Concepts from ASTR1010 & Names, Catalogs, URLs. ASTR 3010 Lecture 2 Chapter 1 & 4. Luminosity, flux density, and surface brightness . Luminosity = Total energy emitted by the source per unit time (ergs/sec) independent on the distance to the source
Chapter 1 & 4
1,370 W/m2 = Solar constant
Stefan-Boltzmann Law, and the wavelength with the peak flux changes as
m: apparent magnitude, M: absolute magnitude (when a stars is at 10pc), F: flux, d: distance in parcsec, F0: zero magnitude flux
“the brightest reddish star on the right shoulder”
How about variable stars?
currently there are ≈10,000 catalogs
?? How can we navigate through these many catalogs??
Wien’s displacement Law