Standard-candles astronomy/Quiz

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This is a Hubble Space Telescope Image of NGC 4414. Credit: Hubble Heritage Team (AURA/STScI/NASA).

Standard-candles astronomy is a lecture about the astronomy techniques for finding and studying standard candles and standard-candle candidates. These are used to estimate distances beyond the capability of trigonometric parallax.

You are free to take this quiz based on standard-candles astronomy at any time.

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Quiz[edit]

  

1 Which of the following are attributes that make Type Ia supernovae potentially valuable standard candles?

occur in dusty regions
present in the old stellar populations of all galaxies
they have characteristic mottling
they lack hydrogen lines in their optical spectra
they lack helium lines in their optical spectra
have incipient resolution
during the first month after maximum light they do have a strong absorption feature produced by the red doublet (λ6347, λ6371 Å) of singly ionized silicon

2 True or False, Red clump giants can provide a very precise estimate of the distances to metal-rich Galactic globular clusters and nearby galaxies.

TRUE
FALSE

3 Yes or No, Novae possess a number of attributes that make them potentially valuable standard candles.

Yes
No

4 Which of the following are attributes that make novae potentially valuable standard candles?

they have characteristic mottling
they are luminous
they are easy to recognize
have incipient resolution
found predominantly in elliptical galaxies
occur in dusty regions
found predominantly in the bulges of spirals

5 Yes or No, The ideal distance indicator would be a standard candle abundant enough to provide many examples within reach of parallax measurements and sufficiently bright to be seen out to local group galaxies.

Yes
No

6 True or False, Outer spiral arms are considerably bluer due to ongoing formation of young, blue stars.

TRUE
FALSE

7 Which of the following are associated with using NGC 4414 as a standard candle?

characteristic mottling
observed on more than a dozen different occasions over the course of a few months
images obtained through at least three different color filters
incipient resolution
careful brightness measurements of variable stars
easy to recognize
large size of the galaxy

8 True or False, Stars whose distances have been accurately determined with trigonometric parallax can be used as standard candles.

TRUE
FALSE

9 Yes or No, The Hubble constant (H0) is the ratio of how fast galaxies are moving away from us to their distance from us.

Yes
No

10 True or False, In 1977, the distance to Betelgeuse estimated by various standard candles suggested 200 pc, almost universally used in the literature.

TRUE
FALSE


Hypotheses[edit]

Hypothesis:

  1. Standard candles may not be a reasonable way to estimate distances.

See also[edit]

External links[edit]