Measuring Radii and Temperatures of Stars. Definitions (again…) Direct measurement of radii Speckle Interferometry Occultations Eclipsing binaries Photometric determinations of radii Bolometric flux Surface brightness Absolute flux Determining temperatures Absolute flux
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R = radius
r = distance
The diameter of Aldebaran is ~40 RSUN. Its distance is about 19 pc. The angular diameter of Aldebaran is …
(work in cgs or MKS units or work in AU and use the definition of a parsec)
What would the angular diameter of the Sun be at 10 pc?
(R is radius in solar units, r is distance in parsecs)
PV(B-V)=logTeff – 0.1BC
“The determination of Teff of B, A and F main sequence stars from the continuum between 3200 A and 3600 A;” Sokolov, N. A.; Astronomy and Astrophysics Supplement, v.110, p.553