Research

Stars Group

Chemical Abundances

Compact Objects

Cool Stars

Galactic Structure

Space Astrometry

Stellar Clusters

Stellar Pulsation

Whole Earth Telescope

Stars Group : Cool Stars

G. Fritz Benedict, Barbara McArthur


ADS | astro-ph

G. Fritz Benedict  

Senior Research Scientist

website

Research Interests

Space astrometry; search for extrasolar planetary systems; surface photometry of galaxies; barred galaxies.

Group Areas

Planetary Systems, Extrasolar Planetary Systems, Stars, Cool Stars, Galactic Structure, Space Astrometry


ADS | astro-ph

Barbara McArthur  

Research Affiliate-Research Fellow

Research Interests

HST Astrometry; search for extrasolar planets.

Group Areas

Planetary Systems, Extrasolar Planetary Systems, Stars, Cool Stars, Galactic Structure, Space Astrometry



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