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Sökning: onr:"swepub:oai:DiVA.org:mau-47504" > Eta Carinae :

Eta Carinae : A Tale of Two Periastron Passages

Gull, Theodore R. (författare)
Exoplanets and Stellar Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Navarete, Felipe (författare)
Universidade de São Paulo, IAG, Rua do Matão 1226, Cidade Universitária São Paulo-SP, 05508-090, Brasil
Corcoran, Michael F. (författare)
CRESST and X-ray Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA ; The Catholic University of America, 620 Michigan Avenue N.E., Washington, DC 20064, USA
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Damineli, Augusto (författare)
Universidade de São Paulo, IAG, Rua do Matão 1226, Cidade Universitária São Paulo-SP, 05508-090, Brasil
Espinoza, David (författare)
CRESST and X-ray Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Hamaguchi, Kenji (författare)
CRESST and X-ray Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA; Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
Hartman, Henrik (författare)
Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
Hillier, D. John (författare)
Department of Physics and Astronomy & Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15260, USA
Madura, Thomas (författare)
Department of Physics and Astronomy, San Jose State University, One Washington Square, San Jose, CA 95192, USA
Moffat, Anthony F. J. (författare)
Département de physique, Université de Montréal, C.P. 6128, Succ. C-V, Montréal, QC H3C 3J7, Canada; Centre de Recherche en Astrophysique du Québec, Canada
Morris, Patrick (författare)
California Institute of Technology, IPAC, M/C 100-22, Pasadena, CA 91125, USA
Nielsen, Krister (författare)
The Catholic University of America, 620 Michigan Avenue N.E., Washington, DC 20064, USA
Pittard, Julian M. (författare)
School of Physics and Astronomy, The University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
Pollock, Andrew M. T. (författare)
Department of Physics and Astronomy, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK
Richardson, Noel D. (författare)
Department of Physics and Astronomy, Embry-Riddle Aeronautical University, 3700 Willow Creek Road, Prescott, AZ 86301, USA
Russell, Christopher M. P. (författare)
CRESST and X-ray Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA ; The Catholic University of America, 620 Michigan Avenue N.E., Washington, DC 20064, USA
Stevens, Ian R. (författare)
School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Weigelt, Gerd (författare)
Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Germany
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 (creator_code:org_t)
2021-12-14
2021
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics (IOP). - 0004-637X .- 1538-4357. ; 923:1, s. 102-102
Relaterad länk:
https://doi.org/10.3...
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https://iopscience.i...
https://mdsoar.org/b...
https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Since 2002, the far-ultraviolet (FUV) flux (1150–1680 Å) of Eta Carinae, monitored by the Hubble Space Telescope/Space Telescope Imaging Spectrograph, has increased by an order of magnitude. This increase is attributed to partial dissipation of a line-of-sight (LOS) occulter that blocks the central core of the system. Across the 2020 February periastron passage, changes in the FUV emission show a stronger wavelength dependence than occurred across the 2003 July periastron passage. Across both periastron passages, most of the FUV spectrum dropped in flux then recovered a few months later. The 2020 periastron passage included enhancements of FUV flux in narrow spectral intervals near periastron followed by a transient absorption and recovery to pre-periastron flux levels. The drop in flux is due to increased absorption by singly ionized species as the secondary star plunges deep into the wind of the primary star, which blocks the companion's ionizing radiation. The enhanced FUV emission is caused by the companion's wind-blown cavity briefly opening a window to deeper layers of the primary star. This is the first time transient brightening has been seen in the FUV comparable to transients previously seen at longer wavelengths. Changes in resonance line-velocity profiles hint that the dissipating occulter is associated with material in LOS moving at −100 to −300 km s−1, similar in velocity of structures previously associated with the 1890s lesser eruption

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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Space and Planetary Science
Astronomy and Astrophysics

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