Stars and stellar evolution

Doppler effect shifts the wavelengths of the stars moving away from us-

• towards the redder domain

• Towards the bluer domain

Extremely hot stars do not produce absorption spectra

• True

• False

Stars with low luminosity generally have a lower effective temperature

• True

• False

Which stars are called zero-age stars?

• Red Giants

• Blue Giants

• White dwarfs

• Main sequence stars

The luminosity of two stars at the same temperature is proportional to

• Chemical composition

• Radius

• Radius squared

• Distance from earth

As we move left to right along the HR diagram effective temperature decreases

• True

• False

How many spectral subclasses are there?

• 58

• 92

• 70

• 60

Subsolar ZAMS stars die younger

• True

• False

Older stars in a galaxy

• are called pop II stars

• are called pop I stars

• contain much more heavier elements outside the core than younger stars

• contain much less heavier elements outside the core than younger stars

CN cycle following stars are generally found in the HR diagram

• in the upper part of the main sequence

• in the lower part of the main sequence

• near the giants and below the supergiants

• near the white dwarfs