Astronomy Scioly

Which of the following correctly ranks the given spectral types from lowest to highest temperature?

• O, B, G, K, M

• M, G, A, B, O

• G, O, A, K, M

• G, F, A, M, K

The image above depicts which of the following DSOs?

• JKCS 041

• SN UDS10Wil

• 3C 273

• M87

A visual binary is defined as a binary star system in which

• the stars, viewed from Earth, pass directly in front of each other as they orbit the system's center of mass, resulting in periodic dips in brightness

• there are Doppler shifts in the light from the system as the stars orbit their common center

• the two stars are separated enough on the sky that the two stars can be seen directly

• a star appears to orbit around an invisible companion

The only way that astronomers today can directly determine stellar masses is by

• calculating them from the stars' luminosities

• calculating them from the orbital periods of unmanned probes

• calculating them from the stars' motions around the supermassive black hole at the center of the Milky Way

• using the orbital dynamics of binary star systems

A visual binary is defined as a binary star system in which

• there are Doppler shifts in the light from the system as the stars orbit their common center

• the two stars are separated enough on the sky that the two stars can be seen directly

• the stars, viewed from Earth, pass directly in front of each other as they orbit the system's center of mass, resulting in periodic dips in brightness

Which properties are derived or calculated properties? (list in alphabetical order no space)

a. apparent magnitude

b. color

c. parallax

d. mass

e. diameter

f. intrinsic luminosity

g. distance

Which properties are observable? (list in alphabetical order and no spaces)

a. apparent magnitude

b. color

c. parallax

d. mass

e. diameter

f. intrinsic luminosity

g. distance

Which color would characterize an O star?

• red

• blue

• yellow

• green

Two stars have the same size. If Star A has a larger luminosity than Star B, then:

• the two stars have the same surface temperature

• Star B has a hotter surface temperature

• Star A has a hotter surface temperature

As viewed from Earth, a star of magnitude 2 appears ______ a star of magnitude 6.

• brighter than

• dimmer than

• similar to

Tags

NGSS.HS-PS4-3