Color-Magnitude Diagram
Gaia Collaboration, 2018, A&A, 616, A10
Color-Magnitude Diagram
Color-Magnitude Diagram
What we will do
• Field stars
• Take the HRDs, use different grids and estimate the mass, radius
and age for all individual stars
• Sort stars according to metallicity => same task
• Calculate differences and search for correlations and offsets
• Open clusters
• Johnson, Gaia and 2MASS photometry: get cluster parameters
• Calculate differences and search for correlations and offsets
• Globular clusters
• Johnson photometry: get cluster parameters
• Calculate differences and search for correlations and offsets
Samples for comparison
• Field stars
• Stroemgren uvbyb photometry: intrinsically reddening and
metallicity calibration
• Geneva 7-colour photometry: reddening used from Stroemgren
uvbyb photometry plus nearby stars without reddening, also
metallicity calibration available
• Open clusters
• Johnson, Gaia and 2MASS photometry, cleaned data sets
• Globular clusters
• Johnson photometry [homework]
2MASS photometry
Gaia photometry