Nitrogen production in intermediate-mass stars by hot-bottom burning

P. R. Wood; J. A. McSaveney; M. Scholz; J. C. Lattanzio; K. H. Hinkle; A. I. Karakas

doi:10.1063/1.2916959

Nitrogen production in intermediate-mass stars by hot-bottom burning

P. R. Wood, J. A. McSaveney, M. Scholz, J. C. Lattanzio, K. H. Hinkle, A. I. Karakas

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research

Abstract

The PHOENIX spectrograph has been used on Gemini South in order to determine C, N and O abundances for intermediate mass AGB stars in the Magellanic Clouds. Although seven stars were observed, the spectra of three stars were unusable because they were too cool, causing the molecular features to be too strong for modelling. In another two stars, the spectra were contaminated by emission from shock waves. Pulsation modelling showed that spectra should only be taken near minimum visual light to avoid this problem. The two stars analysed for abundances showed strong enhancements of N and reductions of C, consistent with the expectation of hot-bottom burning. The observed N enhancements and C reductions suggest that envelope convection goes deeper than predicted by evolutionary models using the mixing-length theory of convection. These results provide the first observational in-situ confirmation of primary nitrogen production by hot-bottom burning in intermediate mass AGB stars.

Original language	English
Title of host publication	Ninth Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and the Second Perugia Workshop on Nuclear Astrophysics
Pages	163-168
Number of pages	6
Volume	1001
DOIs	https://doi.org/10.1063/1.2916959
Publication status	Published - 1 Dec 2008
Event	Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and Perugia Workshop on Nuclear Astrophysics 2007 - Perugia, Italy Duration: 22 Oct 2007 → 26 Oct 2007 Conference number: 9th http://inspirehep.net/record/878004

Conference

Conference	Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and Perugia Workshop on Nuclear Astrophysics 2007
Country/Territory	Italy
City	Perugia
Period	22/10/07 → 26/10/07
Internet address	http://inspirehep.net/record/878004

Keywords

Abundances
AGB and Post-AGB
Evolution
Stars

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10.1063/1.2916959

Cite this

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title = "Nitrogen production in intermediate-mass stars by hot-bottom burning",

abstract = "The PHOENIX spectrograph has been used on Gemini South in order to determine C, N and O abundances for intermediate mass AGB stars in the Magellanic Clouds. Although seven stars were observed, the spectra of three stars were unusable because they were too cool, causing the molecular features to be too strong for modelling. In another two stars, the spectra were contaminated by emission from shock waves. Pulsation modelling showed that spectra should only be taken near minimum visual light to avoid this problem. The two stars analysed for abundances showed strong enhancements of N and reductions of C, consistent with the expectation of hot-bottom burning. The observed N enhancements and C reductions suggest that envelope convection goes deeper than predicted by evolutionary models using the mixing-length theory of convection. These results provide the first observational in-situ confirmation of primary nitrogen production by hot-bottom burning in intermediate mass AGB stars.",

keywords = "Abundances, AGB and Post-AGB, Evolution, Stars",

author = "Wood, {P. R.} and McSaveney, {J. A.} and M. Scholz and Lattanzio, {J. C.} and Hinkle, {K. H.} and Karakas, {A. I.}",

year = "2008",

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doi = "10.1063/1.2916959",

language = "English",

isbn = "9780735405202",

volume = "1001",

pages = "163--168",

booktitle = "Ninth Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and the Second Perugia Workshop on Nuclear Astrophysics",

note = "Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and Perugia Workshop on Nuclear Astrophysics 2007 ; Conference date: 22-10-2007 Through 26-10-2007",

url = "http://inspirehep.net/record/878004",

}

Wood, PR, McSaveney, JA, Scholz, M, Lattanzio, JC, Hinkle, KH & Karakas, AI 2008, Nitrogen production in intermediate-mass stars by hot-bottom burning. in Ninth Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and the Second Perugia Workshop on Nuclear Astrophysics. vol. 1001, pp. 163-168, Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and Perugia Workshop on Nuclear Astrophysics 2007, Perugia, Italy, 22/10/07. https://doi.org/10.1063/1.2916959

TY - GEN

T1 - Nitrogen production in intermediate-mass stars by hot-bottom burning

AU - Wood, P. R.

AU - McSaveney, J. A.

AU - Scholz, M.

AU - Lattanzio, J. C.

AU - Hinkle, K. H.

AU - Karakas, A. I.

N1 - Conference code: 9th

PY - 2008/12/1

Y1 - 2008/12/1

N2 - The PHOENIX spectrograph has been used on Gemini South in order to determine C, N and O abundances for intermediate mass AGB stars in the Magellanic Clouds. Although seven stars were observed, the spectra of three stars were unusable because they were too cool, causing the molecular features to be too strong for modelling. In another two stars, the spectra were contaminated by emission from shock waves. Pulsation modelling showed that spectra should only be taken near minimum visual light to avoid this problem. The two stars analysed for abundances showed strong enhancements of N and reductions of C, consistent with the expectation of hot-bottom burning. The observed N enhancements and C reductions suggest that envelope convection goes deeper than predicted by evolutionary models using the mixing-length theory of convection. These results provide the first observational in-situ confirmation of primary nitrogen production by hot-bottom burning in intermediate mass AGB stars.

AB - The PHOENIX spectrograph has been used on Gemini South in order to determine C, N and O abundances for intermediate mass AGB stars in the Magellanic Clouds. Although seven stars were observed, the spectra of three stars were unusable because they were too cool, causing the molecular features to be too strong for modelling. In another two stars, the spectra were contaminated by emission from shock waves. Pulsation modelling showed that spectra should only be taken near minimum visual light to avoid this problem. The two stars analysed for abundances showed strong enhancements of N and reductions of C, consistent with the expectation of hot-bottom burning. The observed N enhancements and C reductions suggest that envelope convection goes deeper than predicted by evolutionary models using the mixing-length theory of convection. These results provide the first observational in-situ confirmation of primary nitrogen production by hot-bottom burning in intermediate mass AGB stars.

KW - Abundances

KW - AGB and Post-AGB

KW - Evolution

KW - Stars

UR - http://www.scopus.com/inward/record.url?scp=84874993841&partnerID=8YFLogxK

U2 - 10.1063/1.2916959

DO - 10.1063/1.2916959

M3 - Conference Paper

AN - SCOPUS:84874993841

SN - 9780735405202

VL - 1001

SP - 163

EP - 168

BT - Ninth Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and the Second Perugia Workshop on Nuclear Astrophysics

T2 - Torino Workshop on Evolution and Nucleosynthesis in AGB Stars and Perugia Workshop on Nuclear Astrophysics 2007

Y2 - 22 October 2007 through 26 October 2007

ER -

Nitrogen production in intermediate-mass stars by hot-bottom burning

Abstract

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Keywords

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