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Definition
| The emission of energy as electromagnetic waves or as moving subatomic particles. |
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Term
| What is the Stefan Boltzman Law? |
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Definition
| The Stefan–Boltzmann law, also known as Stefan's law, states that the total energy radiated per unit surface area of a black body per unit time is directly proportional to the fourth power of the black body's thermodynamic temperature T |
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Definition
| the wavelength distribution of thermal radiation from a black body at any temperature has essentially the same shape as the distribution at any other temperature, except that each wavelength is displaced on the graph. |
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Term
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Definition
| idealized physical body that absorbs all incident electromagnetic radiation. Because of this perfect absorptivity at all wavelengths, a black body is also the best possible emitter of thermal radiation, which it radiates incandescently in a characteristic, continuous spectrum that depends on the body's temperature. |
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| What are the black body curves? |
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Definition
| relationship between wavelength and the intensity of the light emitted bt a blackbody at a speceified temperature. |
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Term
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Definition
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| What is the emissions spectrum? |
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Definition
| series of bright lines on a dark background |
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Term
| What is the absorbtion spectrum>? |
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Definition
| a series of dark lines superimposed on the otherwise continuous spectrum |
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Term
| If you were to look at spectrum through cold gas? |
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Definition
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| Purpose of studying spectrum? |
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Definition
1) to identify the chemical composition of the star's atmosphere
2) to determine the surface temperature of the star
3) to determine the density of the radiating matter |
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Term
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Definition
| is the total amount of energy emitted into space each second from its surface |
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Term
| What is absolute magnitude? |
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Definition
| is the apparent brightness the star would have if it were placed at a distance of 10 parsecs |
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Term
| A first magnitude is how many times brighter than 3rd magnitude star? |
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Definition
| 6.31 x brighter than 3rd magnitude star |
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Term
| 1.5, 3.3, 5.6, 17.2 which has highest apparent magnitude? |
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Definition
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Term
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Definition
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| G0 G1 G2 G3 G4 G5 G6 hottest? |
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Definition
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Term
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Definition
| a plot of absolute magnitude vs. temperature |
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Term
| most stars are member of what in H-R diagram? |
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Definition
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| when is approx pos of sun in H-R diagram? |
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Definition
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Term
| right bottom corner are red dwarfs they are... |
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Definition
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| below the diagnol belt are white dwarfs they are how small? |
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Definition
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Term
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Definition
| have radii 6 to 10 and 100 times that sun |
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Term
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Definition
| a pair of stars bound by their mutual gravity and revolving around a common center of mass |
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Term
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Definition
| an extremely violent explosion that spreads the outer layers of a massive star into space |
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Definition
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Definition
| a ball of infinite density exploded violently. This explosion hurling matter into the universe, |
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Term
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Definition
| A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. |
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Definition
recessional velocity of any galaxy is directly proportional to its distance from us.
v=hd |
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Definition
| massless particles that move at the spead of light, does not interact with matter |
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Definition
| positively charged electrons |
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Definition
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| sun has been radiating energy for how long? |
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Definition
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Term
| for how much longer will sun radiate? |
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Definition
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Definition
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Definition
| region of space whose gravitational pull is so strong that its escape veloicty equals the speed of light, preventing any radiation or material escaping its surface. |
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Definition
| used to describe the mass in galaxies that emits no detectable radiation but whose existence can be deduced by its gravitational attraction on other objects. |
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Term
| what is luminosity measured in? |
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Definition
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