Undersökning av döende stjärnor: Massförlust och molekyler för stjärnor på den asymptotiska jättegrenen

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dc.contributor.authorGustafsson, Johan
dc.contributor.authorHirvonen, Per
dc.contributor.authorStrömfors, Amanda
dc.contributor.authorWäpling, Sara
dc.contributor.departmentChalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Space, Earth and Environmenten
dc.date.accessioned2019-07-05T11:52:44Z
dc.date.available2019-07-05T11:52:44Z
dc.date.issued2019
dc.description.abstractThe study aims to investigate the mass outflow from evolved stars. Emission lines from nine stars, observed under the project DEATHSTAR, were studied. The gasmass- loss rates were approximated using a simplified formula based on the rotational emission lines of 12CO. Furthermore, the project aims to determine the molecular composition of two of the nine stars, W Hya and R For. The calculated gas-mass-loss rates varied from 10−7 to 10−5M yr−1. The dust-mass and dust-mass-loss rate calculations were only attempted regarding the star W Hya, though no dust-mass and dust-mass-loss could be determined from the data. The observed emission spectra from W Hya and R For contained at least 16 and 17 molecular emission lines respectively. The outflow of W Hya is dominated by oxygen based molecules, while the outflow of R For contains carbon based molecules. Finally, the emission lines from 12CO for several stars show evidence of asymmetric envelopes. The obtained profile for R Hya hints at multiple velocity components and might warrant a more in-depth investigation in the future.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/256820
dc.language.isoswe
dc.setspec.uppsokTechnology
dc.subjectFysik
dc.subjectAstronomi, astrofysik och kosmologi
dc.subjectPhysical Sciences
dc.subjectAstronomy, Astrophysics and Cosmology
dc.titleUndersökning av döende stjärnor: Massförlust och molekyler för stjärnor på den asymptotiska jättegrenen
dc.type.degreeExamensarbete för kandidatexamensv
dc.type.degreeBachelor Thesisen
dc.type.uppsokM2
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