4U 0115+634

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Other Names

General Characteristics

  • optical companion: O9e star ([1])
  • distance: [math]\displaystyle{ 7-8\,\text{kpc} }[/math] ([2])

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

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

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  5. 5.0 5.1 Cite error: Invalid <ref> tag; no text was provided for refs named Ferrigno2009
  6. 6.0 6.1 Cite error: Invalid <ref> tag; no text was provided for refs named White83
  7. 7.0 7.1 Cite error: Invalid <ref> tag; no text was provided for refs named Nagase91
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  11. Cite error: Invalid <ref> tag; no text was provided for refs named Heindl2004