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Astronomy Final > Exam #2 > Flashcards

Exam #2 Flashcards

1
Q

What would be the distance from earth to a star if its:

Apparent magnitude is too and it’s absolute magnitude is six?

A

Closer than 10 parsecs

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2
Q

What would be the distance from earth to a star if its:

Apparent magnitude is 15 and it’s absolute magnitude is 1?

A

Further than 10 parsecs

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3
Q

What would be the distance from earth to a star if its:

Apparent magnitude is 3 and absolute magnitude is -3?

A

Further than 10 parsecs

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4
Q

What spectral class star would have a peak wavelength that it emits shifted farthest towards the “red” end of the spectrum?

A

A M7 star

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5
Q

What spectral class star would have its peak wavelength that it Emirates shifted farthest towards the blue end of the spectrum?

A

A B7 star

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6
Q

Which spectral type star would email the least yellow light?

A

M5

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7
Q

Which spectral type star what emit the least blue light?

A

M5

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8
Q

Which spectral type star would emit the least red light?

A

M5

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9
Q

Which color would a B3 spectral type star be?

A

Blue-ish

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10
Q

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?

A

Star A has a greater radio velocity Than star B

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11
Q

Considering Wiens law, which star from below would have the highest surface temperature?

A

A star with peak wavelength in the “violet”

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12
Q

The Demon Star, Algol, represents the head of _________ in the constellation Perseus.

A

None

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13
Q

What is the approximate apparent magnitude of the sun?

A

-26.5

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14
Q

What is the approximate absolute magnitude of the sun?

A

5

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15
Q

Another a name for the star “Sirius” is:

A

The Dog Star

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16
Q

Every 5 magnitudes on the magnitude scale is equivalent to _______ times in brightness (light output).

A

100

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17
Q

How many known Stars are within (closer than) a parsec from the Sun?

A

0

18
Q

Approximately how many stars, in total, have parallaxes less than 1 arc second, using the stellar triangulation method (baseline of 1au)?

A

Billions

19
Q

Which star system listed has the largest parallax?

A

Alpha Centauri (4.3 ly away)

20
Q

Which star system listed has the smallest parallax?

A

Deneb (1600 ly away)

21
Q

Henrietta Leavitt’s Period-Luminosity Relation for Cepheid Variable stars allowed Edwin Hubble to determine:

A

The distance of these stars

22
Q

Henrietta Leavitt’s discovered that the longer the period of a Cepheid Variable star, the greater it’s ________ was.

A

Absolute magnitude

23
Q

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

A very large positive number

24
Q

A certain star has an absolute magnitude of 4. With only this known, what else can you determine about the star?

A

None of the above!

25
Q

Why can’t Triangulation be used to determine the distance to all stars?

A

Some stars have parallaxes which are too small to measure

26
Q

Who was the 1st to discover the other galaxies existed?

A

Hubble

27
Q

Who developed the “Stellar Spectral Sequence”?

A

Cannon

28
Q

The 1st Cepheid Variable star was found in the constellation of

A

Cepheus

29
Q

What is the spectral type of the sun?

A

G2

30
Q

What color would a G4 spectral type star be?

A

Yellow-ish

31
Q

What color would a M2 spectral type star be?

A

Red-ish

32
Q

The Ozone layer in the Earth’s atmosphere mainly protects us from?

A

Ultraviolet

33
Q

What spectral type star has the highest surface temperature?

A

B5

34
Q

Who first realized that the “Stellar Spectral Sequence” represented the temperature of stars

A

Cecilia Payne

35
Q

Which star would be least common in the universe?

A

8.9 Mo

36
Q

Which star should be the most common in the universe?

A

1.3 Mo

37
Q

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?

A

50 Pounds

38
Q

The most prominent Greenhouse gasses in our atmosphere are water vapor and ?

A

Carbon dioxide

39
Q

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?

A

-26.5

40
Q

What would be the distance from earth to a star if its:

Apparent magnitude is three and it’s absolute magnitude is three?

A

10 parsecs

Astronomy Final (4 decks)

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