VdB 150


vdB 150
Nebulosa a riflessione
vdB 150
Scoperta
ScopritoreAnnie Jump Cannon
Edward Pickering
Data1918
Dati osservativi
(epoca J2000)
CostellazioneCefeo
Ascensione retta22h 09m 40s[1]
Declinazione+73° 23′ 27″[1]
Coordinate galattichel = 111,9; b = +14,1[2]
Distanza1006 a.l.
(308 pc)
Magnitudine apparente (V)8,35 (stella centrale)[2]
Dimensione apparente (V)5,7' x 5,7'[2]
Caratteristiche fisiche
TipoNebulosa a riflessione
Mappa di localizzazione
VdB 150
Categoria di nebulose a riflessione

vdB 150 è una nebulosa a riflessione visibile nella costellazione di Cefeo.

Si trova a circa un terzo della separazione angolare che intercorre fra le stelle Alfirk (β Cephei) e Alrai (γ Cephei), in una regione ricca di nubi molecolari oscure; in particolare, vdB 150 rappresenta una sezione illuminata della grande nebulosa oscura LDN 1235, a cui apparentemente apparterrebbe anche la vicina nebulosa vdB 149.[3] La stella responsabile dell'illuminazione della regione è HD 210806, una stella subgigante di classe spettrale B8IV, che imprime ai gas illuminati un colore marcatamente bluastro; la sua parallasse è di 3,24±0,63 mas,[4] cui corrisponde una distanza di circa 308 parsec (1006 anni luce). La nube è formata da polveri fredde, ben visibili nelle osservazioni condotte all'infrarosso e rilevate dall'IRAS.[3]

La nebulosa che comprende questa e la vicina vdB 150, LDN 1235 è probabilmente una cosiddetta nebulosa a emissione rossa, ossia una nube posta alle alte latitudini galattiche che diventa visibile grazie al campo di radiazione interstellare, con una bassa luminosità superficiale e dunque dall'aspetto oscuro se osservata nella banda della luce visibile.[5]

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. ^ a b Kun, M.; Vinkó, J.; Szabados, L., Star formation in the Cepheus Flare region - II. A-type stars associated with IRAS sources, in Monthly Notices of the Royal Astronomical Society, vol. 319, n. 3, dicembre 2000, pp. 777-790, DOI:10.1046/j.1365-8711.2000.03803.x. URL consultato il 22 ottobre 2009.
  4. ^ VizieR services - star catalogues, su result for HD 38023. URL consultato il 23 ottobre 2009.
  5. ^ Universe Today - Revealing The Undiscovered – van den Bergh 149/50 and Lynds Dark Nebula 1235, su universetoday.com. URL consultato il 12 novembre 2009.

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