12 Canis Majoris

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12 Canis Majoris
Sterrebeeld Groot Hond
Spektraaltipe B7 II/III[1] of B5 V[2]
Waarnemingsdata (Epog J2000)
Regte klimming 06h 47m 01.48373s
Deklinasie -21° 00′ 55.4494″
Skynmagnitude (m) 6,07[3] of (6,00-6,05)[4]
Absolute magnitude (M) -0,81[3]
B-V-kleurindeks  −0,159±0,004[3]
Besonderhede
Massa (M) 1,25[5]
Radius (R) 2,73[6]
Ligsterkte (L) 497,88[3]
Temperatuur (K) 15 830±60[7]
Rotasiespoed (km/s) 9,5±0,3
Metaalinhoud [Fe/H] -0.37[8]
Eienskappe
Veranderlikheid SX Arietis[4]
Ander name
HK CMa, F 12 Cep, BD−20°1576, FK5 817, HD 49333, HIP 32504, HR 2509, SAO 172318, GC 8884[9]
Portaal  Portaalicoon   Sterrekunde

12 Canis Majoris is ’n veranderlike ster 184 ligjare van die Son af in die suidelike sterrebeeld Groot Hond (Canis Major).[9] Dit het die veranderlikesternaam HK Canis Majoris (12 Canis Majoris is sy Flamsteed-naam). Met ’n skynbare magnitude van 6,07[3] is dit net-net met die blote oog sigbaar as ’n dowwe, blouwit ster. Dit beweeg weg van die Son teen ’n radiale snelheid van 16 km/s.[3] Dit is die helderste ster in die nabyheid van die oop sterreswerm NGC 2287,[10] hoewel dit na aanleiding van sy eiebeweging waarskynlik nie lid daarvan is nie.[11]

Die ster het ’n sterreklassifikasie van B7 II/III,[1] wat ooreenstem met dié van ’n B-tipe reus/helder reus.[1] Dit is ’n magnetiese Bp-ster[12] van die soort met min helium (CP4), met ’n spektrum wat getuienis toon van vertikale stratifikasie van helium in sy atmosfeer.[13] Samus et al. (2017) klassifiseer dit as ’n SX Arietis-veranderlike met ’n helderheid wat oor ’n periode van 2,18045 dae wissel van magnitude 6,00 tot 6,05.[4]

Die ster se massa is 1,25 keer dié van die Son[5] en sy radius 2,73 keer die Son s’n.[6] Sy ligsterkte is 498 keer dié van die Son[3] en sy effektiewe temperatuur is 6 500 K.[8]

Verwysings[wysig | wysig bron]

  1. 1,0 1,1 1,2 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode1988mcts.book.....H. 
  2. Cidale, L. S. et al. (June 2007), "Fundamental parameters of He-weak and He-strong stars", Astronomy and Astrophysics 468 (1): 263–272, doi:10.1051/0004-6361:20066454, Bibcode2007A&A...468..263C. 
  3. 3,0 3,1 3,2 3,3 3,4 3,5 3,6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  4. 4,0 4,1 4,2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, Bibcode2017ARep...61...80S. 
  5. 5,0 5,1 Goupil, M. J. et al. (November 2006), "Rotational Splittings with CoRoT, Expected Number of Detections and Measurement Accuracy", in Fridlund, M.; Baglin, A.; Lochard, J. et al., Proceedings of "The CoRoT Mission Pre-Launch Status - Stellar Seismology and Planet Finding" (ESA SP-1306), p. 453, ISBN 92-9092-465-9, Bibcode2006ESASP1306..453G. 
  6. 6,0 6,1 Shulyak, D. et al. (2014), "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities", Monthly Notices of the Royal Astronomical Society 443 (2): 1629, doi:10.1093/mnras/stu1259, Bibcode2014MNRAS.443.1629S. 
  7. Netopil, M. et al. (November 2008), "Chemically peculiar stars and their temperature calibration", Astronomy and Astrophysics 491 (2): 545−554, doi:10.1051/0004-6361:200810325, Bibcode2008A&A...491..545N. 
  8. 8,0 8,1 Mosser, B. et al. (February 2005), "Seismology and activity of the F type star HD 49933", Astronomy and Astrophysics 431: L13–L16, doi:10.1051/0004-6361:200500003, Bibcode2005A&A...431L..13M. 
  9. 9,0 9,1 "12 CMa". Simbad. Centre de données astronomiques de Strasbourg. Besoek op 30 April 2019
  10. Feinstein, A. et al. (1979), "Multicolor photometry of the open cluster NGC 2287", International Astronomical Union, Reunion Astronomica Regional Latinoamericana, 1st, Santiago, Chile, Jan. 16-21, 1978, 3, Chile, Universidad: Departamento de Astronomia, Publicaciones, pp. 146–149, Bibcode1979rarl.conf..146F. 
  11. Levato, H.; Garcia, B. (1984), "Axial rotation in NGC 2287", Astrophysical Letters 24 (3): 161-164, Bibcode1984ApL....24..161L. 
  12. Bailey, J. D.; Landstreet, J. D. (2013), "Abundances determined using Si ii and Si iii in B-type stars: Evidence for stratification", Astronomy & Astrophysics 551: A30, doi:10.1051/0004-6361/201220671, Bibcode2013A&A...551A..30B. 
  13. Farthmann, M. et al. (November 1994), "Stratification of helium in the photospheres of the helium-weak stars HD 28843 and HD 49333", Astronomy and Astrophysics 291: 919–927, Bibcode1994A&A...291..919F. 

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