., 1979, Nature, 282, 240 (NASA ADS)
- ↑ Heindl, W.A., Coburn, W., Gruber, D.E., et al., ApJ, 521, L49 (NASA ADS)
- ↑ Santangelo, A., Segreto, A., Giarrusso, S., et al., 1999, ApJ, 523, L85 (NASA ADS)
- ↑ Heindl, W.A., Rothschild, R. E., Coburn, W., et al., 2004, AIP Conference Proceedings, 714, 323 (NASA ADS)