Alpha Indi (afgekort as α Ind) is ’n ster in die sterrebeeld Indiër en is sowat 98 ligjare van die Son af.[2] Sy sterreklassifikasie is K0 III-IV,[1] en dit het dus die waterstof in sy kern opgebruik en weg van die hoofreeks geëvolueer. Sy massa is dubbel dié van die Son en dit is na raming 1 miljard jaar oud.[4] As ’n reusester het dit uitgesit tot 12 keer die Son se radius.[5] Sy effektiewe temperatuur is 4 893 K,[6] en dit het dus die oranje kleur wat tipies is van ’n K-tipe ster.[8]
| Alpha Indi
|
|
| Die ligging van Alpha Indi (in die rooi sirkel).
|
| Sterrebeeld |
Indiër
|
| Spektraaltipe |
K0 III–IV[1]
|
| Soort |
Reusester
|
| Waarnemingsdata (Epog J2000)
|
| Regte klimming |
20h 37m 34.03201s[2]
|
| Deklinasie |
-47° 17′ 29.4026″[2]
|
| Skynmagnitude (m) |
3,11[3]
|
| Absolute magnitude (M) |
0,65[4]
|
| B-V-kleurindeks |
+1,00[3]
|
| U-B-kleurindeks |
+0,79[3]
|
| Besonderhede
|
| Massa (M☉) |
2[4]
|
| Radius (R☉) |
12[5]
|
| Ouderdom (jaar) |
1 miljard[4]
|
| Temperatuur (K) |
4 893[6]
|
| Afstand (ligjaar) |
98
|
| Metaalinhoud [Fe/H] |
0,03[6]
|
| Ander name
|
| HD 196171, HR 7869, SAO 230300, FK5 769, CD −47 13477, HIP 101772[7]
|
|
|
Dit kan twee nabygeleë M-tipe metgeselle hê wat minstens 2 000 AE van die hoofster af is.[9]
- ↑ 1,0 1,1 Gray, R. O. et al. (Julie 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G
- ↑ 2,0 2,1 2,2 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ↑ 3,0 3,1 3,2 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode: 1966CoLPL...4...99J
- ↑ 4,0 4,1 4,2 4,3 Thorén, P.; Edvardsson, B.; Gustafsson, B. (Oktober 2004), "Subgiants as probes of galactic chemical evolution", Astronomy and Astrophysics 425: 187–206, doi:10.1051/0004-6361:20040421, Bibcode: 2004A&A...425..187T
- ↑ 5,0 5,1 Pasinetti Fracassini, L. E. et al. (Februarie 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P
- ↑ 6,0 6,1 6,2 Gratton, R. G.; Ortolani, S. (November 1986), "The forbidden O/Fe ratio in metal-poor late-type stars", Astronomy and Astrophysics 169 (1-2): 201–207, Bibcode: 1986A&A...169..201G
- ↑ "alf Ind -- Star in double system", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Alpha+Indi, besoek op 2011-12-12
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), 21 Desember 2004, archived from the original on 10 Maart 2012, https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, besoek op 2012-01-16
- ↑ Kaler, James B., "The Persian (Alpha Indi)", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/persian.html, besoek op 2011-12-23
Hierdie artikel is vertaal uit die Engelse Wikipedia