VOSA. Help and Documentation

Version 7.5, July 2022

1. Introduction
2. Input files
2.1. Upload files
2.2. VOSA file format
2.3. Single object
2.4. Manage files
2.5. Archiving
2.6. Filters
3. Objects
3.1. Coordinates
3.2. Distances
3.3. Extinction
4. Build SEDs
4.1. VO photometry
4.2. SED
4.3. Excess
5. Analysis
5.1. Model Fit
5.2. Bayes analysis
5.3. Template Fit
5.4. Templates Bayes
5.5. Binary Fit
5.6. HR diagram
5.7. Upper Limits
5.8. Statistics
6. Save results
6.1. Download
6.2. SAMP
6.3. References
6.4. Log file
6.5. Plots
7. VOSA Architecture
8. Phys. Constants
9. FAQ
10. Use Case
11. Quality
11.1. Stellar libraries
11.2. VO photometry
11.3. Binary Fit Quality
12. Credits
12.1. VOSA
12.2. Th. Spectra
12.3. Templates
12.4. Isochrones
12.5. VO Photometry
12.6. Coordinates
12.7. Distances
12.8. Dereddening
12.9. Extinction
13. Helpdesk
14. About
. Excess calculation
. Total flux calculation
. VOphot quality info


There are some object properties that are important in order to be able to use all the potential of VOSA and get reliable results.

  • Object coordinates are necessary to be able to make VO searches (for properties or photometry). Most operations in which we search for information in VO catalogs have to be made in terms of the object coordinates (and some search radius around them). If the coordinates are not available, you won't be able to search the VO.
  • Object distance is necessary to be able to calculate bolumetric luminosities from the model fit results and then use these luminosities in the HR diagram to try to get estimation of the mass and age.
  • The value of the visual extinction, Av, is necessary to deredden the observed photometry.

You can upload all this information in your Input file if you know it, but VOSA also can help to find values for these object properties searching in VO catalogs.