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Kinematics and Ultr...
Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae
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Smith, Nathan (författare)
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Morse, Jon A. (författare)
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Gull, Theodore R. (författare)
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visa fler...
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Hillier, D. John (författare)
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Gehrz, Robert D. (författare)
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Walborn, Nolan R. (författare)
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Bautista, Manuel (författare)
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Collins, Nicholas R. (författare)
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Corcoran, Michael F. (författare)
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Damineli, Augusto (författare)
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Hamann, Fred (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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- Johansson, Sveneric (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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Stahl, Otmar (författare)
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Weis, Kerstin (författare)
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(creator_code:org_t)
- American Astronomical Society, 2004
- 2004
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 605:1, s. 405-424
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Abstract
Ämnesord
Stäng
- We present the first ultraviolet and optical images of η Car and itscircumstellar Homunculus nebula, obtained with the Advanced Camera forSurveys/High Resolution Camera (ACS/HRC) on board the Hubble SpaceTelescope (HST). Compared to those at visual wavelengths, UV imagesreveal excess emission 0.1"-0.6" from the central source along the minoraxis that may emanate from the outer parts of η Car's nonsphericalstellar wind, which dominates the UV flux from η Car. The UVemission fills the cavity inside a dust torus measured from infrared(IR) data; within 0.2" of the star the UV emission projects a morphologyreminiscent of the IR torus, but it is a factor of 10 smaller. This``little torus'' seen in the UV may be related to the ``LittleHomunculus'' discovered recently, signifying recurrent mass ejectionswith the same geometry. Finally, we reexamine the kinematics of nebularcondensations near the star (Weigelt objects C and D) in HST images andspectra obtained over the past decade. We measure heliocentricvelocities slower than previous estimates, and from proper motions wederive an ejection date of 1908+/-12 yr, assuming linear motion.However, because of radiative acceleration, these objects may have beenejected earlier-perhaps during the 1890 outburst of η Car.Based on observations made with the NASA/ESA Hubble Space Telescope,obtained at the Space Telescope Science Institute, operated by theAssociation of Universities for Research in Astronomy, Inc., under NASAcontract NAS 5-26555.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Stars: Circumstellar Matter
- Stars: Individual: Constellation Name: η Carinae
- Ultraviolet: Stars
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Smith, Nathan
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Morse, Jon A.
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Gull, Theodore R ...
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Hillier, D. John
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Gehrz, Robert D.
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Walborn, Nolan R ...
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visa fler...
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Bautista, Manuel
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Collins, Nichola ...
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Corcoran, Michae ...
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Damineli, August ...
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Hamann, Fred
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Hartman, Henrik
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Johansson, Svene ...
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Stahl, Otmar
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Weis, Kerstin
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visa färre...
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