Question

question 5
the luminosity class of the star alphard is ii which means that:
o alphard is a main sequence star
o alphard has a luminosity 400 times that of the sun.
o alphard is 180 light years away.
o alphard is a bright giant.
o alphard has a surface temperature of 4400k.

Explanation:

Luminosity classes are used to classify stars based on their size and luminosity. Main - sequence stars are luminosity class V. Luminosity class II corresponds to bright giants. Luminosity class is not directly related to a specific multiple of the Sun's luminosity (like 400 times), distance (180 light - years), or surface temperature (4400K) in the way described in the options.

Answer:

Alphard is a bright giant.