| 词条 | Sh2-155 |
| 释义 |
| name = Sh2-155 | image = CaveHunterWilson.jpg |caption = Sh2–155 | type = Emission | type2 = | epoch = J2000.0 | ra = 22h 57m 17.14s | dec = +62° 28′ 33.4" | dist_ly = 2400 | appmag_v = 7.7 | size_v = 50.0'x30.0' | constellation = Cepheus | radius_ly = 35 | absmag_v = 16 | notes = | names = Sh2-155, Caldwell 9, LBN 110.11+02.44}}Sh2-155 (also designated Sharpless 155 or S155) 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] 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 designationsThe 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] References1. ^{{cite journal|last1=Getman|first1=Konstantin V.|last2=Feigelson|first2=Eric D.|last3=Townsley|first3=Leisa|last4=Broos|first4=Patrick|last5=Garmire|first5=Gordon|last6=Tsujimoto|first6=Masahiro|title=ChandraStudy of the Cepheus B Star‐forming Region: Stellar Populations and the Initial Mass Function|journal=The Astrophysical Journal Supplement Series|volume=163|issue=2|year=2006|pages=306–334|issn=0067-0049|doi=10.1086/501453|arxiv = astro-ph/0601405 |bibcode = 2006ApJS..163..306G }} 2. ^{{cite journal|last1=Blaauw|first1=A.|last2=Hiltner|first2=W. A.|last3=Johnson|first3=H. L.|title=Photoelectric Photometry of the Association III Cephei.|journal=The Astrophysical Journal|volume=130|year=1959|pages=69|issn=0004-637X|doi=10.1086/146697|bibcode = 1959ApJ...130...69B }} 3. ^{{cite journal|last1=Crawford|first1=D. L.|last2=Barnes|first2=J. V.|title=Four-color and H-beta photometry of open clusters - VI - the association III Cep.|journal=The Astronomical Journal|volume=75|year=1970|pages=952|issn=0004-6256|doi=10.1086/111045|bibcode = 1970AJ.....75..952C }} 4. ^1 {{cite simbad|title=Sh2-155|accessdate=11 March 2017}} 5. ^1 {{cite journal|last=Sharpless |first=S.|year=1959|title=A Catalogue of H II Regions|url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1959ApJS....4..257S|journal=Astrophysical Journal Supplement|volume=4 |pages=257|bibcode=1959ApJS....4..257S|doi=10.1086/190049|accessdate=9 March 2017}} 6. ^Patrick Moore (1990). The Amateur Astronomer (11th ed), W.W. Norton & Company, {{ISBN|0-393-02864-X}} 7. ^{{Cite web|last=Trusock |first=T.|date=11 March 2017 |title=The Caldwell Objects – Deep Sky Companions|url=http://www.cloudynights.com/documents/caldwell.pdf}} 8. ^{{Cite journal|last1 = Panagia |first1=N. |last2 = Thum |first2=C.|year=1981|title = A study of the S 155A - CEP B cloud and its relation to Cepheus OB3 association|journal= Astronomy and Astrophysics|volume=92|issue=2|pages= 295–299|bibcode=1981A&A....98..295P}} 9. ^{{Cite journal|last1 = Minchin |first1=Nigel R. |last2 = Ward-Thompson |first2=Derek|last3 = White |first3=Glenn J.|year=1992|title = Carbon monoxide and far-infrared observations of the S 155-Cepheus B region|journal= Astronomy and Astrophysics|volume= 265|issue=2|pages= 733–742|bibcode=1992A&A...265..733M}} 10. ^{{cite web| url=http://chandra.harvard.edu/photo/2009/cepb/|title= Cepheus B: Trigger-Happy Star Formation|access-date=March 12, 2017|website=chandra.harvard.edu|date=August 12, 2009}} 11. ^{{cite journal|last1=Getman|first1=Konstantin V.|last2=Feigelson|first2=Eric D.|last3=Luhman|first3=Kevin L.|last4=Sicilia-Aguilar|first4=Aurora|last5=Wang|first5=Junfeng|last6=Garmire|first6=Gordon P.|title=PROTOPLANETARY DISK EVOLUTION AROUND THE TRIGGERED STAR-FORMING REGION CEPHEUS B|journal=The Astrophysical Journal|volume=699|issue=2|year=2009|pages=1454–1472|issn=0004-637X|doi=10.1088/0004-637X/699/2/1454|arxiv = 0904.4907 |bibcode = 2009ApJ...699.1454G }} 12. ^{{Cite web|last=Mobberley|first=M.|date=9 March 2017 |title=The Caldwell Objects and How to Observe Them|url=https://books.google.com.au/books?id=amPrWoOWgHcC&pg=PA30&lpg=PA30&dq=Caldwell+9&source=bl&ots=Q6Ig_bKkrj&sig=jBGBsu_k68fvQI5JwUXIhN6sU48&hl=en&sa=X&ved=0ahUKEwidg6Dtm8TSAhVEFZQKHfY8AqgQ6AEIhwEwFw#v=onepage&q=Caldwell%209&f=false}} 13. ^1 {{cite simbad|title=Ced 201|accessdate=11 March 2017}} 14. ^{{cite simbad|title=VdB 152|accessdate=12 March 2017}} 15. ^{{cite web|title=APOD: 2012 October 31 - VdB 152: A Ghost in Cepheus|url=https://apod.nasa.gov/apod/ap121031.html|website=apod.nasa.gov|accessdate=11 March 2017}} 16. ^{{cite book| last = O'Meara| first = Stephen James| title = The Caldwell Objects| publisher = Cambridge University Press| year = 2002| isbn = 978-0-521-82796-6}} External links{{commons category}}{{WikiSky}}
5 : Cepheus (constellation)|Emission nebulae|Sharpless objects|Caldwell objects|Star-forming regions |
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