Physics High School

Your friend then concludes then that if an absorption line spectrum of a star has a lot of blue lines this should indicate that the star is very hot. What can you say about your friend’s statement?

Answers

Answer 1

This statement is not entirely accurate. In reality, the presence of blue lines in an absorption line spectrum does indicate certain characteristics of a star, but it is not solely indicative of its temperature.

The absorption line spectrum of a star reveals the wavelengths at which specific elements in the star's outer layers absorb light. These lines correspond to transitions between energy levels in the atoms or ions present. The color of the lines in the spectrum depends on the specific elements and the temperature of the star. In general, hotter stars tend to exhibit more ionized elements, which can produce absorption lines in the blue or ultraviolet portion of the spectrum. Cooler stars, on the other hand, may exhibit more neutral elements, resulting in absorption lines in the red or infrared portion of the spectrum.

However, it's important to note that the overall shape and intensity of the spectrum, as well as the presence of other features, also contribute to determining a star's temperature. Therefore, solely observing the presence of blue lines in the absorption line spectrum is not sufficient to accurately determine the temperature of a star.

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