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BD+60°2522 is a bright O-type star that has produced the Bubble Nebula (NGC 7635) with its stellar wind. The exact classification of the star is uncertain, with a number of spectral peculiarities and inconsistencies between the appearance of the star itself and the effects on the nearby nebulosity, but it is undoubtedly a highly luminous hot massive star.[5] Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around 37,500 K. It is a member of the Cassiopeia OB2 stellar association in the Perseus Arm[7] of the galaxy at about 8,500 light-years' distance.[8]

BD+60°2522

NGC 7635 surrounding BD+60 2522
Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 23h 20m 44.5135s[1]
Declination +61° 11′ 40.531″[1]
Apparent magnitude (V) 8.67[2]
Characteristics
Spectral type O6.5(f)(n)p[3]
U−B color index −0.62[2]
B−V color index +0.41[2]
Astrometry
Radial velocity (Rv)−26[4] km/s
Proper motion (μ) RA: −2.662[1] mas/yr
Dec.: 0.388[1] mas/yr
Parallax (π)0.3341 ± 0.0152 mas[1]
Distance9,800 ± 400 ly
(3,000 ± 100 pc)
Absolute magnitude (MV)−5.5[5]
Details[6]
Mass44 M☉
Radius15 R☉
Luminosity398,000 L☉
Temperature37,500 K
Rotational velocity (v sin i)178 - 240 km/s
Age2[7] Myr
Other designations
SAO 20575 IRAS 23185+6055 2MASS J23204452+6111404
Database references
SIMBADdata

Although BD+60°2522 is around two million years old, the surrounding nebula is apparently only about 40,000 years old. The bubble is expected to be formed as a shock front where the stellar wind meets interstellar material at supersonic speeds. The wind from BD+60°2522 is travelling outwards at 1,800–2,500 km/s, causing the star to lose over a millionth of the mass of the Sun every year.[7]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; St-Louis, Nicole; Fariña, Cecilia; Bosch, Guillermo L.; Morrell, Nidia I.; Barbá, Rodolfo H.; Van Loon, Jacco Th. (2010). "The Onfp Class in the Magellanic Clouds". The Astronomical Journal. 139 (3): 1283. arXiv:1001.4032. Bibcode:2010AJ....139.1283W. doi:10.1088/0004-6256/139/3/1283. S2CID 119297513.
  4. Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. ISBN 9780598216885. LCCN 54001336.
  5. Moore, B. D.; Walter, D. K.; Hester, J. J.; Scowen, P. A.; Dufour, R. J.; Buckalew, B. A. (2002). "Hubble Space Telescope Observations of the Windblown Nebula NGC 7635". The Astronomical Journal. 124 (6): 3313. Bibcode:2002AJ....124.3313M. doi:10.1086/344596.
  6. Rauw, G.; De Becker, M.; Vreux, J. -M. (2004). "Line profile variability in the spectra of Oef stars". Astronomy and Astrophysics. 399: 287–296. arXiv:astro-ph/0408253. Bibcode:2003A&A...399..287R. doi:10.1051/0004-6361:20021776.
  7. Anand, M. Y.; Kagali, B. A.; Murthy, Jayant (2009). "Study of Bubble nebula using IUE high resolution spectra". Bulletin of the Astronomical Society of India. 37 (1): 1. arXiv:0903.2828. Bibcode:2009BASI...37....1A.
  8. Mason, Brian D.; Hartkopf, William I.; Gies, Douglas R.; Henry, Todd J.; Helsel, John W. (2009). "The High Angular Resolution Multiplicity of Massive Stars". The Astronomical Journal. 137 (2): 3358. arXiv:0811.0492. Bibcode:2009AJ....137.3358M. doi:10.1088/0004-6256/137/2/3358. S2CID 119268845.

На других языках

- [en] BD+60°2522

[es] SAO 20575

SAO 20575 (BD+60 2522 / TYC 4279-1582-1) es la estrella central de la Nebulosa Burbuja (NGC 7635), situada en la constelación de Casiopea. Al no figurar en el catálogo Henry Draper, es comúnmente conocida por su número de catálogo SAO y Bonner Durchmusterung. Observaciones realizadas con el Far Ultraviolet Spectroscopic Explorer (FUSE) muestran que es la estrella responsable de iluminar la región H II S162, y que su viento estelar ha limpiado algo del material dentro de ella dando lugar a una envoltura esferoidal.[2]


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