UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up

Stefan Uttenthaler; Hans Ulrich Käufl; Josef Hron; Thomas Lebzelter; Maurizio Busso; Mathias Schultheis

UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up

Stefan Uttenthaler, Hans Ulrich Käufl, Josef Hron, Thomas Lebzelter, Maurizio Busso, Mathias Schultheis

Department of Astrophysics

Publications: Contribution to book › Contribution to proceedings

Abstract

We present high-resolution UVES and CRIRES spectra of bright Oxygen-rich asymptotic giant branch (AGB) stars located in the outer galactic bulge. The UVES spectra were searched for absorption lines of the unstable element Technetium. This element is synthesised in deep layers of AGB stars, thus it is a reliable indicator of both recent s-process activity and third dredge-up. We aim to test theoretical predictions on the luminosity limit for the onset of third dredge-up. Additionally, our investigations have some implications for the age estimate of bulge AGB stars. The near-infrared spectra taken with the recently commissioned CRyogenic InfraRed Echelle Spectrograph CRIRES at ESO¿s VLT aim at studying the connection between the occurrence of Tc, Carbon isotopic ratios and the luminosity of the targets.

Original language	English
Title of host publication	Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006
Editors	N.C. Santos, L. Pasquini, A.C.M. Correia, M. Romanielleo
Place of Publication	Garching
Publisher	Springer-Verlag Berlin
Pages	35-38
Number of pages	4
Publication status	Published - 2008

Publication series

Series	ESO Astrophysics Symposia
ISSN	1431-2433

Austrian Fields of Science 2012

103004 Astrophysics
103003 Astronomy

Cite this

Uttenthaler, S., Käufl, H. U., Hron, J., Lebzelter, T., Busso, M., & Schultheis, M. (2008). UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up. In N. C. Santos, L. Pasquini, A. C. M. Correia, & M. Romanielleo (Eds.), Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006 (pp. 35-38). Springer-Verlag Berlin. ESO Astrophysics Symposia

Uttenthaler, Stefan ; Käufl, Hans Ulrich ; Hron, Josef et al. / UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up. Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. editor / N.C. Santos ; L. Pasquini ; A.C.M. Correia ; M. Romanielleo. Garching : Springer-Verlag Berlin, 2008. pp. 35-38 (ESO Astrophysics Symposia).

@inproceedings{2f490482463a4d78a9af9e552fac04c2,

title = "UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up",

abstract = "We present high-resolution UVES and CRIRES spectra of bright Oxygen-rich asymptotic giant branch (AGB) stars located in the outer galactic bulge. The UVES spectra were searched for absorption lines of the unstable element Technetium. This element is synthesised in deep layers of AGB stars, thus it is a reliable indicator of both recent s-process activity and third dredge-up. We aim to test theoretical predictions on the luminosity limit for the onset of third dredge-up. Additionally, our investigations have some implications for the age estimate of bulge AGB stars. The near-infrared spectra taken with the recently commissioned CRyogenic InfraRed Echelle Spectrograph CRIRES at ESO¿s VLT aim at studying the connection between the occurrence of Tc, Carbon isotopic ratios and the luminosity of the targets.",

author = "Stefan Uttenthaler and K{\"a}ufl, {Hans Ulrich} and Josef Hron and Thomas Lebzelter and Maurizio Busso and Mathias Schultheis",

note = "in Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 29.10.2009: Datenanforderung UNIVIS-DQM-D.RAD-25 (Import Sachbearbeiter) Host publication data : Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 2008 pp. 35-38",

year = "2008",

language = "English",

series = "ESO Astrophysics Symposia",

publisher = "Springer-Verlag Berlin",

pages = "35--38",

editor = "Santos, { N.C.} and { Pasquini}, { L.} and { Correia}, { A.C.M.} and { Romanielleo}, { M.}",

booktitle = "Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006",

}

Uttenthaler, S, Käufl, HU, Hron, J, Lebzelter, T, Busso, M & Schultheis, M 2008, UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up. in NC Santos, L Pasquini, ACM Correia & M Romanielleo (eds), Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Springer-Verlag Berlin, Garching, ESO Astrophysics Symposia, pp. 35-38.

UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up. / Uttenthaler, Stefan; Käufl, Hans Ulrich; Hron, Josef et al.

Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. ed. / N.C. Santos; L. Pasquini; A.C.M. Correia; M. Romanielleo. Garching : Springer-Verlag Berlin, 2008. p. 35-38 (ESO Astrophysics Symposia).

Publications: Contribution to book › Contribution to proceedings

TY - GEN

T1 - UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up

AU - Uttenthaler, Stefan

AU - Käufl, Hans Ulrich

AU - Hron, Josef

AU - Lebzelter, Thomas

AU - Busso, Maurizio

AU - Schultheis, Mathias

N1 - in Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 29.10.2009: Datenanforderung UNIVIS-DQM-D.RAD-25 (Import Sachbearbeiter) Host publication data : Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Edited by N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romanielleo. Garching, Germany, 2008 pp. 35-38

PY - 2008

Y1 - 2008

N2 - We present high-resolution UVES and CRIRES spectra of bright Oxygen-rich asymptotic giant branch (AGB) stars located in the outer galactic bulge. The UVES spectra were searched for absorption lines of the unstable element Technetium. This element is synthesised in deep layers of AGB stars, thus it is a reliable indicator of both recent s-process activity and third dredge-up. We aim to test theoretical predictions on the luminosity limit for the onset of third dredge-up. Additionally, our investigations have some implications for the age estimate of bulge AGB stars. The near-infrared spectra taken with the recently commissioned CRyogenic InfraRed Echelle Spectrograph CRIRES at ESO¿s VLT aim at studying the connection between the occurrence of Tc, Carbon isotopic ratios and the luminosity of the targets.

AB - We present high-resolution UVES and CRIRES spectra of bright Oxygen-rich asymptotic giant branch (AGB) stars located in the outer galactic bulge. The UVES spectra were searched for absorption lines of the unstable element Technetium. This element is synthesised in deep layers of AGB stars, thus it is a reliable indicator of both recent s-process activity and third dredge-up. We aim to test theoretical predictions on the luminosity limit for the onset of third dredge-up. Additionally, our investigations have some implications for the age estimate of bulge AGB stars. The near-infrared spectra taken with the recently commissioned CRyogenic InfraRed Echelle Spectrograph CRIRES at ESO¿s VLT aim at studying the connection between the occurrence of Tc, Carbon isotopic ratios and the luminosity of the targets.

M3 - Contribution to proceedings

T3 - ESO Astrophysics Symposia

SP - 35

EP - 38

BT - Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006

A2 - Santos, N.C.

A2 - Pasquini, L.

A2 - Correia, A.C.M.

A2 - Romanielleo, M.

PB - Springer-Verlag Berlin

CY - Garching

ER -

Uttenthaler S, Käufl HU, Hron J, Lebzelter T, Busso M, Schultheis M. UVES and CRIRES Spectroscopy of AGB Stars: Technetium and the Third Dredge-up. In Santos NC, Pasquini L, Correia ACM, Romanielleo M, editors, Precision Spectroscopy in Astrophysics, Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. Garching: Springer-Verlag Berlin. 2008. p. 35-38. (ESO Astrophysics Symposia).