onr:"swepub:oai:DiVA.org:uu-107911"
Search: onr:"swepub:oai:DiVA.org:uu-107911" > The photospheric so...
- 1 of 1
- Previous record
- Next record
- To hitlist
- Caffau, E. (author)
The photospheric solar oxygen project - I. Abundance analysis of atomic lines and influence of atmospheric models
- Article/chapterEnglish2008
Publisher, publication year, extent ...
- 2008-07-09
- EDP Sciences,2008
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:uu-107911
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107911URI
- https://doi.org/10.1051/0004-6361:200809885DOI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- Context. The solar oxygen abundance has undergone a major downward revision in the past decade, the most noticeable one being the update including 3D hydrodynamical simulations to model the solar photosphere. Up to now, such an analysis has only been carried out by one group using one radiation-hydrodynamics code. Aims. We investigate the photospheric oxygen abundance considering lines from atomic transitions. We also consider the relationship between the solar model used and the resulting solar oxygen abundance, to understand whether the downward abundance revision is specifically related to 3D hydrodynamical effects. Methods. We performed a new determination of the solar photospheric oxygen abundance by analysing different high-resolution high signal-to-noise ratio atlases of the solar flux and disc-centre intensity, making use of the latest generation of CO5BOLD 3D solar model atmospheres. Results. We find 8.73 <= log (N-O/N-H) + 12 <= 8.79. The lower and upper values represent extreme assumptions on the role of collisional excitation and ionisation by neutral hydrogen for the NLTE level populations of neutral oxygen. The error of our analysis is +/- (0.04 +/- 0.03) dex, the last being related to NLTE corrections, the first error to any other effect. The 3D "granulation effects" do not play a decisive role in lowering the oxygen abundance. Conclusions. Our recommended value is log (N-O/N-H) = 8.76 +/- 0.07, considering our present ignorance of the role of collisions with hydrogen atoms on the NLTE level populations of oxygen. The reasons for lower O abundances in the past are identified as (1) the lower equivalent widths adopted and (2) the choice of neglecting collisions with hydrogen atoms in the statistical equilibrium calculations for oxygen.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- Sun : abundances
- Sun : photosphere
- line : formation
- hydrodynamics
- convection
- radiative transfer
- Physics
- Fysik
- Astronomy with specialization in Astrophysics
- Astronomi med intiktning mot astrofysik
Added entries (persons, corporate bodies, meetings, titles ...)
- Ludwig, H. -G. (author)
- Steffen, M. (author)
- Ayres, T. R. (author)
- Bonifacio, P. (author)
- Cayrel, R. (author)
- Freytag, BerndUppsala universitet,Institutionen för fysik och astronomi,Teoretisk astrofysik(Swepub:uu)befre677 (author)
- Plez, B.Uppsala universitet,Institutionen för fysik och astronomi (author)
- Uppsala universitetInstitutionen för fysik och astronomi (creator_code:org_t)
Related titles
- In:Astronomy and Astrophysics: EDP Sciences488:3, s. 1031-10460004-63611432-0746
Internet link
Find in a library
- Astronomy and Astrophysics (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Caffau, E.
- Ludwig, H. -G.
- Steffen, M.
- Ayres, T. R.
- Bonifacio, P.
- Cayrel, R.
- show more...
- Freytag, Bernd
- Plez, B.
- show less...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- and Astronomy Astrop ...
- Articles in the publication
- Astronomy and As ...
- By the university
- Uppsala University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
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.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
