VdB 49


vdB 49
Nebulosa a riflessione
vdB 49
Dati osservativi
(epoca J2000)
CostellazioneOrione
Ascensione retta05h 39m 11s[1]
Declinazione+04° 07′ 17″[1]
Coordinate galattichel = 200,7; b = -14,0[2]
Distanza1488 a.l.
(456 pc)
Magnitudine apparente (V)4,46 (stella centrale)[2]
Dimensione apparente (V)21' x 21'[2]
Caratteristiche fisiche
TipoNebulosa a riflessione
Mappa di localizzazione
VdB 49
Categoria di nebulose a riflessione

vdB 49 è una nebulosa a riflessione visibile nella costellazione di Orione.

L'individuazione della sua posizione non presenta difficoltà: si può partire dalla congiungente di Betelgeuse e Bellatrix, fermarsi a metà strada e proseguire a sud in direzione della Cintura di Orione, fino a trovare una stella di quarta magnitudine, catalogata come ω Orionis, che è la stella responsabile dell'illuminazione della nebulosa; si tratta di una gigante blu di classe spettrale B3IIIe, ossia una stella Be, la cui parallasse pari a 2,19±0,93 mas[3] corrisponde a una distanza di circa 456 parsec (poco meno di 1500 anni luce). L'oggetto viene a trovarsi sul bordo dell'Anello di Barnard, una grande nebulosa a forma di semicerchio con centro posto approssimativamente nella nebulosa di Orione; la struttura sarebbe causata dall'espansione di una superbolla generata dal forte vento stellare combinato delle stelle più massicce dell'associazione OB Orion OB1b, le cui pareti più prossime al sistema solare corrispondono alla Bolla di Eridano.[4]

Note

  1. ^ a b Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 15 ottobre 2009.
  2. ^ a b c van den Bergh, S., A study of reflection nebulae., in Astronomical Journal, vol. 71, dicembre 1966, pp. 990-998, DOI:10.1086/109995. URL consultato il 14 ottobre 2009.
  3. ^ VizieR services - star catalogues, su result for Omega Orionis. URL consultato il 22 ottobre 2009.
  4. ^ Reynolds, R. J.; Ogden, P. M., Optical evidence for a very large, expanding shell associated with the I Orion OB association, Barnard's loop, and the high galactic latitude H-alpha filaments in Eridanus, in Astrophysical Journal, vol. 229, maggio 1979, pp. 942-953, DOI:10.1086/157028. URL consultato il 19 luglio 2009.

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