Hubble Space Telescope observations of the windblown nebula NGC 7635

Brian D. Moore, Donald K. Walter, J. Jeff Hester, Paul Scowen, Reginald J. Dufour, Brent A. Buckalew

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We present Hubble Space Telescope observations of the northern part of NGC 7635, a circular shell around the O6.5 IIIf star BD +60°2522. The nebula, which lies within the large emission-line region S162, is notable not only for its symmetric shell, but also for a complex of "cometary" knots close to the central star. Our observations include spectra taken with the Space Telescope Imaging Spectrograph and narrowband images taken with the Wide Field Planetary Camera 2. The high spatial resolution of these data reveals the knots to be the ionized edges of a much larger mass of neutral material, with strong photoevaporative flows toward the central star. The cometary appearance of the knots is produced by the intersection of two ridges, one in the plane of the sky and the other 65° relative to it. Stratification in the emission from the shell can also be seen, the result of shock heating as material is swept into the expanding shell. We also see for the first time a small loop of emission between the central star and the cometary knot complex. We propose that this was formed by the collision between the strong stellar wind and the photoevaporative flow from the closest and brightest of these knots.

Original languageEnglish (US)
Pages (from-to)3313-3324
Number of pages12
JournalAstronomical Journal
Volume124
Issue number6 1764
DOIs
StatePublished - Dec 1 2002

Fingerprint

nebulae
Hubble Space Telescope
shell
stars
circular shells
shock heating
stellar winds
stratification
intersections
spectrographs
sky
narrowband
ridges
spatial resolution
collision
cameras
telescopes
heating
collisions
high resolution

Keywords

  • H II regions
  • ISM: individual (NGC 7635)
  • ISM: kinematics and dynamics
  • Stars: individual (BD +60°2522)
  • Stars: mass loss

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Moore, B. D., Walter, D. K., Hester, J. J., Scowen, P., Dufour, R. J., & Buckalew, B. A. (2002). Hubble Space Telescope observations of the windblown nebula NGC 7635. Astronomical Journal, 124(6 1764), 3313-3324. https://doi.org/10.1086/344596

Hubble Space Telescope observations of the windblown nebula NGC 7635. / Moore, Brian D.; Walter, Donald K.; Hester, J. Jeff; Scowen, Paul; Dufour, Reginald J.; Buckalew, Brent A.

In: Astronomical Journal, Vol. 124, No. 6 1764, 01.12.2002, p. 3313-3324.

Research output: Contribution to journalArticle

Moore, BD, Walter, DK, Hester, JJ, Scowen, P, Dufour, RJ & Buckalew, BA 2002, 'Hubble Space Telescope observations of the windblown nebula NGC 7635', Astronomical Journal, vol. 124, no. 6 1764, pp. 3313-3324. https://doi.org/10.1086/344596
Moore BD, Walter DK, Hester JJ, Scowen P, Dufour RJ, Buckalew BA. Hubble Space Telescope observations of the windblown nebula NGC 7635. Astronomical Journal. 2002 Dec 1;124(6 1764):3313-3324. https://doi.org/10.1086/344596
Moore, Brian D. ; Walter, Donald K. ; Hester, J. Jeff ; Scowen, Paul ; Dufour, Reginald J. ; Buckalew, Brent A. / Hubble Space Telescope observations of the windblown nebula NGC 7635. In: Astronomical Journal. 2002 ; Vol. 124, No. 6 1764. pp. 3313-3324.
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