Sh2-80

Sh2-80
Regione H II
Sh2-80
Dati osservativi
(epoca J2000)
CostellazioneFreccia
Ascensione retta19h 11m 31s[1]
Declinazione+16° 51′ 38″[1]
Coordinate galattichel = 50,20; b = +03,31[1]
Distanza10920[2] a.l.
(3350[2] pc)
Magnitudine apparente (V)11,50[1]
Dimensione apparente (V)2' x 2'
Caratteristiche fisiche
TipoRegione H II
Classe3 2 3[3]
Dimensioni12,1 a.l.
(3,7 pc)
Caratteristiche rilevanticirconda la Stella di Merrill
Altre designazioni
LBN 127; PK 050+03.1; PN VV 220; M1–67[1]
Mappa di localizzazione
Sh2-80
Categoria di regioni H II

Sh2-80 è una regione H II visibile nella costellazione della Freccia.

Si individua nella parte occidentale della costellazione, a breve distanza dal confine con l'Aquila e sulla congiungente l'Attaccapanni e la stella ζ Aquilae; si estende per 2 minuti d'arco in direzione di una regione della Via Lattea con ricchi campi stellari di fondo. Il periodo più indicato per la sua osservazione nel cielo serale ricade fra giugno e novembre; trovandosi a circa 16° dall'equatore celeste può essere osservata da tutte le regioni popolate della Terra, sebbene gli osservatori dell'emisfero boreale siano più avvantaggiati.

Si tratta di una nebulosa a bolla che circonda la stella di Wolf-Rayet WR 124, nota anche con l'appellativo di Stella di Merrill o con la sigla di stella variabile QR Sge; la magnitudine apparente di questa stella è pari a 11,5[1] e la sua distanza è stata stimata attorno ai 3350 parsec (circa 10920 anni luce), sebbene altre stime indichino una distanza pari a 6400 parsec (oltre 20000 anni luce).[4] Questa nebulosa è stata generata dall'espulsione di materia dalla superficie della stella, un fenomeno tipico delle stelle di Wolf-Rayet, tanto che molte di esse sono circondate da involucri nebulosi; l'espansione di Sh2-80 è stata calcolata attorno ai 42-46 km/s.[5] Studi e cataloghi datati agli anni ottanta e novanta si riferiscono a questa nebulosa come a una nebulosa planetaria, come è testimoniato anche dalle nomenclature alternative presenti nel database SIMBAD;[1] sullo stesso catalogo Sharpless è presente un'annotazione che indica la possibilità che si tratti di una nebulosa planetaria.[3]

Note

  1. ^ a b c d e f g Simbad Query Result, su simbad.u-strasbg.fr. URL consultato il 16 settembre 2011.
  2. ^ a b van der Hucht, K. A., The VIIth catalogue of galactic Wolf-Rayet stars, in New Astronomy Reviews, vol. 45, n. 3, febbraio 2001, pp. 135-232, DOI:10.1016/S1387-6473(00)00112-3. URL consultato il 16 settembre 2011.
  3. ^ a b Sharpless, Stewart, A Catalogue of H II Regions., in Astrophysical Journal Supplement, vol. 4, dicembre 1959, p. 257, DOI:10.1086/190049. URL consultato il 16 settembre 2011.
  4. ^ Nugis, T.; Lamers, H. J. G. L. M., Mass-loss rates of Wolf-Rayet stars as a function of stellar parameters, in Astronomy and Astrophysics, vol. 360, agosto 2000, pp. 227-244. URL consultato il 16 settembre 2011.
  5. ^ Marchenko, S. V.; Moffat, A. F. J.; Crowther, P. A., Population I Wolf-Rayet Runaway Stars: The Case of WR124 and its Expanding Nebula M1-67, in The Astrophysical Journal Letters, vol. 724, n. 1, novembre 2010, pp. L90-L94, DOI:10.1088/2041-8205/724/1/L90. URL consultato il 16 settembre 2011.

Bibliografia

Voci correlate

Collegamenti esterni

  • Sky-Map.org - Sharpless Catalogue (from 71 to 80) [collegamento interrotto], su galaxymap.org.
  Portale Oggetti del profondo cielo: accedi alle voci di Wikipedia che trattano di oggetti non stellari

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