Uma Biblioteca de Espectros Estelares no Infravermelho Próximo para Medidas de Cinemática Estelar em Galáxias

Authors

  • Marlon R. Diniz UFSM
  • Rogemar A. Riffel Universidade Federal de Santa Maria

DOI:

https://doi.org/10.5902/2179460X9361

Abstract

In this work, we have expanded the library in the K-band spectra of thelate-type stars in the Gemini observatory through the observationsobtained with the Near-infrared Integral Field Spectrograph (NIFS),available in the Gemini archive. The main application of this library isthe measurement of stellar kinematics in galaxies by the fitting of theCO band heads at ~ 2.3 mm. To obtain reliable measurements of velocitydispersion ( !*) it is necessary to include different spectral types,representative of the stellar population which produces such absorptions.We present spectra of 20 stars with spectral resolution of ~ 3.2 Å,including 11 K stars, 8 M and 1 of the type G, representing an increase of50%. The inclusion of eight spectra of M-type stars has a fundamentalimportance because such stars were absent the original library. Thisinclusion allows more robust measurements for the stellar !* in galaxies.We present plots of equivalent width (EW) for CaIl 2.2636m m,FeIl 2.2387l m, NaIl 2.2070m m, 12COl 2.2935m m, 13COl 2.3448mmand MgIl 2.2814m m versus the effective temperature (Teff ) of the star.These plots show that stars with lower Teff have greater values of EW forthe first five lines. While for MgIl 2.2814m m, the EW has a constantvalue of ~ 0.6 Å for stars of different temperatures. Finally, the use ofthe expanded library will provide more reliable measurements of stellarkinematics in the galaxies.

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Published

2011-12-20

How to Cite

Diniz, M. R., & Riffel, R. A. (2011). Uma Biblioteca de Espectros Estelares no Infravermelho Próximo para Medidas de Cinemática Estelar em Galáxias. Ciência E Natura, 33(2), 43–56. https://doi.org/10.5902/2179460X9361

Issue

Vol. 33 No. 2 (2011)

Section

Physics

License

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