SwePub
Sök i LIBRIS databas

  Utökad sökning

WFRF:(Johnston Peter R.)
 

Sökning: WFRF:(Johnston Peter R.) > (2020-2023) > The Long-term Spect...

The Long-term Spectral Changes of Eta Carinae : Are they Caused by a Dissipating Occulter as Indicated by CMFGEN Models?

Damineli, Augusto (författare)
Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Rua do Matão 1226, Cidade Universitária, São Paulo, Brasil
Hillier, Desmond J. (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
Navarete, Felipe (författare)
SOAR Telescope/NSF's NOIRLab, Avenida Juan Cisternas 1500, 1700000, La Serena, Chile
visa fler...
Moffat, Anthony F. J. (författare)
Département de Physique and Centre de Recherche en Astrophysique du Québec (CRAQ) Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
Weigelt, Gerd (författare)
Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn, Ge
Corcoran, Michael F. (författare)
CRESST II 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
Gull, Theodore. R. (författare)
Exoplanets & Stellar Astrophysics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Richardson, Noel D. (författare)
Department of Physics and Astronomy, Embry-Riddle Aeronautical University, 3700 Willow Creek Road, Prescott, AZ 86301, USA
Ho, Peter (författare)
Department of Applied Mathematics, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Madura, Thomas I. (författare)
Department of Physics and Astronomy, San José State University, One Washington Square, San José, CA 95192-0106, USA
Espinoza-Galeas, David (författare)
Departamento de Astronomia y Astrofisica, Facultad de Ciencias Espaciales, Universidad Nacional Autonoma de Honduras, Bulevar Suyapa, Tegucigalpa, M.D.C, Honduras
Hartman, Henrik (författare)
Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
Morris, Patrick (författare)
California Institute of Technology, IPAC, M/C 100-22, Pasadena, CA 91125, USA
Pickett, Connor S. (författare)
Department of Physics and Astronomy, Embry-Riddle Aeronautical University, 3700 Willow Creek Road, Prescott, AZ 86301, USA
Stevens, Ian R. (författare)
School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Russell, Christopher M. P. (författare)
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
Hamaguchi, Kenji (författare)
CRESST II 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
Jablonski, Francisco J. (författare)
Instituto Nacional de Pesquisas Espaciais/MCTIC, Avenida dos Astronautas 1758, São José dos Campos, SP, 12227-010, Brazil
Teodoro, Mairan (författare)
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
McGee, Padric (författare)
Department of Physics, School of Physical Sciences, University of Adelaide, South Australia, 5005, Australia; SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Cacella, Paulo (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Heathcote, Bernard (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Harrison, Ken M. (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Johnston, Mark (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Bohlsen, Terry (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
Di Scala, Giorgio (författare)
SASER Team, 269 Domain Road, South Yarra, Vic 3141, Australia
visa färre...
 (creator_code:org_t)
Institute of Physics Publishing (IOPP), 2023
2023
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 954
Relaterad länk:
https://doi.org/10.3...
visa fler...
https://ui.adsabs.ha...
https://mau.diva-por... (primary) (Raw object)
https://urn.kb.se/re...
https://doi.org/10.3...
visa färre...
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Eta Carinae (η Car) exhibits a unique set of P Cygni profiles with both broad and narrow components. Over many decades, the spectrum has changed-there has been an increase in observed continuum fluxes and a decrease in Fe II and H I emission-line equivalent widths. The spectrum is evolving toward that of a P Cygni star such as P Cygni itself and HDE 316285. The spectral evolution has been attributed to intrinsic variations such as a decrease in the mass-loss rate of the primary star or differential evolution in a latitudinal-dependent stellar wind. However, intrinsic wind changes conflict with three observational results: the steady long-term bolometric luminosity; the repeating X-ray light curve over the binary period; and the constancy of the dust-scattered spectrum from the Homunculus. We extend previous work that showed a secular strengthening of P Cygni absorptions by adding more orbital cycles to overcome temporary instabilities and by examining more atomic transitions. CMFGEN modeling of the primary wind shows that a time-decreasing mass-loss rate is not the best explanation for the observations. However, models with a small dissipating absorber in our line of sight can explain both the increase in brightness and changes in the emission and P Cygni absorption profiles. If the spectral evolution is caused by the dissipating circumstellar medium, and not by intrinsic changes in the binary, the dynamical timescale to recover from the Great Eruption is much less than a century, different from previous suggestions.

Ämnesord

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

Nyckelord

Stellar phenomena
Stellar mass loss
1619
1613
Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Astrophysics of Galaxies

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy