Detection of a Hot Binary Companion of η Carinae | Zendy

R. C. Iping | Zendy; G. Sonneborn | Zendy; T. R. Gull | Zendy; D. Massa | Zendy; D. J. Hillier | Zendy

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Detection of a Hot Binary Companion of η Carinae

Author(s) -

R. C. Iping,

G. Sonneborn,

T. R. Gull,

D. Massa,

D. J. Hillier

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/498268

Subject(s) - eclipse , flux (metallurgy) , astrophysics , physics , satellite , atmosphere (unit) , astronomy , spectral line , binary number , spectral analysis , ultraviolet , spectroscopy , meteorology , optics , chemistry , mathematics , arithmetic , organic chemistry

We report the detection of a hot companion of $\eta$ Carinae using highresolution spectra (905 - 1180 \AA) obtained with the Far UltravioletSpectroscopic Explorer (\fuse) satellite. Observations were obtained at twoepochs of the 2024-day orbit: 2003 June during ingress to the 2003.5 X-rayeclipse and 2004 April several months after egress. These data show thatessentially all the far-UV flux from \etacar shortward of \lya disappeared atleast two days before the start of the X-ray eclipse (2003 June 29), implyingthat the hot companion, \etaB, was also eclipsed by the dense wind or extendedatmosphere of \etaA. Analysis of the far-UV spectrum shows that \etaB is aluminous hot star. The \nii \wll1084-1086 emission feature suggests that it maybe nitrogen-rich. The observed far-UV flux levels and spectral features,combined with the timing of their disappearance, is consistent with \etacar\being a massive binary system

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