Sh2-155 (also designated Caldwell 9, Sharpless 155 or S155, or LBN529) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh2-155 is an ionized H II region with ongoing star formation activity,[1] at an estimated distance of 725 parsecs (2400 light-years) from Earth.[2][3]
Sh2-155[4] was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue,[5] being a part of the much larger Cep OB3 Association.[5] Although Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies.[6][7]
Amateur photograph of the Cave Nebula in the Hubble palette
The name "Cave Nebula" was coined for this object by Patrick Moore, presumably derived from photographic images showing a curved arc of emission nebulosity corresponding to a cave mouth.[12] The name was also used earlier to refer to another brighter but unrelated reflection nebula in Cepheus known as Ced 201[13] or VdB 152,[14][15] positioned at R.A.: 22h 13m 27s Dec.: +70° 15′ 18″ (2000). The name's application to Sh2-155 has come into vogue through the nebula's inclusion in Moore's Caldwell catalogue[16] as object Caldwell 9. (SIMBAD lists the name for Ced 201, but not for Sh2-155.)[4][13]
Referencesedit
^Getman, Konstantin V.; Feigelson, Eric D.; Townsley, Leisa; Broos, Patrick; Garmire, Gordon; Tsujimoto, Masahiro (2006). "ChandraStudy of the Cepheus B Star-forming Region: Stellar Populations and the Initial Mass Function". The Astrophysical Journal Supplement Series. 163 (2): 306–334. arXiv:astro-ph/0601405. Bibcode:2006ApJS..163..306G. doi:10.1086/501453. ISSN 0067-0049. S2CID 16305023.
^Blaauw, A.; Hiltner, W. A.; Johnson, H. L. (1959). "Photoelectric Photometry of the Association III Cephei". The Astrophysical Journal. 130: 69. Bibcode:1959ApJ...130...69B. doi:10.1086/146697. ISSN 0004-637X.
^Crawford, D. L.; Barnes, J. V. (1970). "Four-color and H-beta photometry of open clusters - VI - the association III Cep". The Astronomical Journal. 75: 952. Bibcode:1970AJ.....75..952C. doi:10.1086/111045. ISSN 0004-6256.
^Patrick Moore (1990). The Amateur Astronomer (11th ed), W.W. Norton & Company, ISBN0-393-02864-X
^Trusock, T. (11 March 2017). "The Caldwell Objects – Deep Sky Companions" (PDF).
^Panagia, N.; Thum, C. (1981). "A study of the S 155A – CEP B cloud and its relation to Cepheus OB3 association". Astronomy and Astrophysics. 92 (2): 295–299. Bibcode:1981A&A....98..295P.
^Minchin, Nigel R.; Ward-Thompson, Derek; White, Glenn J. (1992). "Carbon monoxide and far-infrared observations of the S 155-Cepheus B region". Astronomy and Astrophysics. 265 (2): 733–742. Bibcode:1992A&A...265..733M.
^"Cepheus B: Trigger-Happy Star Formation". chandra.harvard.edu. August 12, 2009. Retrieved March 12, 2017.
^Getman, Konstantin V.; Feigelson, Eric D.; Luhman, Kevin L.; Sicilia-Aguilar, Aurora; Wang, Junfeng; Garmire, Gordon P. (2009). "Protoplanetary Disk Evolution Around the Triggered Star-Forming Region Cepheus B". The Astrophysical Journal. 699 (2): 1454–1472. arXiv:0904.4907. Bibcode:2009ApJ...699.1454G. doi:10.1088/0004-637X/699/2/1454. ISSN 0004-637X. S2CID 18149231.
^Mobberley, M. (9 March 2017). The Caldwell Objects and How to Observe Them. Springer. ISBN9781441903266.
