Protostar Facts for Kids
Type of Star
: Young Star (stellar evolution phase)
: 1 solar mass or less
: Chushiro Hayashi
: V1647 Orionis and HOPS 383
12 Protostar Facts for Kids
A protostar is a young star in the earliest stage of stellar evolution.
A protostar is also known as a YSO or young stellar object.
Astronomers can only detect protostars by infrared or microwave wavelengths.
There are 4 classes of protostars, based on their peak emissions. They are class 0, class I, class II and class III.
A protostar is a class 0 YSO (submillimeter) for about 10,000 years.
A protostar is a class I YSO (far-infrared) for about 100,000 years.
A protostar is a class II YSO (near-infrared) for about 1,000,000 years.
A protostar is a class III YSO (visible) for about 10,000,000 years.
A protostar will graduate to a main-sequence star after the core temperature gets over 10 million Kelvin. That is the temperature that hydrogen fusion operates efficiently.
It can take a protostar millions of years to complete this early stage of stellar evolution.
The time needed for a protostar to graduate to a main-sequence star depends on the mass of the star. The more mass a protostar has, the faster it will become a main-sequence star.
A brown dwarf is a failed star and results from a protostar with less than 0.08 solar mass.
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A picture of the protostar IRAS 19312+1950.
A picture of protostar Herbig-Haro 46/47.
An illustration of a protostar.
Additional Resources with Protostar Facts
- Discover more about young stars (protostars) on the Las Cumbres Observatory website.
Protostar - Wikipedia
- Find more cool protostar facts on the Wikipedia website.
The Evolution of Stars
- Learn how protostars fit into the evolution of stars.