Stea pitică

Acest articol se referă la stea pitică. Pentru alte sensuri, vedeți Pitică (dezambiguizare).
Reprezentare artistică a stelei 51 Pegasi (care este o pitică galbenă) și a planetei 51 Pegasi b.

Termenul stea pitică se referă la o varietate de tipuri de stele:

  • dacă se folosește doar stea pitică atunci se referă în general la orice stea din secvența principală care aparține clasei a V-a de luminozitate.
  • pitică albastră - se referă la stelele cu masă mică din secvența principală, despre care se presupune că dau naștere la stelele tip pitică roșie
  • pitică albă - este o stea formară din materie având electronii-degenerați, este considerată a fi ultima etapă în evoluția unei stele care nu este masivă înainte de a forma o stea supernovă de tip II-stele masive care au aproximativ 9 mase solare
  • pitică neagră - se referă la o stea pitică albă care s-a răcit suficient astfel încât ea nu mai emite nicio lumină vizibilă.
  • pitică cenușie - se referă la un obiect sub-stelar cu o masă mai mică decât este necesar pentru a menține arderea hidrogenului în heliu (cca. din 0,08 masa solară) , așa cum sunt stele din secvența principală, dar care are suprafața și interiorul total convective, fără nici o diferențiere chimică în profunzime.
Vă rugăm să contribuiți la îmbunătățirea articolului ajutând la extinderea lui. Informații suplimentare pot fi găsite pe pagina de discuții.

Vezi și

Note

  1. ^ published, Elizabeth Howell (), 'Orange dwarfs' may be the best stars to study in search for life (în engleză), Space.com 

Legături externe

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Soarele
Structura internă
Atmosfera
Variații solare
Heliosfera
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Tip: pitică galbenă · Clasa spectrală: G2V · Categorie Soare · Portal Portal Sistemul solar · Portal Portal Astronomie · Portal Portal Soare

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