We've got 1 definition »

What does OBAFGKM stand for? 

What does OBAFGKM mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: OBAFGKM.

Filter by: Sort by:PopularityAlphabeticallyCategory
TermDefinitionRating
OBAFGKM

Oh, Be A Fine Girl, Kiss Me

Academic & Science » Astronomy

Rate it:

What does OBAFGKM mean?

obafgkm
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. 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. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. 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. The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. 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). 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). 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. In the MK system, a luminosity class is added to the spectral class using Roman numerals. 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. 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. The full spectral class for the Sun is then G2V, indicating a main-sequence star with a surface temperature around 5,800 K.

see more »

Discuss these OBAFGKM abbreviations with the community:

0 Comments

    Know what is OBAFGKM? Got another good explanation for OBAFGKM? Don't keep it to yourself!

    Still can't find the acronym definition you were looking for? Use our Power Search technology to look for more unique definitions from across the web!

    Citation

    Use the citation options below to add these abbreviations to your bibliography.

    Style:MLAChicagoAPA

    "OBAFGKM." Abbreviations.com. STANDS4 LLC, 2024. Web. 5 Mar. 2024. <https://www.abbreviations.com/OBAFGKM>.

    Browse Abbreviations.com

    Free, no signup required:

    Add to Chrome

    Get instant explanation for any acronym or abbreviation that hits you anywhere on the web!

    Free, no signup required:

    Add to Firefox

    Get instant explanation for any acronym or abbreviation that hits you anywhere on the web!

    Quiz

    The ultimate acronym test

    »
    BLE
    • A. Bluetooth Larger Enhancements
    • B. Bluetooth Low Energy
    • C. Bluetooth Larger Entropy
    • D. Bluetooth Low Entropy

    Embed

    Share an image of OBAFGKM

    »

    Hearing impaired tip:

    Sign language

    How do you say OBAFGKM in ASL sign language fingerspelling?