Ha¡ um grupo especial de minaºsculas bestas vermelhas vagando pela gala¡xia da Via La¡ctea. Elas são estrelas subana£s vermelhas que são 'aboragenes' da Via La¡ctea e consideradas nascidas no halo gala¡ctico e no disco espesso.
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Comparação entre um subanão M e o sol. Crédito: LAMOST
Ha¡ um grupo especial de minaºsculas bestas vermelhas vagando pela gala¡xia da Via La¡ctea. Elas são estrelas subana£s vermelhas que são 'aboragenes' da Via La¡ctea e consideradas nascidas no halo gala¡ctico e no disco espesso.Â
"Aprender mais sobre essas subana£s M pode nos ajudar a conhecer a história de nossa gala¡xia. Eles são realmente muito raros na vizinhana§a solar, mas as pessoas geralmente os misturavam com algumas ana£s vermelhas nascidas em disco, pobres em metal ", disse o Prof. Luo Ali dos Observatórios Astrona´micos Nacionais da Academia Chinesa de Ciências (NAOC). A equipe do Prof. Luo tem feito pesquisas aprofundadas sobre os subdwarfs M. Â
A equipe de pesquisa estudou as propriedades de milhares de subana£s para compreender a diferença intranseca entre esses escassos subanaµes M e os anaµes M normais, que são os membros estelares mais numerosos da Via La¡ctea. Â
Seu estudo foi publicado no The Astrophysical Journal . Â
"Revisamos o sistema de classificação espectrosca³pica e medimos os parametros atmosfanãricos de todas as amostras de anaµes / subanaµes. Os resultados mostram que o novo sistema se comporta melhor ao encontrar os pequenos animais vermelhos, que são os subanaµes genuanos", disse Zhang Shuo, o primeiro autor do estudo. Â
Os pesquisadores estudaram os efeitos da revisão no sistema de classificação que foi aplicado a s amostras espectrosca³picas da subdwarf selecionadas do LAMOST e SDSS. Eles descobriram que as subana£s "genuanas" identificadas pela luminosidade e movimento são aquelas com as menores abunda¢ncias de metal e também tem a maior gravidade, o que não era considerado uma característica das estrelas subana£s.Â
"Por décadas, as pessoas se referiram coletivamente a s subana£s reais e a um grupo de ana£s pobres em metal como 'subana£s' com base em algumas caracteristicas espectrais especaficas, mas esses objetos estelares classificados erroneamente se comportam como ana£s de disco cla¡ssicas em todos os aspectos", disse Zhang Shuo. "Descobrimos que o valor da gravidade éum a³timo critanãrio para separa¡-los dos subanaµes genuanos."Â Â
"A maior amostra de estrelas subana£s M que construamos nos ajudou a fazer esta importante descoberta. Mais importante, a análise cinema¡tica e química mostra que a amostra contanãm uma mistura de objetos pertencentes a várias populações estelares e com origens diferentes, o que merece um estudo mais aprofundado ", disse o Prof. Luo. Â