Table of Contents
What are the phases of a star?
Seven Main Stages of a Star
- Giant Gas Cloud. A star originates from a large cloud of gas.
- Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced.
- T-Tauri Phase.
- Main Sequence.
- Red Giant.
- The Fusion of Heavier Elements.
- Supernovae and Planetary Nebulae.
Which of these stars has the hottest surface?
Type O stars
Type O stars have the highest surface temperatures and can be as hot as 30,000 Kelvins.
What is the initial stage of all stars?
A protostar is the earliest stage of a star’s life. A star is born when the gas and dust from a nebula become so hot that nuclear fusion starts. Once a star has “turned on” it is known as a main sequence star.
What is the second stage of a star?
Stage 2 – A region of condensing matter will begin to heat up and start to glow forming Protostars. If a protostar contains enough matter the central temperature reaches 15 million degrees centigrade. This image is the outflow (coloured red)and protostar.
What is the first stage of a star’s life cycle?
The gas in the nebula begins to glow. This is the first step in the life cycle of a star. It is called a protostar. This chemical change gives off a large amount of energy in the form of heat.
Which of these main sequence stars has the hottest core temperature?
O stars
The spectral sequence of stars runs OBAFGKM. O stars are the hottest, with temperatures from about 20,000K up to more than 100,000K. These stars have few absorption lines, generally due to helium. These stars burn out in a few million years.
Which spectral sequence are the hottest stars categorized?
O-
The spectral sequence is also a colour sequence: the O- and B-type stars are intrinsically the bluest and hottest; the M-, R-, N-, and S-type stars are the reddest and coolest.
How is a star born step by step?
Most stars are born inside great clouds of gas and dust called nebulas. The process begins when a nebula starts to shrink, then divides into smaller, swirling clumps. Each clump becomes ball-shaped, and as it continues to shrink the material in it gets hotter and hotter.