Stella EX Lupi

Rappresentazione artistica di EX Lupi, prototipo di questa classe di variabili.

Le stelle EX Lupi (variabili EX Lupi, dette anche EXor o SubFUor) sono una classe di stelle pre-sequenza principale che mostrano dei repentini aumenti di luminosità.

Si tratta di giovani stelle T Tauri di classe spettrale K o M.[1] Gli improvvisi aumenti di luminosità portano l'oggetto ad aumentare la propria magnitudine di 1–4 unità e possono durare per circa 10–100 giorni. La loro origine è attribuita, come nel caso dei FUor, a un'esplosione dovuta a un cambiamento nel tasso di accrescimento della stella a partire dal disco circumstellare.[1]

Tra un'esplosione e l'altra generalmente intercorrono alcuni mesi.

Note

  1. ^ a b J. A. Acosta-Pulido, M. Kun, P. Ábrahám, Á. Kóspál, S. Z. Csizmadia, et al, The 2004-2006 Outburst and Environment of V1647 Ori, in The Astronomical Journal, vol. 133, maggio 2007, pp. 2020-2036. URL consultato l'8-7-2009.

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