The Interstellar Medium Interactions of a Runaway Luminous Blue Variable Nebula in the Large Magellanic Cloud | Zendy

Charles Danforth | Zendy; YouHua Chu | Zendy

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The Interstellar Medium Interactions of a Runaway Luminous Blue Variable Nebula in the Large Magellanic Cloud

Author(s) -

Charles Danforth,

YouHua Chu

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/320341

Subject(s) - physics , astrophysics , interstellar medium , large magellanic cloud , astronomy , nebula , spectral line , luminous blue variable , supernova , stars , galaxy

New observations of the Magellanic Cloud Luminous Blue Variable candidateS119 (HD269687) show the relationship of the star to its environs. Echellespectroscopy and high-resolution HST imagery reveal an expanding bubblecentered on the star. This bubble appears in both Halpha and [NII] and isnoticeably brighter on the near (blue-shifted) side. The systemic velocity ofboth the expanding bubble and the star itself (as seen by the very broad Halphaemission feature in the stellar spectrum) is V_hel=160 km/s whereas thevelocity of the superposed LMC ISM is 250-300 km/s. ISM absorption featuresseen in FUSE spectra reveal components at both stellar and LMC velocities. Thuswe conclude that S119 is located within the LMC ISM and that the bubble isinteracting strongly with the ISM in a bow shock.

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