#Average main sequence star full
#Average main sequence star code

In actuality, however, stars radiate in all parts of the spectrum. The conventional colour description takes into account only the peak of the stellar spectrum.

#Average main sequence star full

The full spectral class for the Sun is then G2V, indicating a main-sequence star with a surface temperature around 5,800 K. Luminosity class 0 or Ia+ is used for hypergiants, class I for supergiants, class II for bright giants, class III for regular giants, class IV for subgiants, class V for main-sequence stars, class sd (or VI) for subdwarfs, and class D (or VII) for white dwarfs. This is based on the width of certain absorption lines in the star's spectrum, which vary with the density of the atmosphere and so distinguish giant stars from dwarfs. In the MK system, a luminosity class is added to the spectral class using Roman numerals. The sequence has been expanded with classes for other stars and star-like objects that do not fit in the classical system, such as class D for white dwarfs and classes S and C for carbon stars. Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g., A8, A9, F0, and F1 form a sequence from hotter to cooler). Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest ( O type) to the coolest ( M type).

#Average main sequence star code

The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. In astronomy, stellar classification is the classification of stars based on their spectral characteristics. JSTOR ( October 2023) ( Learn how and when to remove this template message)Ī simple chart for classifying the main star types using Harvard classification.Unsourced material may be challenged and removed.įind sources: 'Stellar classification' – news

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