Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astro.louisville.edu/shared_skies/archive/select/ic/ic348/20121109/ic348_wikipedia_20130415.pdf Дата изменения: Tue Apr 16 00:39:27 2013 Дата индексирования: Thu Feb 27 22:14:41 2014 Кодировка: Поисковые слова: annular solar eclipse

IC 348

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IC 348
IC 348

Hubble image of IC 348 and its surroundings.[1] Observation data Constellation Right ascension Declination Distance Perseus 03h 44m 34s[] +32° 09.8[] 1,028 ly (315 pc)[]

Apparent magnitude (V) 7.3[] Physical characteristics Estimated age Other designations 2 million years C 0341+321, Collinder 41

See also: Open cluster, List of open clusters

IC 348 is a star forming region in the constellation Perseus located about 315 parsecs from the Sun. It consists of nebulosity and an associated 2 million year old cluster of roughly 400 stars within an angular diameter of 20. The most massive stars in the cluster are the binary star system BD+31°643, which has a combined spectral class of B5.[] Based upon infrared observations using the Spitzer Space Telescope, about half of the stars in the cluster have a circumstellar disk, of which 60% are thick or primordial disks.[] The age of this cluster has allowed three low mass brown dwarfs to be discovered. These objects lose heat as they age, so they are more readily discovered while they are still young.[]

References External links
· Amateur photography (http://www.photonhunter.at/IC348.html)


Article Sources and Contributors

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Article Sources and Contributors
IC 348 Source: http://en.wikipedia.org/w/index.php?oldid=549545123 Contributors: Jmencisom, PatrickHochleitner, RJHall

Image Sources, Licenses and Contributors
File:Hubble image of LRLL 54361 and its surroundings.tif Source: http://en.wikipedia.org/w/index.php?title=File:Hubble_image_of_LRLL_54361_and_its_surroundings.tif License: Public domain Contributors: Jmencisom

License
Creative Commons Attribution-Share Alike 3.0 Unported //creativecommons.org/licenses/by-sa/3.0/