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Absorption Line

Astronomy  Absorption band  Absorption Spectrum

Absorption Line
An absorption line will appear in a spectrum if an absorbing material is placed between a source and the observer. This material could be the outer layers of a star, a cloud of interstellar gas or a cloud of dust.


absorption line: a more or less narrow range of wavelengths in a spectrum that is darker than neighboring wavelengths. Absorption lines are seen in stars.

absorption line
A dark line in a spectrum that represents the absorption of energy at a particular wavelength of light. Each element on the periodic table absorbs energy at unique wavelengths.

absorption line: A dark line in a spectrum; produced by the absence of photons absorbed by atoms or molecules.
absorption spectrum (dark-line spectrum): A spectrum that contains absorption lines.

absorption line spectrum
Dark lines superimposed on a continuous spectrum.
acceleration
The rate at which an object's velocity changes due to a change in speed, a change in direction, or both.

absorption line
A narrow dark line within a spectrum. It is caused by specific gases absorbing a portion of radiation, and its width represents the relative abundance of the gases.

Absorption line: A dark line or band at a particular wavelength on a spectrum, formed when a substance between a radiating source and an observer absorbs electromagnetic radiation of that wavelength.

Absorption line. A break of depression in a continuous spectrum caused by the absorption of photons within narrow wavelengths by some types of atom, ion, or molecule.

Absorption Line - A dark line superimposed on a continuous spectrum when a gas absorbs light from a continuous source that is hotter than the absorbing gas ...

ABSORPTION LINES
When sunlight is split by a prism, at first glance it appears to produce a continuous spectrum.

ABSORPTION LINE - Narrow range of wavelengths in a spectrum that are darker (have lower intensity) than neighboring wavelengths.

Absorption lines Dark lines interrupting a continuous color spectrum, caused by a cool gas between the light source and the observer. Cool gas absorbs light in the same frequencies as it emits when hot, e.g. double yellow line of sodium.

Absorption Lines
Dark lines in a spectrum, produced when light or other electromagnetic radiation coming from a distant source passes through a gas cloud or similar object closer to the observer.

An absorption line is produced when a photon of just the right energy is absorbed by an atom, kicking an electron to a higher energy orbit. The photon had energy = the difference in energy of the energy orbits.

Absorption lines of KrI
No Kr line is seen in the solar spectrum.
Absorption lines of KrII
Following Bidelman's (1960) discovery of KrII in 3 Cen A, this element was observed in some other hot Bp stars. W(4355) = 0.025 according to Hardorp (1966).

Absorption Line
A dark line in a continuous spectrum caused by absorption of light.

Absorption lines
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from an excess or deficiency of photons in a narrow frequency range, compared with the nearby frequencies.
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Absorption Lines: Dark lines superimposed over a bright continuous spectrum background, created when a cooler gas absorbs photons from a hotter source.

Absorption lines against a continuous spectrum are seen as the photons emitted at particular wavelengths are emitted in all directions, so would produce a dark line.

absorption line
In spectroscopy, and in particular the solar Fraunhofer spectrum, a characteristic wavelength of emitted radiation that is partially absorbed by the medium between the source and the observer.
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absorption lines
Narrow spectral features that represent a reduction in intensity over a small wavelength range. They are caused by the loss of photons that raise an atom from a particular energy state to a higher energy state.
absorption spectrum ...

ABSORPTION LINES
Absorption Lines are dark lines superimposed over a bright continuous absorption spectrum. Each dark line is formed as a cooler gas absorbs photons emitted by a particular element from a hotter source.

The absorption line of neutral calcium at 4227 Angstroms is thus strong in cool M-type dwarf stars, in which the pressure is high and the temperature is low.

The absorption lines of a solar or other stellar spectrum.
frequency - (n.) ...

Dark absorption lines in the sun's spectrum and that of other stars are called Fraunhofer lines after Joseph von Fraunhofer (1787-1826) who observed them in 1817.

Broad absorption lines are direct evidence of outflow from AGNs, at very respectable velocities.

Emission and absorption lines in radio astronomy usually originate from atoms and small molecules or molecular ions in gaseous form, and molecular transitions at radio wavelengths are usually rotational.

Search for absorption lines from the evaporated atmosphere of extrasolar planets in the visible.
April 7, 2007 COUSTENIS A., MAYOR M., SCHNEIDER J., QUELOZ D. & EGGENBERGER A.
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Relatively few absorption lines. Lines of ionized helium and other lines of highly ionized atoms. Hydrogen lines appear only weakly. Peak of light in UV part of spectrum.
Naos
B ...

absorption line (NASA SP-7, 1965) A minute range of wavelength (or frequency) in the electromagnetic spectrum within which radiant energy is absorbed by the medium through which it is passing.

absorption line The absence or reduction of radiation at one or several adjacent wavelengths in a continuous spectrum.

A certain absorption line that is found at 5000 Angstroms in the lab is found at 5050 Angstroms when analyzing the spectrum of a particular galaxy.

