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22 Cards in this Set

  • Front
  • Back
what is the apparent shift in a stars position due to the orbital motion of earth?
stellar parallax
what is stellar parallax used for?
measuring the distance of a star
what is the measurment that is often used?
light years
how long is one light year?
9.5 trillion km or 5.8 trillion miles
what three factors is stellar brightness controlled by?
tempature, size, distance
what is the measurment of stars brightness?
magnitude
what is the brightness when a star is viewed from earth?
apparent magnitude
what is a true brightness of a star?
absolute magnitude
are negetive numbers used in magnitude?
yes
what is the brightness of a standard distance absolute magnitude star?
32.6 light years
what are most stars absolute magnitude?
-5 to 15
what is the color of stars with tempatures between 5,000 and 6,000 k?
yellow
what is the star that emits longer wavelength energy so they appear this color?
red
what are stars that obit each other?
binary system
what is the apparent color of very hot stars?
blue
what is the manifistation of a stars surface temp.?
color
what is the brightness or luminosity of a star?
magnitude
what are the parts of the H-R diagram in order from least to greatest?
white dwarfs, red giants, and main sequence stars.
what is clouds of dust and gases that contains the material that forms stars and planets?
nebula
what glows if it is close to a very hot star?
bright nebula
what are 2 kinds of the bright nebula?
emmision, and reflection nebula
what is not close to any bright star that appears opaque?
dark nebula