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12 Canis Majoris

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]

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

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
  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, Bibcode: 1988mcts.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, Bibcode: 2007A&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, Bibcode: 2012AstL...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, Bibcode: 2017ARep...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, Bibcode: 2006ESASP1306..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, Bibcode: 2014MNRAS.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, Bibcode: 2008A&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, Bibcode: 2005A&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, Bibcode: 1979rarl.conf..146F. 
  11. ↑ Levato, H.; Garcia, B. (1984), "Axial rotation in NGC 2287", Astrophysical Letters 24 (3): 161-164, Bibcode: 1984ApL....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, Bibcode: 2013A&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, Bibcode: 1994A&A...291..919F. 

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