CB 230
| CB 230 / L1177 | |
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| Image taken with a 32-inch reflector (Adam Block / Mount Lemmon SkyCenter / University of Arizona) |
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Observation dates equinox : J2000.0 |
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| Constellation | Cepheus |
| Right ascension | 21 h 17.6 m |
| declination | + 68 ° 18 ′ 0 ″ |
| Catalog names | |
| L1177, CB 230 | |
CB 230 , also known as L1177 or as part of it, is a molecular cloud in the western section of the constellation Cepheus . It belongs to the Cepheus Flare region , a large complex of molecular clouds in the Milky Way. At its eastern edge, the cloud contains a globule with several infrared sources, which are protostars , and an associated jet . The removal of the structure is uncertain; Estimates vary between around 250 and 550 parsecs .
The designation CB 230 goes back to a catalog by Dan P. Clemens and Richard Barvainis from 1988.
Globule with protostars
It has been the subject of several investigations in different wavelength ranges and is considered an interesting example of the formation of stars. Two protostars were discovered inside the globule by Joao L. Yun and published in 1996. The two infrared sources are separated by about 10 ″ (projected a few thousand AU ). The more prominent western object shows a jet emanating from it and a stream of molecules, and the mass ejected by the young stellar object has created a cavity in the globule. Further observations of the eastern source gave strong indications that this is a double system, which could possibly result in a triple system overall.
Further components and surroundings of the molecular cloud
A bright region of the molecular cloud connects to the globule, which contains a star which, due to its nebulous appearance, was cataloged by Sidney van den Bergh in 1966 as the reflection nebula vdB 141 . Further to the west, column-like structures can be found whose appearance is reminiscent of ghosts. Because of these formations, the nebula is occasionally given names such as “Spooky Nebula”, “The Ghosts of Cepheus” or similar.
literature
- Joao L. Yun: Discovery of New Wide Binary Infrared Protostars . In: Astronomical Journal , Volume 111, 1996, p. 930, bibcode : 1996AJ .... 111..930Y
- M. Kun et al .: Pre-main-sequence stars in the Cepheus flare region . In: Astrophys. J. , Suppl. Ser., 185, 2009, pp. 451-476, bibcode : 2009ApJS..185..451K
- F. Massi et al .: The low-mass YSO CB230-A: investigating the protostar and its jet with NIR spectroscopy and Spitzer observations . In: Astronomy and Astrophysics , Volume 490, Issue 3, 2008, pp. 1079-1091, bibcode : 2008A & A ... 490.1079M
- R. Launhardt et al .: The Earliest Phases of Star Formation (EPoS): a Herschel key project. The thermal structure of low-mass molecular cloud cores . In: Astronomy & Astrophysics , Volume 551, 2013, A98, bibcode : 2013A & A ... 551A..98L
- J. Tobin et al .: VLA and CARMA Observations of Protostars in the Cepheus Clouds: Sub-arcsecond Proto-Binaries Formed via Disk Fragmentation . In: The Astrophysical Journal , Volume 779, Issue 2, 2013, bibcode : 2013ApJ ... 779 ... 93T
Individual evidence
- ↑ a b SIMBAD entry (accessed on December 13, 2014)
- ↑ Dan P.Clemens, Richard Barvainis: A catalog of small, optically selected molecular clouds - Optical, infrared, and millimeter properties . In: Astrophysical Journal Supplement Series , Volume 68, 1988, pp. 257-286, bibcode : 1988ApJS ... 68..257C
- ↑ Sidney van den Bergh: A study of reflection nebulae . In: Astronomical Journal , Vol. 71, 1966, pp. 990-998, bibcode : 1966AJ ..... 71..990V
- ^ Astronomy Picture of the Day . NASA, October 31, 2006
- ↑ SH2-136 . ( Memento of the original from November 4, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. UASience; Retrieved December 7, 2014
