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Detection of high-v...
Detection of high-velocity material from the wind-wind collision zone of Eta Carinae across the 2009.0 periastron passage
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Groh, J. H. (författare)
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Nielsen, K. E. (författare)
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Damineli, A. (författare)
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Gull, T. R. (författare)
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Madura, T. I. (författare)
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Hillier, D. J. (författare)
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Teodoro, M. (författare)
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Driebe, T. (författare)
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Weigelt, G. (författare)
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- Hartman, Henrik (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Kerber, F. (författare)
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Okazaki, A. T. (författare)
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Owocki, S. P. (författare)
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Millour, F. (författare)
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Murakawa, K. (författare)
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Kraus, S. (författare)
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Hofmann, K. -H. (författare)
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Schertl, D. (författare)
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(creator_code:org_t)
- 2010-07-23
- 2010
- Engelska.
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Ingår i: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 517
- Relaterad länk:
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http://dx.doi.org/10...
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https://www.aanda.or...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We report near-infrared spectroscopic observations of the Eta Carinae massive binary system during 2008-2009 using the CRIRES spectrograph mounted on the 8m UT 1 Very Large Telescope (VLT Antu). We detect a strong, broad absorption wing in He I lambda 10833 extending up to -1900 km s(-1) across the 2009.0 spectroscopic event. Analysis of archival Hubble Space Telescope/Space Telescope Imaging Spectrograph ultraviolet and optical data identifies a similar high-velocity absorption (up to -2100 km s(-1)) in the ultraviolet resonance lines of Si IV lambda lambda 1394, 1403 across the 2003.5 event. Ultraviolet resonance lines from low-ionization species, such as Si II lambda lambda 1527, 1533 and CII lambda lambda 1334, 1335, show absorption only up to -1200 km s(-1), indicating that the absorption with velocities -1200 to -2100 km s(-1) originates in a region markedly more rapidly moving and more ionized than the nominal wind of the primary star. Seeing-limited observations obtained at the 1.6m OPD/LNA telescope during the last four spectroscopic cycles of Eta Carinae (1989-2009) also show high-velocity absorption in He I lambda 10833 during periastron. Based on the large OPD/LNA dataset, we determine that material with velocities more negative than -900 km s(-1) is present in the phase range 0.976 <= phi <= 1.023 of the spectroscopic cycle, but absent in spectra taken at phi <= 0.947 and phi >= 1.049. Therefore, we constrain the duration of the high-velocity absorption to be 95 to 206 days (or 0.047 to 0.102 in phase). We propose that the high-velocity absorption component originates in shocked gas in the wind-wind collision zone, at distances of 15 to 45 AU in the line-of-sight to the primary star. With the aid of three-dimensional hydrodynamical simulations of the wind-wind collision zone, we find that the dense high-velocity gas is along the line-of-sight to the primary star only if the binary system is oriented in the sky such that the companion is behind the primary star during periastron, corresponding to a longitude of periastron of omega similar to 240 degrees-270 degrees. We study a possible tilt of the orbital plane relative to the Homunculus equatorial plane and conclude that our data are broadly consistent with orbital inclinations in the range i = 40 degrees-60 degrees.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: atmospheres
- stars: early-type
- stars: winds
- outflows
- stars: individual: eta
- Carinae
- stars: mass-loss
- binaries: general
Publikations- och innehållstyp
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- ref (ämneskategori)
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- Av författaren/redakt...
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Groh, J. H.
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Nielsen, K. E.
-
Damineli, A.
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Gull, T. R.
-
Madura, T. I.
-
Hillier, D. J.
-
visa fler...
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Teodoro, M.
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Driebe, T.
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Weigelt, G.
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Hartman, Henrik
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Kerber, F.
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Okazaki, A. T.
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Owocki, S. P.
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Millour, F.
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Murakawa, K.
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Kraus, S.
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Hofmann, K. -H.
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Schertl, D.
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visa färre...
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