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*[[Stella]]
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*[[diagramma Herzsprung — Russel]]
*[[diagramma Hertzsprung — Russel]]


[[Categoria:Astronomia]]
[[Categoria:Astronomia]]

Emendatio ex 09:27, 16 Novembris 2008

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Quapropter rogamus ut corrigas, praecipue introductionem, formam, nexusque extra et intra Vicipaediam.

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Introductio

Classificatio Harvardiana

Classificatione Harvardiana, stellae dividuntur in classes O—B—A—F—G—K—M—C—S. Plerumque communes sunt stellae classium O—B—A—F—G—K—M, quae appellantur "stellae normales," sed stellae classium C—S (atque R, N, T, L) sunt "stellae peculiares," hoc est stellae quae spectrum "peculiare" habent.

Tabula classium

Classis Temperatura Color verus Coror visibilis[1][2] Massa
(in massis Solis)
Radius
(in radiis Solis)
Luminsoitas Lineae Hydrogenii % e stellis seriei capitalis
O 30,000–60,000 K Caeruleus Caeruleus 60 M 15 R 1,400,000 L debiles ~0.00003%
B 10,000–30,000 K albus-caruleus albus caerleus albusque 18 M 7 R 20,000 L medii 0.13%
A 7,500–10,000 K Albus Albus 3.1 M 2.1 R 80 L lucidi 0.6%
F 6,000–7,500 K ochroleucus albus 1.7 M 1.3 R 6 L medii 3%
G 5,000–6,000 K flavus ochroleucus 1.1 M 1.1 R 1.2 L debiles 8%
K 3,500–5,000 K aurantinus rutilis 0.8 M 0.9 R 0.4 L admodum debiles 13%
M 2,000–3,500 K Ruber flammeus 0.3 M 0.4 R 0.04 L admodum debiles >78%

Classificatio Yerkes

Factor supplementaruis afficiens in characterem spectri est densitas stratorum exteriorum stellae, dependens a massa et densitate stellae, hoc est a luminositate. Admodum a lumnositate SrII, BaII, FeII, TiII dependunt, propterea est differentia spectrorum stellarum gigantum et pumilionum aequalibus classibus Harvardianis.

Ha clssificatione stella habet classem luminocitatis:

  • I Supergigantes
  • II Lucidi gigantes
    • IIa, e.g.: β Scuti (HD 173764) (spectrum G4 IIa)
    • IIab, e.g.: HR 8752 (spectrum G0Iab:)
    • IIb, e.g.: HR 6902 (spectrum G9 IIb)
  • III e.g.: gigantes
    • IIIa, e.g.: ρ Persei (spectrum M4 IIIa)
    • IIIab, e.g.: δ Reticuli (spectrum M2 IIIab)
    • IIIb, e.g.: Pollux (spectrum K2 IIIb)
  • IV subgigantes
    • IVa, e.g.: ε Reticuli (spectrum K1-2 IVa-III)
    • IVb, e.g.: HR 672 A (spectrum G0.5 IVb)
  • V series capitalis
    • Va, e.g.: AD Leonis (spectrum M4Vae)
    • Vb, e.g.: 85 Pegasi A (spectrum G5 Vb)
  • VI suppumilionesи (rare)
  • VII pumilio alba (rare)

Classificatio Harvardiana definit Abscissam diagrammatis Hertzsprung — Russel, sed Yerkes classificatio — positionem stellae in diagrammate. Supplementaria autem praestantia huius classificationis est possibilitas definendi luminocitatem sellae (spectro cognoto), et propterea possibilitas aestimandi distantionem ad stellam.

Sol, pumilio flava, habet classem spectralem G2V.

Vide etiam

Formula:Link FA

  1. The Guinness book of astronomy facts & feats, Patrick Moore, 1992, 0-900424-76-1
  2. "The Colour of Stars". Australia Telescope Outreach and Education. December 21 2004  — Explains the reason for the difference in color perception.