Delta Crucis

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Delta Crucis
Die Suiderkruis, met Delta Crucis regs.
Die Suiderkruis, met Delta Crucis regs.
Sterrebeeld Suiderkruis
Spektraaltipe B2 IV[1]
Soort Subreus
Waarnemingsdata (Epog J2000)
Regte klimming 12h 15m 08.71673s[2]
Deklinasie -58° 44′ 56.1369″[2]
Skynmagnitude (m) 2,79[3]
Absolute magnitude (M) -3,2[4]
B-V-kleurindeks  -0,235[5]
U-B-kleurindeks  -0,921[5]
Besonderhede
Massa (M) 8,9 ± 0,1[6]
Radius (R) 8[7]
Ligsterkte (L) 10 000[4]
Ouderdom (jaar) 18,1 ± 3,2 miljoen[6]
Temperatuur (K) 22 570 ± 1 840[8]
Rotasiespoed (km/s) 210[9]
Eienskappe
Veranderlikheid β Cep[10]
Ander name
CD-58 4466, FK5 455, HD 106490, HIP 59747, HR 4656, SAO 239791.[11]
Portaal  Portaalicoon   Sterrekunde

Delta Crucis (δ Crucis, afgekort as Delta Cru of δ Cru) is ’n ster in die suidelike sterrebeeld Suiderkruis (Crux). Dit het ’n skynbare magnitude van 2,79 en is sowat 345 ligjare van die Son af. Dit is die dofste van die vier helder sterre wat die asterisme Suiderkruis vorm. Delta Crucis het ’n groot massa, hoë temperatuur en vinnige rotasiespoed, en is besig om in ’n reusester te ontwikkel.

Eienskappe[wysig | wysig bron]

Die ster het ’n sterreklassifikasie van B2 IV,[1] en is dus ’n subreus wat van die hoofreeks af wegbeweeg. Ná sy rooireusfase sal dit ’n witdwerg word. Sy ligsterkte is tans 10 000 keer dié van die Son en sy effektiewe temperatuur 22 570 K;[4] dit gee daaraan die blouwit skynsel van ’n B-tipe ster.[12]

Delta Crucis is ’n sterk kandidaat-Beta Cephei-veranderlike[10] wat sy helderheid met ’n periode van 1,3 uur subtiel verander. Sy rotasiesnelheid is baie vinnig: sowat 210 km s-1.[9]

Verwysings[wysig | wysig bron]

  1. 1,0 1,1 Houk, Nancy; Cowley, A. P. (1978), Catalogue of two-dimensional spectral types for the HD stars: Declinations -90 to -53, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode1975mcts.book.....H 
  2. 2,0 2,1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V 
  3. Wielen, R. et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode1999VeARI..35....1W 
  4. 4,0 4,1 4,2 de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1-2): 44–61, Bibcode1989A&A...216...44D 
  5. 5,0 5,1 Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement 15: 459, doi:10.1086/190168, Bibcode1968ApJS...15..459G 
  6. 6,0 6,1 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode2011MNRAS.410..190T 
  7. Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, doi:10.1093/mnras/189.3.601, Bibcode1979MNRAS.189..601U 
  8. Sokolov, N. A. (May 1995), "The determination of T_eff_ of B, A and F main sequence stars from the continuum between 3200 A and 3600 A", Astronomy and Astrophysics Supplement 110: 553, Bibcode1995A&AS..110..553S 
  9. 9,0 9,1 (1970) “A catalogue of stellar rotational velocities”. Contributi Osservatorio Astronomico di Padova in Asiago 239 (1).
  10. 10,0 10,1 Telting, J. H. et al. (June 2006), "A high-resolution spectroscopy survey of β Cephei pulsations in bright stars", Astronomy and Astrophysics 452 (3): 945–953, doi:10.1051/0004-6361:20054730, Bibcode2006A&A...452..945T 
  11. "HD 106490 – Variable Star of beta Cep type", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=delta+crucis, besoek op 2005-11-05 
  12. "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, archived from the original on 2012-03-10, http://www.webcitation.org/6630AbtJZ?url=http%3A%2F%2Foutreach.atnf.csiro.au%2Feducation%2Fsenior%2Fastrophysics%2Fphotometry_colour.html, besoek op 2012-01-16 

Eksterne skakels[wysig | wysig bron]

Koördinate: Sky map 12h 15m 08.71673s, −58° 44′ 56.1369″