H-alpha. This absorption line of neutral hydrogen falls in the red part of the visible spectrum and is convenient for solar observations. The H-alpha line is universally used for observations of solar flares.

telluric lines Absorption lines in a solar spectrum produced by constituents of the atmosphere of the earth itself rather than by gases in the outer solar atmosphere such as those responsible for the Fraunhofer lines.

Ganzy (5) said:

Can someone correct me please if I'm wrong, but if I were to analyze the entire spectrum of light that is being given off by this cargo ship burning up on re-entry, would I expect to see black absorption lines in specific ...

The reason temperatures affect absorption lines is not too difficult to understand in a general way.

Asymmetric absorption line profiles are the result of the superposition of multiple absorption lines, each corresponding to the same atomic transition (for example the "K" line of calcium), ...

Now, when you take the spectrum of a star, you find that superimposed on the blackbody curve are several small peaks and dips, which are known as emission and absorption lines.

A second candidate was identified by methane absorption lines in Gliese 229B, a faint object orbiting the M1 star Gliese 229 in the constellation Lepus, 18.6 light years away.

Most prominent would be the star itself, and whatever emission and absorption lines come from the star's surface. But what about the gas?

This detection helps explain the physical shape of previously poorly-understood related ice absorption lines.
Orton et al.

Within this spectra, astronomers can study emission and absorption lines which are the fingerprints of atoms and molecules. An emission line occurs when an electron drops down to a lower orbit around the nucleus of an atom and loses energy.

These locations are called absorption lines and are caused by a particular element in the star's atmosphere.

A dark-line spectrum (also called a absorption spectrum) consists of dark absorption lines superimposed on a bright continuous spectrum.

HST did not detect any absorption lines that would he produced by stars in the nucleus, therefore stellar processes are not responsible for light emitted by the nucleus.

Even in stars of the same spectral type, the absorption lines don't always look alike. In some stars the lines are narrow and sharp; in others they are broadened by various effects.

Definition: Balmer lines (J. Balmer): Emission or absorption lines in the spectrum of hydrogen that arise from transitions between the second (or first excited) state and higher energy states of the hydrogen atom.

Gamma Velorum also has the nickname the Spectral Gem of the Southern Skies because it emits bright lines instead of dark absorption lines, which results in an exotic looking spectrum.

B stars have spectra that are characterized by absorption lines of neutral helium which reach their maximum intensity at B2, and strong Balmer lines of hydrogen and lines of singly ionized oxygen and other gases.

Fraunhofer line - An absorption line in the spectrum of the sun or a star.
Fraunhofer spectrum - The array of absorption lines in the spectrum of the sun or of a star.

He assigned letters to the black absorption lines in the Solar Spectrum. These resonance lines arise from energy absorption by elements in the outer atmospheres of stars that are cooler than the stellar gases below. Back to Top
- G - ...

Johannes Franz Hartmann (1865-1936) was a German astrophysicist who, in 1904, discovered clouds of interstellar calcium gas (he detected the absorption lines of ionized calcium atoms using spectrography while studying binary stars).

- Apodis (Eta Apodis) is classified as an Am star or metallic-line star, an A-type star that is chemically peculiar and whose spectrum has strong absorption lines of some metals and deficiencies of others.

This field absorbs certain wavelengths, creating specific absorption lines in the spectrum. These are the cyclotron resonance absorption lines that allow the direct measurement of the magnetic field strength.

A hot variable star with peculiar emission and absorption lines in its spectrum.
PENROSE PROCESS
A mechanism for extracting rotational energy from a black hole.

Spectrometers are instruments that spread light out into wavelengths called "spectra," which look something like rainbow-colored bars. Using the spectra, scientists can look for and study the "emission lines" and "absorption lines" that are sort ...

It was taken from an American Observatory and shows a continuous spectrum displayed over 50 strips. Within each strip the vertical black bars are absorption lines which give information about the chemical composition of the star.

Based on the study of narrow absorption line features in the spectra of stars, the astronomer Andrew McKellar wrote: "It can be calculated that the 'rotational' temperature of interstellar space is 2 K." ...

A rainbow is a natural spectrum of visible light from the Sun. Spectra are often punctuated with emission or absorption lines, which can be examined to reveal the composition and motion of the radiating source.

Damped Lyman alpha systems or Damped Lyman alpha absorption systems) are gaseous objects detected in the spectra of quasars, with a column density larger than 1020 atoms/cm2. Their spectra consist of neutral hydrogen Lyman alpha absorption lines, ...

(Image: European Southern Observatory) Astronomers then used the VLT's 8.2-m Kueyen telescope to obtain a spectrum of the objects. This superimposed the light of the two stars, but the combined result shows the deep absorption lines expected from ...

(The higher the gravity, the more the compression of the gas, and the closer the atoms are to each other, which affects the way in which they produce their absorption lines.) The gravity in turn depends on mass and radius.

Spectra are often punctuated with emission or absorption lines, which can be examined to reveal the composition and motion of the radiating source.

See also: See also: Spectrum, Astro, Solar, Star, Sun

Astronomy  Absorption band  Absorption Spectrum

 
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