Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra

Details Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra Automatic Normalization and Equivalent-Width Measurement of High-Resolution Stellar Spectra

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006chjaa...6..689z&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 6, p. 689-696

Astronomy and Astrophysics

Astrophysics

2

Techniques: Radial Velocities, Stars: Abundances

Scientific paper

It is well known that normalization, radial velocity correction and equivalent-width measurement of high-resolution stellar spectra are time-consuming work. In order to improve the efficiency we present an automatic method for these routines. The continuum is determined by fitting the `high points' in the spectrum. After continuum normalization, the program automatically searches for the position of the Hα line and obtains a rough radial velocity, then computes an accurate radial velocity by cross-correlation between the given spectrum and the solar spectrum. In this method, the equivalent-width is automatically measured using Gaussian fitting. A comparison between our results and those from traditional analysis shows that the typical error for equivalent width is around 3.8% in our method. Developing such automatic routines does not mean to replace the interactive reduction method: it is just for a quick extraction of information from the spectra, especially those obtained in large sky surveys.

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