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First Images of the...
First Images of the Molecular Gas around a Born-again Star Revealed by ALMA
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- Tafoya, Daniel, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Toala, Jesus A. (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Unnikrishnan, Ramlal, 1997 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Guerrero, Martin A. (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- Kimeswenger, Stefan (författare)
- University of Innsbruck,Universidad Catolica del Norte
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- van Hoof, Peter A. M. (författare)
- Royal Observatory of Belgium
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- Zapata, Luis A. (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Treviño Morales, Sandra, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Rodriguez-Gonzalez, Janis B. (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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(creator_code:org_t)
- 2022-01-24
- 2022
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 925:1
- Relaterad länk:
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https://doi.org/10.3...
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- Born-again stars allow probing stellar evolution in human timescales and provide the most promising path for the formation of hydrogen-deficient post-asymptotic giant branch objects, but their cold and molecular components remain poorly explored. Here we present ALMA observations of V 605 Aql that unveil for the first time the spatio-kinematic distribution of the molecular material associated with a born-again star. Both the continuum and molecular line emission exhibit a clumpy ring-like structure with a total extent of approximate to 1 '' in diameter. The bulk of the molecular emission is interpreted as being produced in a radially expanding disk-like structure with an expansion velocity v(exp) similar to 90 km s(-1) and an inclination i approximate to 60 degrees with respect to the line of sight. The observations also reveal a compact high-velocity component, v(exp) similar to 280 km s(-1), that is aligned perpendicularly to the expanding disk. This component is interpreted as a bipolar outflow with a kinematical age tau less than or similar to 20 yr, which could either be material that is currently being ejected from V 605 Aql, or is being dragged from the inner parts of the disk by a stellar wind. The dust mass of the disk is in the range M-dust similar to 0.2-8 x 10(-3) M-circle dot, depending on the dust absorption coefficient. The mass of the CO is MCO approximate to 1.1 x 10(-5) M-circle dot, which is more than three orders of magnitude larger than the mass of the other detected molecules. We estimate a C-12/C-13 ratio of 5.6 +/- 0.6, which is consistent with the single stellar evolution scenario in which the star experienced a very late thermal pulse instead of a nova-like event as previously suggested.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Tafoya, Daniel, ...
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Toala, Jesus A.
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Unnikrishnan, Ra ...
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Vlemmings, Woute ...
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Guerrero, Martin ...
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Kimeswenger, Ste ...
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van Hoof, Peter ...
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Zapata, Luis A.
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Treviño Morales, ...
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Rodriguez-Gonzal ...
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