An Automated System to Classify Stellar Spectra I

Details An Automated System to Classify Stellar Spectra I An Automated System to Classify Stellar Spectra I

2002-12-05

arxiv.org/abs/astro-ph/0212138v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures; to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06260.x

Analyses of stellar spectra often begin with the determination of a number of parameters that define a model atmosphere. This work presents a prototype for an automated spectral classification system that uses a 15 nm-wide region around Hbeta, and applies to stars of spectral types A to K with normal (scaled solar) chemical composition. The new tool exploits synthetic spectra based on plane-parallel flux-constant model atmospheres. The input data are high signal-to-noise spectra with a resolution greater than about 0.1 nm. The output parameters are forced to agree with an external scale of effective temperatures based on the Infrared Flux Method. The system is fast -- a spectrum is classified in a few seconds-- and well-suited for implementation on a web server. We estimate upper limits to the 1-sigma random error in the retrieved effective temperatures, surface gravities, and metallicities as 100 K, 0.3 dex, and 0.1 dex, respectively.

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