The similar names white dwarf, red dwarf, and brown dwarf...

Name: Problem 61, Chapter 20: Universe
Uploaded: 2020-07-15T18:01:31-08:00
Duration: 2 min 33 s
Channel: Sarah Mccrumb
Description: The similar names white dwarf, red dwarf, and brown dwarf describe three very different kinds of objects. Suggest better names for these three kinds of objects, and describe how your names more accurately describe the objects' properties.

The similar names white dwarf, red dwarf, and brown dwarf describe three very different kinds of objects. Suggest better names for these three kinds of objects, and describe how your names more accurately describe the objects' properties.

Key Concepts

Substellar Objects

This concept involves objects that do not have enough mass to sustain stable hydrogen fusion in their cores. Originally called 'brown dwarfs,' these bodies occupy the mass gap between true stars and giant planets. Referring to them as 'substellar objects' or 'failed stars' underscores the fact that, while they form in a similar manner to stars, their insufficient mass prevents them from becoming fully functioning stars, thereby accurately reflecting their unique physical and evolutionary nature.

Degenerate Stellar Remnants

This concept concerns objects that are not living, active stars but the compact, cooling cores left behind after a star has exhausted its nuclear fuel. Such objects, commonly known as white dwarfs, are primarily supported by electron degeneracy pressure rather than thermal pressure from fusion. Renaming them as 'degenerate remnants' or a similar term highlights their origin as the end product of stellar evolution and distinguishes them from living stars.

Low-Mass Hydrogen-Fusing Stars

This concept refers to stars that are small, cool, and still actively fusing hydrogen in their cores. Although the term 'red dwarf' is often used, it can be misleading when compared with other objects bearing the 'dwarf' label. Describing them as 'low-mass hydrogen-fusing stars' better emphasizes their ongoing nuclear fusion process and physical characteristics like low luminosity and surface temperature, making it clear that they are bona fide stars despite their small size.

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