Admin Table of Contents
- 1 Which of the following main sequence stars is the most luminous?
- 2 Which of the following stars is the brightest group of answer choices?
- 3 Which of the following correctly states the relationship between apparent brightness luminosity and distance of a star?
- 4 Which temperature main sequence star is the brightest?
- 5 Which star is brighter Sirius or Betelgeuse?
- 6 Which 3 stars are the most luminous?
- 7 Which star has the greatest brightness?
Which of the following main sequence stars is the most luminous?
hot blue stars
Stars on the Main Sequence that are hotter than the Sun are also larger than the Sun. So hot blue stars are more luminous (and therefore appear higher in this diagram) for two reasons: they are hotter, and hot objects are more luminous than cool objects, but they are also larger.
Which of the following stars is the brightest group of answer choices?
Sirius is the brightest star in our sky. We know that because it’s apparent magnitude is the smallest (most negative).
Which of the following is the most luminous?
Learning Objectives
| Table 1. Measuring the Characteristics of Stars | |
|---|---|
| Characteristic | Technique |
| Luminosity | Measure the apparent brightness and compensate for distance. |
| Radial velocity | Measure the Doppler shift in the spectrum. |
| Rotation | Measure the width of spectral lines. |
Which of the following correctly states the relationship between apparent brightness luminosity and distance of a star?
Which of the following correctly states the relationship between the apparent brightness, luminosity, and distance of a star? The absolute magnitude of a star is dependent upon its luminosity. A star’s absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth.
Which temperature main sequence star is the brightest?
| What’s in a Name: | |
|---|---|
| Type of Star: | Hot blue star (Spectral Class O). Surface temperature 48,000 K |
| How Far Away: | |
| How Big: | 25 times the sun’s radius |
| How Bright: | 2.6 million times brighter than the sun |
Which of the following stars is most dense?
A neutron star’s mass is often about the same as that of the sun; a sugar-cube’s worth of neutron-star material has a mass of about 100 million tons, or about the same as the entire human population, according to the statement. This makes neutron stars the universe’s densest objects besides black holes.
Which star is brighter Sirius or Betelgeuse?
While Sirius A and B are both less luminous than stars like Betelgeuse or Rigel, they’re so close to Earth that they’re the brightest star we can see, and will stay that way for 210,000 more years, though gradually you’ll only get to see them in the Southern Hemisphere.
Which 3 stars are the most luminous?
At least three stars in the constellation Canis Major are thought to be thousands of times more luminous than Sirius: Aludra, Wezen, and Omicron 2.
Which group represents stars that are hot and very bright?
The brightest stars are called supergiants. Star clusters are rich in stars just off the main sequence called red giants. Main sequence stars are called dwarfs. And the faint, hot stars are called white dwarfs.
Which star has the greatest brightness?
Sirius
Sirius, the brightest star, has an apparent magnitude of -1.46, while the faintest stars visible to the naked eye have magnitudes of about 6.