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astronomy
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest includ ...
, the Columba association is a nearby Myr
Million years ago, abbreviated as Mya, Myr (megayear) or Ma (megaannum), is a unit of time equal to (i.e. years), or approximately 31.6 teraseconds.
Usage
Myr is in common use in fields such as Earth science and cosmology. Myr is also used w ...
old stellar association.
The association is named after the constellation Columba (constellation), Columba which contains many of the stars first recognized in the group.
Special interest
Stars in young associations are a popular target for professional astronomers. The stars are often surrounded by Circumstellar disc, circumstellar disks, discs of dust and other planet forming matter around a young star, and young planets that still glow in the infrared spectrum, which makes it easier to List of directly imaged exoplanets, directly image, using the light reflected off of the planets to obtain an image of the planets. The most famous star in the Columba association is which has four directly imaged planets. The group was at first not recognized as an individual group, but stars within the group were first assigned to the Great Austral Young Association (GAYA), because it showed similar movement and distance compared with two nearby groups. Only later it became clear that GAYA is subdivided into three groups: the Tucana-Horologium association, the Carina association and the Columba association. The brightest star in the association is the massive star HD 32309, with a spectral type of B-type main-sequence star, B9Vann and an apparent magnitude of 4.90 . The association also contains several A-type main-sequence star, A-type and F-type main-sequence star, F-type stars, such as Omega Aurigae, HR 8799, 26 Geminorum and AS Columbae. It also contains several other variable stars, such as V1358 Orionis, RT Pictoris, DK Leonis, V909 Orionis and GJ 1284. The stars HD 30447 and HD 35847 are members of the group with directly imaged debris disks.
See also
* List of nearby stellar associations and moving groups * Argus Association * TW Hydrae associationFootnotes
References
{{reflist, 25em Stellar associations Columba (constellation)