Procyon A

By: Prateek Kasliwal

Words you may not know

Kelvin (K)- Kelvin is a temperature scale used a lot in astronomy. You probably know Celsius and Fahrenheit. Then why do we have to use another scale? Temperatures in space are often much colder or hotter than on Earth. Stars can have a temperature of a thousand degrees or more. The Kelvin scale is good to use for really hot and cold places in space. There aren't any negative numbers in the scale which makes it good when using cold temperatures.


Luminosity- is the total amount of energy emitted by a star, galaxy or astronomical object per unit time.


Absolute Magnitude- the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs. One parsec is equal too 3.26 light years.


Apparent Magnitude- the magnitude of a celestial object as it is actually measured from Earth.


Solar Mass- it is the mass of the sun used as a unit of mass.


Gyr- it is an abbreviation for gigayear (i.e 109 years or a billion years)

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Name

The name of the star is Procyon A. The name Procyon comes from a Greek word meaning "before the dog". It is also the name of the genus that raccoon's belong to. The star is often referred to as the "Little Dog Star" because it comes into the sky shortly before Sirius (Dog Star), which is the brightest star in the sky.

Temperature

Temperature: 6530 K

Color

Yellow-White
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Luminosity

Luminosity: 6.93

Absolute Magnitude

Absolute Magnitude: 2.68

Apparent Magnitude

Apparent Magnitude: 0.4

Size

Mass: 1.42 solar masses
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Distance from Earth

11.4 light years

Spectral Classification

F5 IV-V

Age and Stellar Evolution Stage

Age: 1.7 gyr


Evolution Stage: Procyon A is a main sequence star just beginning its evolution off the main sequence and is often designated as belonging to evolutionary class IV-V to indicate its borderline status between dwarf and sub giant stages.

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Fun Facts

  • Eight brightest star in the night sky
  • Procyon A is actually a double star consisting of Procyon A and a tiny, white dwarf Procyon B.
  • The closet star to Procyon A is Luyten's Star.

Recap on Procyon A

Procyon A

Bibliography

http://astro.berkeley.edu/~dperley/procyon.html


  • Spectral Type
  • Evolution Stage
  • Age
  • Both fun facts



http://www.windows2universe.org/physical_science/physics/thermal/kelvin_scale_used_for_astronomy.html


  • Why Kelvin scale is used and definiton



images.google.com


  • Pictures



http://astropixels.com/stars/Procyon-01.html


  • Absolute Magnitude
  • Apparent Magnitude
  • Luminosity
  • Distance from Earth
  • Temperature