Introduction

VOSA (VO Sed Analyzer) is a tool designed to perform the following tasks in an automatic manner:

• Read user photometry-tables.
• Query several photometrical catalogs accessible through VO services (increases the wavelength coverage of the data to be analyzed).
• Query VO-compliant theoretical models (spectra) and calculate their synthetic photometry.
• Perform a statistical test to determine which model reproduces best the observed data.
• Use the best-fit model as the source of a bolometric correction.
• Provide the estimated bolometric luminosity for each source.
• Generate a Hertzsprung-Russel diagram with the estimated parameters.
• Provide an estimation of the mass and age of each source