The Light Curve of a Cepheid Variable Star Allows Astronomers

question 3

Essay

The light curve of a Cepheid variable star allows astronomers to infer its mean brightness of 1.9 x10^-14 W/m² and the period of pulsation about 4.8 days.Utilizing the calibrated relation between period and luminosity for Classical Cepheids, its luminosity is estimated to be 8.3 x10²⁹ W.What is the distance to that Cepheid star and, implicitly, the distance to its host galaxy?

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Definitions:

Jasmonic Acid

A plant hormone involved in various plant processes, including growth, reproduction, and defense against pests and diseases.

Phototropins

A family of yellow pigments responsible for such blue light responses as the phototropic response and stomatal opening.

Light-Activated Kinases

Enzymes that become active in response to light, playing a crucial role in various biological processes, including photosynthesis and circadian rhythms.

Hypersensitive Response

A rapid and localized defense mechanism in plants that triggers cell death at the site of pathogen infection to limit its spread.