Stellar classification - Wikipedia
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.
Stellar classification | Types, Spectral Classes & Luminosity
2024年11月29日 · Stellar classification, scheme for assigning stars to types according to their temperatures as estimated from their spectra. The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature,
Star - Spectral Types, Classification, Astronomy | Britannica
2024年12月28日 · Star - Spectral Types, Classification, Astronomy: Most stars are grouped into a small number of spectral types. The Henry Draper Catalogue and the Bright Star Catalogue list spectral types from the hottest to the coolest stars (see stellar classification).
The Spectral Types of Stars - Sky & Telescope
2006年8月1日 · Appended to the basic spectral type may be letters for chemical peculiarities, an extended atmosphere, unusual surface activity, fast rotation, or other special characteristics. Every starwatcher needs to have a feel for spectral types.
Spectral Classification - Harvard University
Each spectral type is divided into 10 subclasses, A0, A1, A2, ...A9 etc. The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9).
Types of Stars - Star Facts – Stars: A guide to the night sky
In astronomy, stars are classified based on their spectra. Different types of stars (listed below) have different spectral characteristics and, even though they only differ in brightness to the unaided eye, stars are divided into seven basic spectral classes and eight luminosity classes.
Spectral Classifications
2023年12月14日 · The spectral type of a star provides valuable information about its temperature. Stars are classified using the Morgan–Keenan (MK) system, which categorizes stars into different spectral types ranging from O (hottest) to M (coolest).
Spectral Classification - Hertzsprung-Russell Diagram - NAAP
Spectra are described by Kirchoff's Laws: A hot opaque body, such as a hot, dense gas (or a solid) produces a continuous spectrum – a complete rainbow of colors. A hot, transparent gas produces an emission line spectrum – a series of bright spectral lines against a dark background.
Star Spectral Classification - HyperPhysics
Spectral characteristics offer a way to classify stars which gives information about temperature in a different way - particular absorption lines can be observed only for a certain range of temperatures because only in that range are the involved atomic energy levels populated.
Stellar Types - Astrophysics Spectator
The stellar type system is a purely empirical classification scheme that simultaneously describes both a star's photospheric temperature and luminosity in terms of the spectral characteristics of a handful of prototypical stars.