| 词条 | Chamaeleon complex |
| 释义 |
The Chamaeleon complex is a large star forming region (SFR) that includes the Chamaeleon I, Chamaeleon II, and Chamaeleon III dark clouds. It occupies nearly all of the constellation Chamaeleon and overlaps into Apus, Musca, Carina and Octans. The mean density of X-ray sources is about one source per square degree.[2] Chamaeleon I dark cloudThe Chamaeleon I (Cha I) cloud is one of the nearest active star formation regions at ~160 pc.[3] It is relatively isolated from other star-forming clouds, so it is unlikely that older pre-main sequence (PMS) stars have drifted into the field.[3] The total stellar population is 200-300.[3] The Cha I cloud is further divided into the North cloud or region and South cloud or main cloud. HD 97300 emits X-rays, illuminates the reflection nebula Ced 112 and is one of the highest mass members of the Cha I cloud, spectral type B9V, a Herbig Ae/Be star without emission lines.[3] Cha Halpha 1 is an M8 object in the Chamaeleon I dark cloud that was determined in 1998 to be an X-ray source and as such is the first X-ray emitting brown dwarf found. There are some seventy to ninety X-ray sources in the Chamaeleon I star forming region.[4] The Uhuru X-ray source (4U 1119-77) is within the Chamaeleon I cloud. This source region within the Chamaeleon I dark cloud was observed by ROSAT on February 9 at 22:14:47 UTC to February 18, 1991, 17:59:12 UTC, and on March 6, 1991, from 09:12:19 to 13:05:13 UTC.[4] This cloud contains both "weak" T Tauri (WTT) stars and "classical" T Tauri (CTT) stars.[4] Chamaeleon I X-ray ROSAT source 66 is at RA 11h 17m 36.4-37.9s Dec -77° 04' 27-50", is a CTT, Chamaeleon I No. T56, aka CTT star HM 32.[4] The Chamaeleon I dark cloud was observed with the Imaging Proportional Counter (IPC) on board the Einstein Observatory for 2.5 h on January 23–24, 1981, identifying some 22 X-ray sources.[5] None of these sources was closer than 8' to 4U 1119-77. Chamaeleon II dark cloudChamaeleon II contains the Uhuru source 4U 1302-77. It is close to RXJ 1303.1-7706 at RA 13h 03m 04.70s Dec -77° 06' 55.0", a K7-M0 new WTT.[2] The Chamaeleon II dark cloud contains some 40 X-ray sources.[6] Observation in Chamaeleon II was carried out from September 10 to 17, 1993.[6] Source RXJ 1301.9-7706, a new WTTS candidate of spectral type K1, is closest to 4U 1302-77.[6] Chamaeleon III dark cloud"Chamaeleon III appears to be devoid of current star-formation activity."[7] References1. ^{{cite news|title=A nursery for unruly young stars|url=http://www.spacetelescope.org/images/potw1405a/|accessdate=4 February 2014|newspaper=ESA/Hubble Picture of the Week}} 2. ^1 {{ cite journal |author1=Alcala JM |author2=Krautter J |author3=Schmitt JHMM |author4=Covino E |author5=Wichmann R |author6=Mundt R |title=A study of the Chamaeleon star forming region from the ROSAT all-sky survey. I. X-ray observations and optical identifications |journal=Astron. Astrophys. |date=Nov 1995 |volume=114 |issue=11 |pages=109–34 |bibcode=1995A&AS..114..109A }} 3. ^1 2 3 {{ cite journal |doi=10.1086/423613 |vauthors=Feigelson ED, Lawson WA |title=An X-ray census of young stars in the Chamaeleon I North Cloud |journal=Astrophys. J. |date=Oct 2004 |volume=614 |issue=10 |pages=267–83 |url=http://www.iop.org/EJ/article/0004-637X/614/1/267/60370.web.pdf?request-id=63d27661-73a2-47f1-8b87-17c4df8c7e65 |bibcode=2004ApJ...614..267F|arxiv = astro-ph/0406529 }} 4. ^1 2 3 {{ cite journal |vauthors=Feigelson ED, Casanova S, Montmerle T, Guibert J |title=ROSAT X-Ray Study of the Chamaeleon I Dark Cloud. I. The Stellar Population |journal=Astrophys. J. |date=Oct 1993 |volume=416 |issue=10 |pages=623–46 |bibcode=1993ApJ...416..623F |doi=10.1086/173264 }} 5. ^{{ cite journal |vauthors=Feigelson ED, Kriss GA |title=Soft X-ray observations of pre-main-sequence stars in the Chamaeleon dark cloud |journal=Astrophys. J. |date=Mar 1989 |volume=338 |issue=3 |pages=262–76 |bibcode=1989ApJ...338..262F |doi=10.1086/167196 }} 6. ^1 2 {{ cite journal |author1=Alcalá JM |author2=Covino E |author3=Sterzik MF |author4=Schmitt JHMM |author5=Krautter J |author6=Neuhäuser R |title=A ROSAT pointed observation of the Chamaeleon II dark cloud |journal=Astron. Astrophys. |date=Mar 2000 |volume=355 |issue=3 |pages=629–38 |bibcode=2000A&A...355..629A }} 7. ^{{ cite journal |vauthors=Yamauchi S, Hamaguchi K, Koyama K, Murakami H |title=ASCA Observations of the Chamaeleon II Dark Cloud |journal=Publ. Astron. Soc. Jpn. |date=Oct 1998 |volume=50 |issue=10 |pages=465–74 |bibcode=1998PASJ...50..465Y |doi = 10.1093/pasj/50.5.465 }} 1 : Star-forming regions |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。