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Nucleosynthesis in AGB stars traced by oxygen isotopic ratios I. Determining the stellar initial mass by means of the O-17/O-18 ratio
Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium..
Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium.;Univ Amsterdam, Astron Inst Anton Pannekoek, POB 94249, NL-1090 GE Amsterdam, Netherlands..
Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden..
Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D B2401, B-3001 Leuven, Belgium.;Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden..
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 600, A71Article in journal (Refereed) Published
Abstract [en]

Aims. We seek to investigate the O-17/O-18 ratio for a sample of AGB stars containing M-, S-, and C-type stars. These ratios are evaluated in relation to fundamental stellar evolution parameters: the stellar initial mass and pulsation period.

Methods. Circumstellar (CO)-C-13-O-16, (CO)-C-12-O-17, and (CO)-C-12-O-18 line observations were obtained for a sample of nine stars with various single-dish long-wavelength facilities. Line intensity ratios are shown to relate directly to the surface O-17/O-18 abundance ratio.

Results. Stellar evolution models predict the O-17/O-18 ratio to be a sensitive function of initial mass and to remain constant throughout the entire TP-AGB phase for stars initially less massive than 5 M-circle dot. This makes the measured ratio a probe of the initial stellar mass.

Conclusions. Observed O-17/O-18 ratios are found to be well in the range predicted by stellar evolution models that do not consider convective overshooting. From this, accurate initial mass estimates are calculated for seven sources. For the remaining two sources, there are two mass solutions, although there is a larger probability that the low-mass solution is correct. Finally, we present hints at a possible separation between M/S- and C-type stars when comparing the O-17/O-18 ratio to the stellar pulsation period.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2017. Vol. 600, A71
Keyword [en]
stars: AGB and post-AGB, stars: evolution, stars: fundamental parameters, circumstellar matter
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-324337DOI: 10.1051/0004-6361/201629195ISI: 000400754000041OAI: oai:DiVA.org:uu-324337DiVA: diva2:1110349
Funder
EU, FP7, Seventh Framework ProgrammeEU, European Research Council, 646758 AEROSOLSwedish Research Council
Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2017-06-15Bibliographically approved

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