L1157
| Dark nebula | |
|---|---|
 | |
| Observation data: J2000 epoch | |
| Right ascension | 20h 39.5m[1] |
| Declination | +68° 00.7′[1] |
| Distance | 1,400 ly (440[1] pc) |
| Constellation | Cepheus |
L 1157 is a dark nebula in the constellation Cepheus. It was catalogued in 1962 by U.S. astronomer Beverly T. Lynds in her Catalogue of Dark Nebulae, becoming the 1157th entry in the table; hence the designation.[2] The cloud contains an estimated 3,900 Solar masses of material.[1] It includes protostars that are ejecting material in bipolar outflows, forming bow shocks in the surrounding ambient gas. Formamide and HCNO have been detected in these shocked regions, among other compounds.[3]
References
- 1 2 3 4 Kun, M.; et al. (December 2008), Reipurth, Bo, ed., "Star Forming Regions in Cepheus", Handbook of Star Forming Regions, 1, p. 136, Bibcode:2008hsf1.book..136K1
- ↑ Lynds, Beverly T. (May 1962), "Catalogue of Dark Nebulae", Astrophysical Journal Supplement, 7: 1, Bibcode:1962ApJS....7....1L, doi:10.1086/190072.
- ↑ Mendoza, Edgar; et al. (November 2014), "Molecules with a peptide link in protostellar shocks: a comprehensive study of L1157", Monthly Notices of the Royal Astronomical Society, 445 (1): 151−161, arXiv:1408.4857
, Bibcode:2014MNRAS.445..151M, doi:10.1093/mnras/stu1718.
External links
- http://jumk.de/astronomie/special-stars/l1157.shtml
- http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=L1157&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
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