The Spectrum of a Very Distant Source Shows Spectral Absorption

question 166

Multiple Choice

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

• A) The source 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 source must have a very hot atmosphere containing helium gas overlying a much cooler stellar surface.
• C) The source 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.

---

Definitions:

Euphemisms

Expressions that convey an idea in less harsh language.

Jargon

Specialized language used by a particular profession or group that may be difficult for others to understand.

Audience's Level

The degree of understanding, interest, or knowledge that the intended audience has regarding a particular subject or topic.

Familiarity

A level of knowledge or recognition of something or someone, often leading to a sense of comfort or ease.