The Star Zeta Pegasi (In the Constellation Pegasus,the Flying Horse)has

question 274

Multiple Choice

The star zeta Pegasi (in the constellation Pegasus,the Flying Horse) has a spectral luminosity class of B8 V,which gives it a surface temperature of about 11,000 K.According to Table 11-2 of Comins,Discovering the Essential Universe,6th ed.,the expected main-sequence lifetime of zeta Pegasi is:

• A) much greater than 500 million years.
• B) about 500 million years.
• C) not defined by this information.
• D) about 500,000 years.