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Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars . Classification by spectral energy distribution
A protostar is a very young star that is still gathering mass from its parent molecular cloud.It is the earliest phase in the process of stellar evolution. [1] For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years. [2]
An early estimated age for the star Beta Pictoris at about 10 million years proved problematic due to the star's apparent isolation in space. According to current theory regarding stellar evolution, extremely young stars of this age should be located near other young stars that formed from the same region in space.
The Webb Space Telescope is marking one year of cosmic photographs with one of its best yet: the dramatic close-up of dozens of stars at the moment of birth. The region is relatively small and ...
About 10 other outbursting young stars have been identified in the past, ... RELATED: Most iconic photos in space travel history: Show comments. Advertisement. Advertisement. In Other News.
A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may not be considered an accretion disk; while the two are similar, an accretion disk is hotter and spins much faster. It is also found on black holes, not stars. This ...
The stars from which HH jets are emitted are all very young stars, a few tens of thousands to about a million years old. The youngest of these are still protostars in the process of collecting from their surrounding gases. Astronomers divide these stars into classes 0, I, II and III, according to how much infrared radiation the stars emit. [28]
HL Tauri (abbreviated HL Tau) is a young T Tauri star [5] in the constellation Taurus, approximately 450 light-years (140 pc) from Earth [1] in the Taurus Molecular Cloud. [6] The luminosity and effective temperature of HL Tauri imply that its age is less than 100,000 years. [7] At apparent magnitude 15.1, [3] it is too faint to be seen with ...