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Determination of stellar atmospheric parameters for the X-shooter Spectral Library

Arentsen, A. (2016) Determination of stellar atmospheric parameters for the X-shooter Spectral Library. Master's Thesis / Essay, Astronomy.

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In this work, we derive stellar atmospheric parameters for the new X-shooter Spectral Library (XSL, Chen et al. 2014a,b). The spectra in XSL will be used in stellar population modeling, therefore the stars need accurate and uniform stellar atmospheric parameters. We investigate two different methods to determine these parameters, using the current version of the spectra in the library. The first method is Starfish (Czekala et al. 2015), a Bayesian inference full spectrum fitting code that extensively samples the parameter space. We find that Starfish is not suitable for the automatic determination of stellar atmospheric parameters for a few hundred stars because of its long run-time and the need for user interaction. The second method is ULySS (Koleva et al. 2009), a full spectrum fitting software that performs a relatively simple χ2 fitting. We find that it is suitable for the mass-production of stellar atmospheric parameters and that it can produce a uniform set of parameters for XSL. We test different settings and decide to use an empirical interpolator made from the MILES spectra (Sánchez-Blázquez et al. 2006, Prugniel et al. 2011) over a wavelength range of 4000-5500 Å to determine the final stellar atmospheric parameters for XSL. A new version of XSL will be available soon, and we discuss possible improvements of the current method for the final determination of the parameters.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:25
Last Modified: 15 Feb 2018 08:25

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