red dwarf

What spectra classification Is a red dwarf?

• A

• K

• M

• G

Red dwarfs are the coolest main-sequence stars 🌡️

• True

• False

Chemical composition of a red Dwarf

• carbon and oxygen

• hydrogen

• hydrogen 70%, helium, 28%, carbon, nitrogen and oxygen 1.5%, metals 0.5%

• hydrogen, helium, and trace amounts of lithium

a red dwarfs size Is roughly the size of Saturn to about half the diameter of the sun

• True

• False

Luminosity of a red dwarf

• 10⁰

• 10²

• 10^-4

• 10⁶

Effects on Surrounding bodies

• supernova

• high temperatures

• erosion

• extreme solar flares, high energy radiation and magnetic activity

Famous known example

• Rigel

• Proxima Centauri

• Sirius B

• Betelgeuse

How scientists analyze the star type/phase of a red dwarf

• By comparing the spin speeds of stars of different ages

•  based on how they affect their surroundings

• mass 

• measuring the temperature of the object's atmosphere