It may be either. Juvenile means young.
The Sun is a medium mass star in main sequence.
High, typically 10 to 70 times (or more) the mass of our own sun.
Sirius B is a white dwarf. So it is low mass compared to other stellar remnants.
White dwarf stage. Its shrinks to a lot extent in this stage. Edit: A high mass star is usually one that becomes a supergiant then a supernova. Eventually this should leave either a neutron star or a black hole, depending on the mass of the star. The previous answer is for low mass stars.
A low to medium-mass star eventually evolves into a red giant as it runs out of fuel in its core. After shedding its outer layers, the star will collapse into a white dwarf, which is the end stage of its life cycle.
High mass.
High mass.
white dwarf
The Sun is a medium mass star in main sequence.
A low mass star will become a white dwarf star, eventually this will cool to become a black dwarf. A high mass star (at least 8 times the mass of our Sun) will form a neutron star or a black hole, after a supernova event.
There are more low mass stars. this is for two reasons:- # the star forming process generates more low mass stars # High mass stars burn out very quickly and explode as supernovas and thus over time there are less and less of them.
The sun is a low mass sequence star. It is classified as a G-type main-sequence star, which means it is in the middle of its stellar evolution and will remain stable for billions of years.
In a newly formed star cluster stars with low masses must greaty out number stars with high masses. High mass stars are rare and low mass stars are extremely common.
a low mass protostar is the begining formation of a low mass star. a low mass protostar is formed by a nebula (stellar nursery), like a cloud in space, where all stares come from. the definition of protostar is: a collection of gas, and dust who`s gravitational pull is causing it to collapse on itself & form a star. a LOW MASS protostar just has a LOWER MASS then a HIGH MASS protostar. Your Welcome:)
High, typically 10 to 70 times (or more) the mass of our own sun.
Vega has about 2.1 times the mass of the Sun. That's a fairly large mass; but you'll have to choose where you set the limit between "medium-mass" and "high-mass"! It is definitely not "low-mass"; in general, low-mass stars, i.e. red dwarves, can't be seen with the naked eye, even if they are in our immediate neighborhood. (The very closest star after the Sun is Proxima Centauri, and it can't be seen with the naked eye.) The main definition of a high mass star is a star that can eventually explode as a supernova. For that the star needs to be around at least 8 times the Sun's mass. I would say Vega is best thought of as "medium mass".
Sirius B is a white dwarf. So it is low mass compared to other stellar remnants.