Stars Group : Cool Stars
Stellar Masses
 | Senior Research Scientist Research Interests Space astrometry; search for extrasolar planetary systems; surface photometry of galaxies; barred galaxies. Group Areas Extrasolar Planetary Systems, Galactic Structure, Space Astrometry | |
 | Research Scientist Research Interests HST Astrometry; search for extrasolar planets. Group Areas Space Astrometry, Extrasolar Planetary Systems, Galactic Structure | |
Characteristic regions of the HR Diagram to be explored effectively by astrometers with σπ < 5µas (blue) and σπ < 10µas (yellow), with error bars representative of current knowledge near the blue regions. Supergiants are from Hipparcos, with mean parallax error 37%. A representative sample of O stars is shown, although only six parallaxes are currently available with errors less than 20%. PNe central stars with parallaxes from Harris et al (2007) are also shown, for which the average parallax error is 19%. Main sequence and giant branch data points are from Hipparcos (van Leeuwen 2007 updated to 2008) Data for white dwarfs have been taken from Bergeron et al (2001).
from
Astrometry - Challenging our Understanding of Stellar Structure and Evolution astro-ph