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Westerhout 40

W 40 (. [1]

44 relations: Carbon monoxide, Chandra X-ray Observatory, Circumstellar disk, Epoch (astronomy), European Space Agency, Exoplanet, Extinction (astronomy), Galactic plane, H II region, Herbig Ae/Be star, Herschel Space Observatory, Hydrogen, Infrared astronomy, Infrared dark cloud, Interstellar medium, Ionizing radiation, IRAM 30m telescope, Jeans instability, Karl G. Jansky Very Large Array, Light-year, List of star-forming regions in the Local Group, Mass segregation, Metre per second, Milky Way, Molecular cloud, Myr, O-type star, Open cluster, Parsec, Pre-main-sequence star, Radio astronomy, RCW Catalogue, Serpens, Serpens south, Serpens-Aquila Rift, Sharpless catalog, Shock wave, Smoothed-particle hydrodynamics, Solar mass, Spitzer Space Telescope, Star formation, Stellar classification, Stratospheric Observatory for Infrared Astronomy, Visible-light astronomy.

Carbon monoxide

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air.

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Chandra X-ray Observatory

The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a space observatory launched on STS-93 by NASA on July 23, 1999.

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Circumstellar disk

A circumstellar disk is a torus, pancake or ring-shaped accumulation of matter composed of gas, dust, planetesimals, asteroids or collision fragments in orbit around a star.

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Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.

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European Space Agency

The European Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation dedicated to the exploration of space, with 22 member states.

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Exoplanet

An exoplanet or extrasolar planet is a planet that orbits a star other than the Sun.

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Extinction (astronomy)

Extinction is a term used in astronomy to describe the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.

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Galactic plane

The galactic plane is the plane in which the majority of a disk-shaped galaxy's mass lies.

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H II region

An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place.

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Herbig Ae/Be star

A Herbig Ae/Be star (HABe) is a pre-main-sequence star – a young (V. Mannings & A. Sargent (2000) High-resolution studies of gas and dust around young intermediate-mass stars: II. observations of an additional sample of Herbig Ae/Be systems. Astrophysical Journal, vol. 529, p. 391 Hydrogen and calcium emission lines are observed in their spectra. They are 2-8 Solar mass objects, still existing in the star formation (gravitational contraction) stage and approaching the main sequence (i.e. they are not burning hydrogen in their center). In the Hertzsprung–Russell diagram these stars are located to the right of the main sequence. They are named after the American astronomer George Herbig, who first distinguished them from other stars in 1960. The original Herbig criteria were.

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Herschel Space Observatory

The Herschel Space Observatory was a space observatory built and operated by the European Space Agency (ESA).

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Hydrogen

Hydrogen is a chemical element with chemical symbol H and atomic number 1.

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Infrared astronomy

Infrared astronomy is the branch of astronomy and astrophysics that studies astronomical objects visible in infrared (IR) radiation.

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Infrared dark cloud

An infrared dark cloud (IRDC) is a cold, dense region of a giant molecular cloud.

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Interstellar medium

In astronomy, the interstellar medium (ISM) is the matter that exists in the space between the star systems in a galaxy.

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Ionizing radiation

Ionizing (or ionising in British English) radiation is radiation that carries enough energy to free electrons from atoms or molecules, thereby ionizing them.

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IRAM 30m telescope

The IRAM 30m millimeter radio telescope is a radio telescope for astronomical observations in the millimeter range of wavelengths, operated by the Institute for Radio Astronomy in the Millimeter Range (IRAM)) and located on the Sierra Nevada, in Spain, close to the Pico Veleta peak. It is the largest millimeter-wave telescope in the world after the Large Millimeter Telescope. Each year more than 200 scientists from all over the world visit this observatory to explore the universe at millimeter wavelengths, with interests going from our Solar System to interstellar dust and gas or cosmology.

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Jeans instability

In physics, the Jeans instability causes the collapse of interstellar gas clouds and subsequent star formation.

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Karl G. Jansky Very Large Array

The Karl G. Jansky Very Large Array (VLA) is a radio astronomy observatory located on the Plains of San Agustin, between the towns of Magdalena and Datil, some 50 miles (80 km) west of Socorro, New Mexico.

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Light-year

A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.

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List of star-forming regions in the Local Group

This is a list of star-forming regions located in the Milky Way Galaxy and in the Local Group.

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Mass segregation

In astronomy, dynamical mass segregation is the process by which heavier members of a gravitationally bound system, such as a star cluster or cluster of galaxies, tend to move toward the center, while lighter members tend to move farther away from the center.

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Metre per second

Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds.

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Milky Way

The Milky Way is the galaxy that contains our Solar System.

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Molecular cloud

A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit the formation of molecules, most commonly molecular hydrogen (H2).

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Myr

The abbreviation myr refers to a unit of time equal to one million years.

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O-type star

An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers.

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Open cluster

An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.

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Parsec

A parsec (symbol: pc) is a unit of length used to measure the astronomically large distances to objects outside the Solar System.

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Pre-main-sequence star

A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence.

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Radio astronomy

Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies.

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RCW Catalogue

The RCW Catalogue (Rodgers, Campbell, Whiteoak) is an astronomical catalog of Hα-emission regions in the southern Milky Way, described in.

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Serpens

Serpens ("the Serpent", Greek Ὄφις) is a constellation of the northern hemisphere.

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Serpens south

The Serpens South star cluster is a relatively dense group of 50 young stars, 35 of which are protostars just beginning to form.

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Serpens-Aquila Rift

The Serpens-Aquila Rift (also known as the Aquila Rift) is a region of the sky in the constellations Aquila, Serpens Cauda, and eastern Ophiuchus containing dark interstellar clouds.

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Sharpless catalog

The Sharpless catalog is a list of 313 HII regions (emission nebulae), intended to be comprehensive north of declination -27°.

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Shock wave

A shock wave is a type of propagating disturbance.

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Smoothed-particle hydrodynamics

Smoothed-particle hydrodynamics (SPH) is a computational method used for simulating fluid flows.

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Solar mass

The solar mass is a standard unit of mass in astronomy that is used to indicate the masses of other stars, as well as clusters, nebulae and galaxies.

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Spitzer Space Telescope

The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003.

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Star formation

Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse to form stars.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Stratospheric Observatory for Infrared Astronomy

The Stratospheric Observatory for Infrared Astronomy (SOFIA) is a joint project of NASA and the German Aerospace Center (DLR) to construct and maintain an airborne observatory.

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Visible-light astronomy

Visible-light astronomy encompasses a wide variety of observations via telescopes that are sensitive in the range of visible light (optical telescopes).

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References

[1] https://en.wikipedia.org/wiki/Westerhout_40

 

Aquila Molecular Cloud, Sh2-64, W 40.

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