also, designated, caldwell, sharpless, s155, lbn529, diffuse, nebula, constellation, cepheus, within, larger, nebula, complex, containing, emission, reflection, dark, nebulosity, widely, known, cave, nebula, though, that, name, applied, earlier, different, neb. Sh2 155 also designated Caldwell 9 Sharpless 155 or S155 or LBN529 is a diffuse nebula in the constellation Cepheus within a larger nebula complex containing emission reflection and dark nebulosity It is widely known as the Cave Nebula though that name was applied earlier to Ced 201 a different nebula in Cepheus Sh2 155 is an ionized H II region with ongoing star formation activity 1 at an estimated distance of 725 parsecs 2400 light years from Earth 2 3 Sh2 155Emission nebulaSh2 155Observation data J2000 0 epochRight ascension22h 57m 17 14sDeclination 62 28 33 4 Distance2400 lyApparent magnitude V 7 7Apparent dimensions V 50 0 x30 0 ConstellationCepheusPhysical characteristicsRadius35 lyAbsolute magnitude V 16DesignationsSh2 155 Caldwell 9 LBN 110 11 02 44See also Lists of nebulae Sh2 155 4 was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue 5 being a part of the much larger Cep OB3 Association 5 Although Sh2 155 is relatively faint for amateur observation some of its structure may be seen visually through a moderately sized telescope under dark skies 6 7 Sh2 155 lies at the edge of the Cepheus B cloud part of the Cepheus molecular cloud and is ionized by young stars from the Cep OB3 association 8 It has been suggested that radiation from the hot O type star HD 217086 is compressing the region triggering the formation of a new generation of stars 9 A study of the region s young stellar objects by the Chandra X ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud supporting the hypothesis of triggered star formation 10 11 Other name designations edit nbsp Amateur photograph of the Cave Nebula in the Hubble palette The name Cave Nebula was coined for this object by Patrick Moore presumably derived from photographic images showing a curved arc of emission nebulosity corresponding to a cave mouth 12 The name was also used earlier to refer to another brighter but unrelated reflection nebula in Cepheus known as Ced 201 13 or VdB 152 14 15 positioned at R A 22h 13m 27s Dec 70 15 18 2000 The name s application to Sh2 155 has come into vogue through the nebula s inclusion in Moore s Caldwell catalogue 16 as object Caldwell 9 SIMBAD lists the name for Ced 201 but not for Sh2 155 4 13 References edit Getman Konstantin V Feigelson Eric D Townsley Leisa Broos Patrick Garmire Gordon Tsujimoto Masahiro 2006 ChandraStudy of the Cepheus B Star forming Region Stellar Populations and the Initial Mass Function The Astrophysical Journal Supplement Series 163 2 306 334 arXiv astro ph 0601405 Bibcode 2006ApJS 163 306G doi 10 1086 501453 ISSN 0067 0049 S2CID 16305023 Blaauw A Hiltner W A Johnson H L 1959 Photoelectric Photometry of the Association III Cephei The Astrophysical Journal 130 69 Bibcode 1959ApJ 130 69B doi 10 1086 146697 ISSN 0004 637X Crawford D L Barnes J V 1970 Four color and H beta photometry of open clusters VI the association III Cep The Astronomical Journal 75 952 Bibcode 1970AJ 75 952C doi 10 1086 111045 ISSN 0004 6256 a b Sh2 155 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 11 March 2017 a b Sharpless S 1959 A Catalogue of H II Regions Astrophysical Journal Supplement 4 257 Bibcode 1959ApJS 4 257S doi 10 1086 190049 Patrick Moore 1990 The Amateur Astronomer 11th ed W W Norton amp Company ISBN 0 393 02864 X Trusock T 11 March 2017 The Caldwell Objects Deep Sky Companions PDF Panagia N Thum C 1981 A study of the S 155A CEP B cloud and its relation to Cepheus OB3 association Astronomy and Astrophysics 92 2 295 299 Bibcode 1981A amp A 98 295P Minchin Nigel R Ward Thompson Derek White Glenn J 1992 Carbon monoxide and far infrared observations of the S 155 Cepheus B region Astronomy and Astrophysics 265 2 733 742 Bibcode 1992A amp A 265 733M Cepheus B Trigger Happy Star Formation chandra harvard edu August 12 2009 Retrieved March 12 2017 Getman Konstantin V Feigelson Eric D Luhman Kevin L Sicilia Aguilar Aurora Wang Junfeng Garmire Gordon P 2009 Protoplanetary Disk Evolution Around the Triggered Star Forming Region Cepheus B The Astrophysical Journal 699 2 1454 1472 arXiv 0904 4907 Bibcode 2009ApJ 699 1454G doi 10 1088 0004 637X 699 2 1454 ISSN 0004 637X S2CID 18149231 Mobberley M 9 March 2017 The Caldwell Objects and How to Observe Them Springer ISBN 9781441903266 a b Ced 201 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 11 March 2017 VdB 152 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 12 March 2017 APOD 2012 October 31 VdB 152 A Ghost in Cepheus apod nasa gov Retrieved 11 March 2017 O Meara Stephen James 2002 The Caldwell Objects Cambridge University Press ISBN 978 0 521 82796 6 External links edit nbsp Wikimedia Commons has media related to Cave Nebula Sh2 155 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images The Scale of the Universe Astronomy Picture of the Day 2012 March 12 Retrieved from https en wikipedia org w index php title Sh2 155 amp oldid 1223758515, wikipedia, wiki, book, books, library,
