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Stars in general

Stars in general

Akshay Prasad

on 27 November 2012

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Transcript of Stars in general

By Akshay Prasad Types of Stars Introduction Dwarf Stars Giant Stars Hypergiants Supergiant
Stars Conclusion Through out the universe, scientists estimate that there are 10 sextillion and 1 septillion stars in the Universe.
Stars come in many different shapes and sizes sizes. The term dwarf star refers to a variety of distinct classes of stars. A dwarf star is a star that is not a giant or supergiant … in other words, a dwarf star is a "normal star". There are many different kinds of dwarf stars. Namely red, white, yellow and black dwarfs Two Kinds of Giant stars- Blue giants and red giants
Larger solar luminosity and a much higher solar radii
Hot luminous stars can also be reffered to as Giant Stars Most luminous Supergiants are classified as Hypergiants
Upto 70 Solar masses
30,000 to hundreds of thousands solar luminosity
30-500 solar radii, or sometimes even as much as 1000 solar radii Tremendous mass and luminosity
100-150 solar masses
40 million times as luminous then our sun
50-1100 solar radii on average
Largest known hypergiant is Canis Majoris
Short lived-Exist for only a couple million years before they explode into a supernova
4 main kinds of dwarf stars- red, white, yellow and black dwarf stars
2 kinds of Giants stars- blue and red giants
Supergiants and hypergiants are the largest stars dicovered in our universe Things you need to know Some things you might want to know to understand this presentation...
Kelvin- The kelvin is a unit of measurement for temperature. [°C] = [K] − 273.15
Solar Luminosity-This is a unit of measurement which scientists use to measure the luminosity of stars. One solar luminosity is equal to the luminosity of the sun Solar Mass- Used to show the mass of other stars, nebulae and galaxies. One Solar Mass is equal to the mass of our sun.
Solar Radius-Solar radius is a unit of distance used to express the size of stars in astronomy equal to the current radius of the Sun. More stuff you need to know William Thomson, 1st Baron Kelvin
(1824–1907) Types of Dwarf Stars White dwarf Red Dwarf Black Dwarf White Dwarfs A white dwarf is also called a degenerate star.
They are very dense
After a long time, white dwarfs will cool to temperatures where it will no longer emit heat or light and be called a black dwarf Red Dwarfs Small
Relatively cool
Can be up to half the size of the sun
Most common type of star Black Dwarf Hypothetical stellar remnant
Created when a white dwarf cools down and no longer emits heat or light
No Black Dwarfs are said to exist since the estimated ge for a white dwarf to become a black dwarf is the age of the universe (13.7 billion years) Blue Giants Exhausted the hydrogen fuel at the core
Surface temperature around 30,000 Kelvin and 10,000 solar luminosity
Expand and cool to become red giants Red Giant Temperature around 5000 Kelvin

Low or intermediate mass

Immense radius http://wpcontent.answcdn.com/wikipedia/commons/thumb/f/fe/Sun_and_VY_Canis_Majoris.svg/300px-Sun_and_VY_Canis_Majoris.svg.png http://i.ytimg.com/vi/j0zUkvs7kWM/mqdefault.jpg http://www.physics.csbsju.edu/astro/CS/images/stars.N.1.b.gif <http://en.wikipedia.org/wiki/File:Lord_Kelvin_photograph.jpg>. http://images.spaceref.com/news/extrasolar.90.jpg http://www.wolflodge.org/bluestar/h_red_dwarf_02.jpg http://www.williamsclass.com/EighthScienceWork/ImagesEighth/BlackDwarfimg.gif http://24.media.tumblr.com/tumblr_m370ayibFB1rn3wcfo1_400.jpg http://centralastronomyclass.pbworks.com/f/1237748009/redgiant.gif Yellow Dwarf Yellow Dwarf Real name is- G type main sequence star
It can have 0.8 to 1.2 solar masses
5000 to 6300 Kelvins
Sun is a Yellow Dwarf
Lifespan of approximately 10 billion years http://www.chemistrydaily.com/chemistry/upload/thumb/0/08/180px-SOHO_solar_flare_sun_large_20031026_0119_eit_304.png
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