2012A&A...547A.108L


Query : 2012A&A...547A.108L

2012A&A...547A.108L - Astronomy and Astrophysics, volume 547A, 108-108 (2012/11-1)

Comparative modelling of the spectra of cool giants.

LEBZELTER T., HEITER U., ABIA C., ERIKSSON K., IRELAND M., NEILSON H., NOWOTNY W., MALDONADO J., MERLE T., PETERSON R., PLEZ B., SHORT C.I., WAHLGREN G.M., WORLEY C., ARINGER B., BLADH S., DE LAVERNY P., GOSWAMI A., MORA A., NORRIS R.P., RECIO-BLANCO A., SCHOLZ M., THEVENIN F., TSUJI T., KORDOPATIS G., MONTESINOS B. and WING R.F.

Abstract (from CDS):

Our ability to extract information from the spectra of stars depends on reliable models of stellar atmospheres and appropriate techniques for spectral synthesis. Various model codes and strategies for the analysis of stellar spectra are available today. We aim to compare the results of deriving stellar parameters using different atmosphere models and different analysis strategies. The focus is set on high-resolution spectroscopy of cool giant stars. Spectra representing four cool giant stars were made available to various groups and individuals working in the area of spectral synthesis, asking them to derive stellar parameters from the data provided. The results were discussed at a workshop in Vienna in 2010. Most of the major codes currently used in the astronomical community for analyses of stellar spectra were included in this experiment. We present the results from the different groups, as well as an additional experiment comparing the synthetic spectra produced by various codes for a given set of stellar parameters. Similarities and differences of the results are discussed. Several valid approaches to analyze a given spectrum of a star result in quite a wide range of solutions. The main causes for the differences in parameters derived by different groups seem to lie in the physical input data and in the details of the analysis method. This clearly shows how far from a definitive abundance analysis we still are.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: late-type - stars: abundances - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/547/A108): table6.dat table7.dat table8.dat table9.dat table10.dat table11.dat star1.dat star2.dat star3.dat star4.dat>

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 12642 PM* 02 03 40.4889439392 -04 06 12.653704296   7.189 5.609     M1IIICa1 42 0
2 * alf Cet LP? 03 02 16.77307 +04 05 23.0596 6.10 4.17 2.53 1.18 0.02 M1.5IIIa 461 1
3 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1256 2
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
5 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1673 0
6 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1865 0
7 * mu. Leo PM* 09 52 45.8170136628 +26 00 25.024269924 6.50 5.10 3.88 2.97 2.39 K2IIIbCN1Ca1 446 0
8 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2322 1
9 HD 198357 * 20 51 00.7581658752 -37 54 47.992190904   6.889 5.500     K3III 32 0

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