The Spectrum of a Very Distant Star Shows Spectral Absorption

question 22

Multiple Choice

The spectrum of a very distant star shows spectral absorption lines of ionized helium,He II,and molecular absorption bands from titanium oxide,TiO.What could you conclude about this star?

• A) The star is probably the spectrum of a binary system, two stars close together, a hot star and a cooler companion, unresolved as separate stars from Earth but contributing separate spectra.
• B) The star must have a very hot atmosphere containing helium gas overlying a much cooler stellar surface.
• C) The star must have a thick, cool atmosphere overlying a hot stellar atmosphere.
• D) There must be cool, interstellar gas containing TiO between the star and Earth.

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