Asked by Scar
Which statements are true about all white dwarfs? Select the two correct answers.
(1 point)
Responses
All white dwarfs are classified in spectral class B.
All white dwarfs are classified in spectral class B.
All white dwarfs have absolute magnitudes around 10.
All white dwarfs have absolute magnitudes around 10.
All white dwarfs have luminosities of around 10–2.
All white dwarfs have luminosities of around 10 –2 .
All white dwarfs have temperatures around 10,000 K.
All white dwarfs have temperatures around 10,000 K.
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(1 point)
Responses
All white dwarfs are classified in spectral class B.
All white dwarfs are classified in spectral class B.
All white dwarfs have absolute magnitudes around 10.
All white dwarfs have absolute magnitudes around 10.
All white dwarfs have luminosities of around 10–2.
All white dwarfs have luminosities of around 10 –2 .
All white dwarfs have temperatures around 10,000 K.
All white dwarfs have temperatures around 10,000 K.
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Answers
Answered by
Scar
How is the sun classified on an Hertzsprung-Russell Diagram?(1 point)
Responses
as a white dwarf star
as a white dwarf star
as a giant star
as a giant star
as a supergiant star
as a supergiant star
as a main sequence sta
Responses
as a white dwarf star
as a white dwarf star
as a giant star
as a giant star
as a supergiant star
as a supergiant star
as a main sequence sta
Answered by
Scar
Which of these phrases describes the sun?(1 point)
Responses
Class G yellow star
Class G yellow star
Class A white star
Class A white star
Class M red star
Class M red star
Class O blue star
Responses
Class G yellow star
Class G yellow star
Class A white star
Class A white star
Class M red star
Class M red star
Class O blue star
Answered by
Scar
Which of these properties is the best measure of a star's brightness?(1 point)
Responses
apparent magnitude
apparent magnitude
age
age
size
size
absolute magnitude
Responses
apparent magnitude
apparent magnitude
age
age
size
size
absolute magnitude
Answered by
GPT-4o mini
The two correct statements about all white dwarfs are:
1. **All white dwarfs have temperatures around 10,000 K.**
2. **All white dwarfs have luminosities of around 10⁻².**
White dwarfs typically have high surface temperatures, often in the tens of thousands of Kelvin range, and their luminosities are generally lower compared to main sequence stars, typically around 0.01 times that of the Sun (or 10⁻² times).
The other statements are not accurate:
- White dwarfs are not classified in spectral class B; they usually fall into spectral classes such as DA, DB, or other classifications based on their composition and characteristics.
- Their absolute magnitudes can vary widely, but they are often brighter than an absolute magnitude of 10.
1. **All white dwarfs have temperatures around 10,000 K.**
2. **All white dwarfs have luminosities of around 10⁻².**
White dwarfs typically have high surface temperatures, often in the tens of thousands of Kelvin range, and their luminosities are generally lower compared to main sequence stars, typically around 0.01 times that of the Sun (or 10⁻² times).
The other statements are not accurate:
- White dwarfs are not classified in spectral class B; they usually fall into spectral classes such as DA, DB, or other classifications based on their composition and characteristics.
- Their absolute magnitudes can vary widely, but they are often brighter than an absolute magnitude of 10.
Answered by
GPT-4o mini
The Sun is classified on a Hertzsprung-Russell Diagram **as a main sequence star**.
Main sequence stars are those that are in the stable phase of their lifecycle, where they fuse hydrogen into helium in their cores, which includes stars like the Sun.
Main sequence stars are those that are in the stable phase of their lifecycle, where they fuse hydrogen into helium in their cores, which includes stars like the Sun.
Answered by
GPT-4o mini
The phrase that describes the Sun is **Class G yellow star**.
The Sun is classified as a G-type main-sequence star (G dwarf), and it emits a yellowish color due to its surface temperature.
The Sun is classified as a G-type main-sequence star (G dwarf), and it emits a yellowish color due to its surface temperature.
Answered by
GPT-4o mini
The best measure of a star's brightness is **absolute magnitude**.
Absolute magnitude refers to the intrinsic brightness of a star, defined as the brightness it would have if it were located at a standard distance of 10 parsecs (about 32.6 light-years) from Earth. Apparent magnitude, on the other hand, measures how bright a star appears from Earth, which can be affected by distance and interstellar material.
Absolute magnitude refers to the intrinsic brightness of a star, defined as the brightness it would have if it were located at a standard distance of 10 parsecs (about 32.6 light-years) from Earth. Apparent magnitude, on the other hand, measures how bright a star appears from Earth, which can be affected by distance and interstellar material.