Corona Australis Molecular Cloud
The Corona Australis molecular cloud sits 130 parsecs from Earth. That distance equals roughly 430 light years. It stretches about 8 light-years across the sky between Gamma Coronae Australis and Epsilon Coronae Australis. Astronomers place this dark nebula at 18% below the galactic plane. The region covers a specific angular area on the celestial sphere. Temperatures within the gas and dust range from 13 to 22 Kelvin. A total mass of 7,000 times that of our Sun fills the complex. This makes it one of the nearest star formation regions known to us.
Over half of the complex mass concentrates in a small active zone. This core holds embedded infrared sources among the gas and dust. Scientists detected 425 distinct infrared sources near the L1688 cloud. These objects include 16 classified as protostars. They also found 123 T Tauri stars with dense circumstellar disks. Another 77 weaker T Tauri stars possess thinner disks. The last two categories show estimated ages between 100,000 and a million years. Herbig, Haro objects appear scattered throughout the surrounding area. Late stage B stars orbit the cluster center. Two confirmed brown dwarfs exist alongside seven more candidates.
Astronomers identified 55 distinct optical members within the CrA Cloud. Extinction reaches as high as 45 magnitudes at visual wavelengths. This value equals AV approximately 45 mag. The catalog lists 425 infrared sources detected near the L1688 cloud. Researchers classify these as young stellar objects. Some sources show dense circumstellar disks while others display thin ones. The data reveals a wide range of masses across the population. Protostars remain hidden deep inside the dark nebula. T Tauri stars shine brightly in the infrared spectrum. The classification helps scientists understand the early evolution of these stars.
At the heart lies the Coronet protostar cluster. It forms a loose collection of about 30 young stars. These stars hold a wide range of masses. They exist at various stages of evolution. Surrounding the cluster are several late stage B stars. Numerous Herbig, Haro objects dot the immediate vicinity. Several YSOs populate the outer regions. Embedded infrared sources appear throughout the complex. The cluster sits close to the border with Sagittarius. Two confirmed brown dwarfs anchor the lower mass end. Seven additional candidates await final confirmation by researchers.
Johann Friedrich Julius Schmidt first recorded the region in 1865. He documented the related NGC 6726 and 6727 nebulae that year. The unrelated NGC 6729 also appeared in his initial survey. Modern astronomers now map the location and boundaries of the CrA molecular cloud complex. Surveys have expanded far beyond Schmidt's original visual observations. Researchers studied the area using infrared, X-rays, radio waves, and millimeter continuum wavelengths. A star-forming region of around 7000 solar masses contains many embedded reflection nebulae. The discovery marked the beginning of detailed studies into this nearby cosmic structure.
The molecular cloud has been most widely surveyed across multiple spectral bands. Scientists analyzed data from infrared, X-ray, radio, and millimeter continuum wavelengths. These different views reveal hidden structures within the dark nebula. Infrared light penetrates the dust clouds better than visible light does. Radio waves trace the cold gas distribution throughout the region. X-ray emissions highlight high-energy processes near young stars. Millimeter continuum measurements map the density of the material. This multi-wavelength approach provides a complete picture of the star formation process. Each band offers unique insights into the physical properties of the cloud.
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Common questions
How far is the Corona Australis molecular cloud from Earth?
The Corona Australis molecular cloud sits 130 parsecs from Earth. That distance equals roughly 430 light years.
What is the total mass of the Corona Australis molecular cloud complex?
A total mass of 7,000 times that of our Sun fills the complex. This makes it one of the nearest star formation regions known to us.
When did Johann Friedrich Julius Schmidt first record the Corona Australis region?
Johann Friedrich Julius Schmidt first recorded the region in 1865. He documented the related NGC 6726 and 6727 nebulae that year.
How many infrared sources have scientists detected near the L1688 part of the Corona Australis molecular cloud?
Scientists detected 425 distinct infrared sources near the L1688 cloud. These objects include 16 classified as protostars and 123 T Tauri stars with dense circumstellar disks.
Where does the Corona Australis molecular cloud sit relative to the galactic plane?
Astronomers place this dark nebula at 18% below the galactic plane. The region covers a specific angular area on the celestial sphere between Gamma Coronae Australis and Epsilon Coronae Australis.