Red dwarfs are very interesting
Would you like to know more about them
Here’s a list of 24 facts about red dwarfs
FACT#1
Red dwarfs are the most common star types in the Milkyway galaxy, infarct about 75% of stars in the Milkyway are red dwarfs
FACT#2
As a big star dies in a supernova explosion, heavier metals come out from this explosion, which can form red dwarfs, this why they are so common
FACT#3
Observing them is not easy because of their low luminosity
FACT#4
None of them is visible by the naked eye, from earth
FACT#5
The coolest red dwarf
have a surface temperature of about 2000
kelvins
FACT#6
the smallest one have a radius of about 9% of that of the sun
FACT#7
they are very low mass stars, because of which they have low pressure in their core, hence a low fusion rate, which in turn gives them a low surface temperature
FACT#8
even the larges red dwarf has a luminosity of about 10% of the sun
FACT#9
if their mass is less than 0.35 times the mass of the sun, the main mechanism of transfer of
energy from the core to the surface is by convection
FACT#10
if the mass exceeds 0.35 solar masses, there will be a region in the star's core where convection will not take place
FACT#11
because convection is the main source of energy transfer, the energy transferred by radiation is reduced, so these stars can have a very long lifetime
FACT#12
some red dwarfs can have a life even longer than the present age of the universe
FACT#13
lesser the mass of a red dwarf, longer the lifetime
FACT#14
red dwarfs of mass 0.1 solar masses can burn up to 10 trillion years
FACT#15
if their mass is more than 0.25 solar masses, they will become a red giant
FACT#16
if their mass is less than 0.25 solar masses, as they age, their surface temperature increases, they shine more brightly and become a blue dwarf, and later a white dwarf
FACT#17
a red dwarf of 0.16 solar masses will be a red dwarf for 2.5 trillion years and then shine as a blue dwarf for another 5 billion years
FACT#18
they can be used to find a lower limit to the age of the universe
FACT#19
all red dwarfs contain elements heavier than helium and hydrogen
FACT#20
if we consider the
amount of metal present in red dwarfs, the lightest one will have a mass of 0.07 solar masses
FACT#21
if a red dwarf has no metal (metallicity = 0), it's minimum mass will be 0.09 solar masses
FACT#22
there are only 1 out of 40 chance that a Jupiter sized planet orbits these stars
FACT#23
liquid water can exist in the habitable zone of these stars
FACT#24
the planets in the habitable zone are very close to the star, so they will be tidally locked, meaning only one side will be facing the star continuously
Conclusion-
This was my list of 24 facts about red dwarfs
Did you found it interesting? (also see: 41 facts about neutron stars (most interesting ones) )
Would you like to add any other fact to the list
Comment and let me know
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