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The chemical feature of Miras in 47 Tuc based on the WINERED spectra

Published online by Cambridge University Press:  11 March 2020

Y. Wang Open the ORCID record for Y. Wang [Opens in a new window] ,
V. D’Orazi ,
N. Matsunaga  and
G. Bono
Y. Wang
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China email: [email protected]
V. D’Orazi
Affiliation:
INAF Osservatorio Astronomico di Padova, Padova, Italy Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Melbourne, Australia
N. Matsunaga
Affiliation:
Department of Astronomy, The University of Tokyo, Tokyo, Japan Laboratory of infrared High-resolution spectroscopy (LiH), Koyama Astronomical Observatory, Kyoto-Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto, Japan
G. Bono
Affiliation:
University of Roma Tor Vergata, Roma, Italy INAF Osservatorio Astronomico di Roma, Monte Porzio Catone RM, Italy
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Abstract

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Variable stars are good stellar tracers. Among various variables, Miras have long periods and are at the evolutionary phase of asymptotic giant branch. Their low effective temperatures lead to a difficulty to determine their chemical composition that since plenty of molecular bands exist in their spectra which even blocks the identifition of metallic lines. However, molecular features are less common in near-infrared (NIR) compared with other wavelength ranges. Here we take advantage of the high-resolution (R ~ 28, 000) spectra obtained with WINERED, which is a NIR spectrograph covering the wavelength range of 0.91–1.35 μm, to analyze and determine the chemical abundances of three Miras in the Galactic globular cluster 47 Tuc (NGC 104). Steps of data reduction and analysis, as well as part of the preliminary results, are briefly shown.

Keywords

stars: variables: otherinfrared: starsstars: abundancesglobular clusters: individual (NGC 104)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 540 - 543
Copyright
© International Astronomical Union 2020

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