| 词条 | CD Crucis |
| 释义 |
| name = CD Crucis }}{{Starbox observe | epoch = J2000 | constell = Crux | ra= {{RA|12|43|50.99768}}[1] | dec= {{DEC|-63|05|14.8029}}[1] | appmag_v = 10.81[2] {{nowrap|(10.71 - 10.82[4])}} }}{{Starbox character | class = WN6o + O5V[3] | b-v = +0.83[2] | u-b = −0.19[2] | variable = Eclipsing binary[4] }}{{Starbox astrometry | radial_v = 8.00[5] | prop_mo_ra = {{val|−5.921|0.052}}[10] | prop_mo_dec = {{val|−0.409|0.047}}[10] | parallax = 0.2336 | p_error = 0.0382 | parallax_footnote = [6] | dist_pc = | absmag_v = −6.2 {{nowrap|(−5.2 + −5.7[7])}} }}{{Starbox orbit | reference = [3][8] | primary = WR | name = O | period = | period_unitless = 6.23930 days | axis = 0.3010 | axis_unitless = {{solar radius|68}} | eccentricity = 0 | inclination = 67 ± 3 | node = 3.10 | periastron = | periarg = | periarg_primary = | k1 = 263 ± 4 | k2 = 218 ± 9 }}{{Starbox detail | source = | component1 = WR | mass = 42.6 ± 3.6[16] | radius = 5[9] | temperature = | luminosity = 127,000[3] | gravity = | metal = | rotational_velocity = | age = | component2 = O | mass2 = 51.0 ± 2.8[9] | radius2 = 12[9] | luminosity2 = 880,000[3] | temperature2 = | gravity2 = | rotational_velocity2 = }}{{Starbox catalog | names = CD Crucis, HIP 62115, HD 311884, WR 47, 2MASS J12435102-6305148, AAVSO 1238-62 }}{{Starbox reference | Simbad = CD+Cru }}{{Starbox end}} CD Crucis, also known as HD 311884, is an eclipsing binary star system in the constellation Crux. It is around 14,000 light years away near the faint open cluster Hogg 15. The binary contains a Wolf-Rayet star and is also known as WR 47. SystemCD Cru is composed of two massive and highly luminous stars aligned so that they eclipse each other as they orbit every 6 days and 6 hours. One is a hot blue O-type main sequence star of spectral type O5V that is 57 times as massive as the Sun, while the other is an even hotter Wolf-Rayet star of spectral type WN6 that is 48 times as massive as the Sun. The WR star dominates the spectrum but is less bright, so which star is considered the primary varies. For clarity the components are referred to as WR and O[3][8] Hogg 15Hogg 15 is a small faint open cluster that has been calculated to lie about 4.2 kpc away. CD Cru is considered a likely member of the cluster, in which case it would be the brightest member by over a magnitude. It lies outside the central two arc-minute condensation of the cluster, but well within the outer bounds discovered for the member stars. The cluster is calculated to be only eight million years old.[10] The brighter and closer cluster NGC 4609 lies 10 arc-minutes away, and both clusters are near the centre of the dark Coalsack Nebula. Both clusters are actually more distant than the Coalsack so are seen through it rather than against it. It suffers 3.5 magnitudes of interstellar extinction.[3] Between the two clusters lies the 5th magnitude BZ Crucis, a much closer foreground object. PropertiesThe WR component is five times the radius of the sun, but its high temperature means it is over 100,000 times more luminous. Its mass is determined from the orbital motion to be {{solar mass|42.6}}. The O star is larger at {{solar radius|12}}, more luminous at {{solar luminosity|880,000}}, and more massive at {{solar mass|51}}. Although the stars are only separated by around {{solar radius|68}}, they are well separated because of their small size. References1. ^1 {{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }} {{Stars of Crux}}2. ^1 2 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati|first1=J. R.|year=2002}} 3. ^1 2 3 4 5 {{Cite journal | last1 = Bhatt | first1 = H. | last2 = Pandey | first2 = J. C. | last3 = Kumar | first3 = B. | last4 = Singh | first4 = K. P. | last5 = Sagar | first5 = R. | title = X-ray emission characteristics of two Wolf-Rayet binaries: V444 Cyg and CD Cru | doi = 10.1111/j.1365-2966.2009.15999.x | journal = Monthly Notices of the Royal Astronomical Society | volume = 402 | issue = 3 | pages = 1767 | year = 2010 | pmid = | pmc = |arxiv = 0911.1489 |bibcode = 2010MNRAS.402.1767B }} 4. ^1 {{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 5. ^{{cite journal|bibcode=2004A&A...424..727P|title=SB9: The ninth catalogue of spectroscopic binary orbits|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727|author1=Pourbaix|first1=D.|last2=Tokovinin|first2=A. A.|last3=Batten|first3=A. H.|last4=Fekel|first4=F. C.|last5=Hartkopf|first5=W. I.|last6=Levato|first6=H.|last7=Morrell|first7=N. I.|last8=Torres|first8=G.|last9=Udry|first9=S.|year=2004|doi=10.1051/0004-6361:20041213|arxiv = astro-ph/0406573 }} 6. ^1 2 {{cite DR2|6055101523064612864}} 7. ^{{cite journal|bibcode=2002A&A...387..108P|title=A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47|journal=Astronomy and Astrophysics|volume=387|pages=108|author1=Piatti|first1=A. E.|last2=Bica|first2=E.|last3=Santos|first3=J. F. C.|last4=Clariá|first4=J. J.|year=2002|doi=10.1051/0004-6361:20020373|url=http://www.lume.ufrgs.br/bitstream/10183/98760/1/000317839.pdf}} 8. ^1 {{cite journal|bibcode=2012MNRAS.424.1601F|title=Colliding winds in five WR+O systems of the Southern hemisphere|journal=Monthly Notices of the Royal Astronomical Society|volume=424|issue=3|pages=1601|author1=Fahed|first1=R.|last2=Moffat|first2=A. F. J.|year=2012|doi=10.1111/j.1365-2966.2012.20494.x}} 9. ^1 2 3 {{cite journal|bibcode=1990ApJ...350..767M|title=Photometric and polarimetric variability and mass-loss rate of the massive binary Wolf-Rayet star HDE 311884 (WN6 + 05: V)|journal=Astrophysical Journal|volume=350|pages=767|author1=Moffat|first1=Anthony F. J.|last2=Drissen|first2=Laurent|last3=Robert|first3=Carmelle|last4=Lamontagne|first4=Robert|last5=Coziol|first5=Roger|last6=Mousseau|first6=Normand|last7=Niemela|first7=Virpi S.|last8=Cerruti|first8=Miguel A.|last9=Seggewiss|first9=Wilhelm|last10=Van Weeren|first10=Niels|year=1990|doi=10.1086/168429}} 10. ^{{cite journal|bibcode=1974A&A....34...29M|title=The Wolf-Rayet star HDE 311884 in the open cluster HOGG 15|journal=Astronomy and Astrophysics |volume=34|pages=29|author1=Moffat|first1=A. F. J.|year=1974}} 8 : Crux (constellation)|Objects with variable star designations|Henry Draper Catalogue objects|O-type main-sequence stars|Wolf–Rayet stars|2MASS objects|Hipparcos objects|Eclipsing binaries |
| 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。