Common Methods of Stellar Spectra Analysis and their Support in Virtual Observatory

TL;DR

This paper reviews methods for stellar spectra analysis, highlights the limitations of current Virtual Observatory tools, and discusses potential implementations to support advanced spectroscopic techniques.

Contribution

It identifies key spectral analysis techniques lacking support in VO tools and compares these with capabilities of legacy software, proposing improvements.

Findings

Current VO tools lack support for advanced spectral analysis methods.

Legacy packages offer more comprehensive analysis features.

Identified specific techniques needed for high-resolution stellar spectroscopy.

Abstract

The proper scientific analysis of a large amount of stellar spectra requires certain capabilities of the analysing tool (e.g. precise semi-automatic fitting for normalisation of the continuum or line-list assisted measurement of spectral lines) as well as flexible list-driven datafile handling. While most astronomical legacy packages comprise powerful analysing and data management features allowing rapid processing of quite complex data, current VO tools are lacking support of even basic capabilities commonly used in stellar spectroscopy. Especially the high resolution optical spectroscopy of stars with rapid line profile variations or of those with complicated emission profiles benefits from a number of specific methods unsupported in todays Virtual Observatory (VO) tools and even lacking definition in VO spectral protocols. In our contribution we identify these techniques, describe their possible implementations and finally give a short overview of several VO-compatible tools emphasising their deficiencies and comparing with the capabilities of common legacy packages.