Use the diagram to answer the question.

Question

A graph illustrates the relationship between the luminosity (Sun = 1), ranging from 0.0001 to 10000, and temperature in Kelvin, ranging from 30000 to 3000, for various stars classifications. Main sequence stars extend diagonally from the top left to the bottom right corner of the graph. The White Dwarfs, Giants, and Super Giants are placed on the graph according to their luminosity and temperature.
Which stars can be classified in spectral class A? Select all two correct answers.

(1 point)
Responses

Blue giants with a temperature of 10,000 K.
Blue giants with a temperature of 10,000 K.

Red giants with an absolute magnitude of 0.
Red giants with an absolute magnitude of 0.

White dwarfs with a luminosity around 10–2.
White dwarfs with a luminosity around 10 –2 .

Main sequence stars with a luminosity of 104.
Main sequence stars with a luminosity of 10 4 .

Red supergiants with a temperature of 4,500 K.
Red supergiants with a temperature of 4,500 K.
Remaining Attempts : 3
Skip to navigation

Answer 1

To classify stars in spectral class A, we would typically be looking for stars that have a temperature range of approximately 7,500 to 10,000 K. Let's evaluate the options given based on the general characteristics of stars:

1. Blue giants with a temperature of 10,000 K. - This option likely falls within the temperature range for spectral class A, making it a correct answer.

2. Red giants with an absolute magnitude of 0. - Red giants typically have lower temperatures (below 6,000 K) and do not belong to spectral class A. Thus, this is not a correct answer.

3. White dwarfs with a luminosity around 10–2. - White dwarfs are typically very hot (high temperature), but their luminosity is very low compared to main sequence stars. They do not fall under spectral class A, so this is not a correct answer.

4. Main sequence stars with a luminosity of 10^4. - This luminosity suggests a star that is significantly more luminous than typical spectral class A main-sequence stars (which would usually have lower luminosity than this). Thus, this is not a correct answer.

5. Red supergiants with a temperature of 4,500 K. - Red supergiants are cooler and do not fall into the range for spectral class A. Therefore, this is not a correct answer.

Based on the analysis, the correct answer is:

• Blue giants with a temperature of 10,000 K.