Spark
Loading...

Object Cards for the 13 Officially Listed Targets

← Builds on Merger Features: Tidal Tails, Bridges, and Interaction Evidence

Terms you will need

  • stellar classificationStellar classification is a way to sort stars based on the colors and patterns in their light, which tells us about their temperature and other traits.
  • spectral featuresSpectral features are the unique patterns of light and dark lines in a star's spectrum that show what elements are present and their amounts.
  • chemical compositionChemical composition refers to the types and amounts of elements that make up a star, determined by looking at its light spectrum.
  • luminosityLuminosity is how much light a star gives off, which depends on its size and temperature.
  • blackbody radiationBlackbody radiation is the light emitted by an object that depends only on its temperature, not its material.
  • spectroscopySpectroscopy is a method to study the light from stars and other objects to learn about their composition, temperature, and motion.

How this topic runs

  1. 1Start here
  2. 2How it works
  3. 3At competition depth

These cards provide a structured way to classify and analyze stars and other astronomical bodies based on their spectral features, temperature, and luminosity. By categorizing stars into specific classes, astronomers can determine their physical properties and evolutionary stages. Understanding these classifications helps scientists interpret observations and make predictions about the behavior of stars and their life cycles.

Figures (7)

Opacity of the Earth's atmosphere for different wavelengths of electromagnetic radiation. The atmosphere blocks some wavelengths but it is mostly transparent for visible light and a wide range of radio waves.
Black body curves for various temperatures.
Redshift and blueshift
The Star-Spectroscope of the Lick Observatory in 1898. Designed by James Keeler and constructed by John Brashear.
With a blazed grating, incident light is separated into several diffraction orders which separate different wavelengths apart (red and blue lines), excepting the 0-th order (black).
Two stars of different size orbiting the center of mass. The spectrum can be seen to split depending on the position and velocity of the stars.
Optical spectrum of Comet Hyakutake.

Object cards for the 13 officially listed targets are tools used in astronomy to classify and analyze stars and other celestial objects. These cards help scientists understand the physical properties of stars by looking at their spectral features, temperature, and brightness. The classification system is based on the light stars emit, which is split into a spectrum showing colors and lines that reveal the elements present in the star.

The classification system uses letters like O, B, A, F, G, K, and M to represent different types of stars, with O being the hottest and M the coolest. Each letter is further divided into numbers from 0 to 9, where 0 is the hottest in that category. The system also includes Roman numerals to show if a star is a giant, dwarf, or another type based on its size and brightness.

In addition to the main types, there are special categories for stars that don't fit neatly into the standard system, such as brown dwarfs and white dwarfs. Understanding these classifications is important because it allows scientists to make predictions about how stars will behave and evolve over time.

Key Points

  • Stellar classification is the classification of stars based on their spectral characteristics.
  • Spectral features are the absorption and emission lines in a star's spectrum that indicate particular chemical elements or molecules and their abundances.
  • Chemical composition refers to the abundance of different elements or molecules in a star, as indicated by the strengths of spectral lines in its spectrum.
  • Luminosity is a measure of the electromagnetic energy output of a star in a given amount of time, related to its temperature and radius.
  • Blackbody radiation is the electromagnetic radiation emitted by a material that emits at all wavelengths, with its peak emission wavelength related to its temperature by Wien's Law.
  • Spectroscopy is the study of astronomy using techniques to measure the spectrum of electromagnetic radiation from stars and other celestial objects to determine their properties.

Terms

Tap a term for a plain-language explanation.

Sources & licensing(4)