ASTR 1102 : Astr Exam 2
Document Summary
For this star, the apparent magnitude would be: a smaller number than the absolute magnitude: the sun"s spectrum peaks in the green region of the spectrum (i. e. green is the most intense color in its spectrum). The spectrum of rigel (the knee of orion) peaks in the short wavelength end of the visible spectrum. The dust makes the star look redder than it really is: each of the following could cause a star to appear red except one. B) any element heavier than hydrogen, c) any element heavier than helium - both: two stars are found to have the same luminosity. However, one star has twice the surface temperature of the other. The hotter star has a quarter the radius of the cooler star: measurements indicate that a certain star has a very high intrinsic brightness (100,000 times as bright as our sun) and yet is relatively cool (3500 k).
