Exam #2 Flashcards
What would be the distance from earth to a star if its:
Apparent magnitude is too and it’s absolute magnitude is six?
Closer than 10 parsecs
What would be the distance from earth to a star if its:
Apparent magnitude is 15 and it’s absolute magnitude is 1?
Further than 10 parsecs
What would be the distance from earth to a star if its:
Apparent magnitude is 3 and absolute magnitude is -3?
Further than 10 parsecs
What spectral class star would have a peak wavelength that it emits shifted farthest towards the “red” end of the spectrum?
A M7 star
What spectral class star would have its peak wavelength that it Emirates shifted farthest towards the blue end of the spectrum?
A B7 star
Which spectral type star would email the least yellow light?
M5
Which spectral type star what emit the least blue light?
M5
Which spectral type star would emit the least red light?
M5
Which color would a B3 spectral type star be?
Blue-ish
Assume you are observing the spectra of two different stars. Star a exhibits a dark line shift by 10 nm towards the “blue” end of the spectrum while Star B exhibits a dark line shift by five nano meters towards the red end of the spectrum. From this data, what other conclusions can you make about these stars?
Star A has a greater radio velocity Than star B
Considering Wiens law, which star from below would have the highest surface temperature?
A star with peak wavelength in the “violet”
The Demon Star, Algol, represents the head of _________ in the constellation Perseus.
None
What is the approximate apparent magnitude of the sun?
-26.5
What is the approximate absolute magnitude of the sun?
5
Another a name for the star “Sirius” is:
The Dog Star
Every 5 magnitudes on the magnitude scale is equivalent to _______ times in brightness (light output).
100
How many known Stars are within (closer than) a parsec from the Sun?
0
Approximately how many stars, in total, have parallaxes less than 1 arc second, using the stellar triangulation method (baseline of 1au)?
Billions
Which star system listed has the largest parallax?
Alpha Centauri (4.3 ly away)
Which star system listed has the smallest parallax?
Deneb (1600 ly away)
Henrietta Leavitt’s Period-Luminosity Relation for Cepheid Variable stars allowed Edwin Hubble to determine:
The distance of these stars
Henrietta Leavitt’s discovered that the longer the period of a Cepheid Variable star, the greater it’s ________ was.
Absolute magnitude
Even though absolute magnitude are usually not calculated for objects other than stars, what would be a good estimate for the moons absolute magnitude?
A very large positive number
A certain star has an absolute magnitude of 4. With only this known, what else can you determine about the star?
None of the above!
Why can’t Triangulation be used to determine the distance to all stars?
Some stars have parallaxes which are too small to measure
Who was the 1st to discover the other galaxies existed?
Hubble
Who developed the “Stellar Spectral Sequence”?
Cannon
The 1st Cepheid Variable star was found in the constellation of
Cepheus
What is the spectral type of the sun?
G2
What color would a G4 spectral type star be?
Yellow-ish
What color would a M2 spectral type star be?
Red-ish
The Ozone layer in the Earth’s atmosphere mainly protects us from?
Ultraviolet
What spectral type star has the highest surface temperature?
B5
Who first realized that the “Stellar Spectral Sequence” represented the temperature of stars
Cecilia Payne
Which star would be least common in the universe?
8.9 Mo
Which star should be the most common in the universe?
1.3 Mo
Assume you were to see the number/words “22 kilograms” and “50 pounds” printed on the same weight in the gym on earth. Now assume you take that weight to the Moon, where the gravity is only 1/6 of earths Gravity. To be accurate what number/word should be removed from the weight?
50 Pounds
The most prominent Greenhouse gasses in our atmosphere are water vapor and ?
Carbon dioxide
If the star Alpha Centauri A, which is a G2 spectral type star, were 1 au away from us, what would it’s approximate apparent magnitude be?
-26.5
What would be the distance from earth to a star if its:
Apparent magnitude is three and it’s absolute magnitude is three?
10 parsecs
