Variável Órion

Uma variável Órion é uma estrela variável que exibe variações irregulares e eruptivas em sua luminosidade e é tipicamente associada a nebulosas difusas. Acredita-se que essas sejam estrelas jovens em via de se tornarem regulares na sequência principal. As variações de brilho podem chegar a várias magnitudes.

Estrelas T Tauri são variáveis Órion que exibem linhas de emissão violeta fluorescente características de átomos de ferro (Fe II) individuais em seus espectros estelares, e também emissão de lítio, um metal que é geralmente destruído pela fusão nuclear nas estrelas.

Estrelas Fu Orionis ou abreviadamente "Fuors", são variáveis Órion cujo brilho aumenta em 5-6 magnitudes, diminuindo para uma magnitude e assim permanecendo por décadas. O protótipo dessa classe é FU Orionis, e outros exemplos incluem V1057 Cygni e V1515 Cygni.

Nessa diversa classe de estrelas, algumas variáveis Órion podem exibir uma pequena amplitude (acima de 1 magnitude) na variação periódica, algumas são caracterizadas por uma diminuição no brilho abrupta, e outras exibem características espectrais indicando influxo de massa para a estrela (estrelas YY Orionis). Muitas dessas características podem ocorrer em qualquer variável Órion.

Referências

Samus N.N., Durlevich O.V., et al. Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)

Ligações externas

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