THE SPATIALLY RESOLVED BIPOLAR NEBULA OF SAKURAI'S OBJECT

Sakurai's object (V4334 Sgr), the final flash object discovered in the mid-1990s, underwent rapid cooling during the first decade of the 21st century becoming as faint as K ~ 25. This stage of evolution has ceased. Between observations in 2010 September and 2013 April V4334 Sgr brightened >2...

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Bibliographic Details
Published in:The Astrophysical journal 2014-04, Vol.785 (2), p.1-12
Main Authors: Hinkle, Kenneth H, Joyce, Richard R
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ASYMMETRY
Clouds
COOLING
Debris
DEUTERIUM IONS
DISTANCE
DUSTS
EMISSION
ENERGY SPECTRA
EXPANSION
Globules
Helium
INTERACTIONS
MASS TRANSFER
Nebulae
OXYGEN 13
PLANETARY NEBULAE
Spectral emissivity
Spectral energy distribution
STAR EVOLUTION
STARS
STELLAR WINDS
VELOCITY
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Summary:Sakurai's object (V4334 Sgr), the final flash object discovered in the mid-1990s, underwent rapid cooling during the first decade of the 21st century becoming as faint as K ~ 25. This stage of evolution has ceased. Between observations in 2010 September and 2013 April V4334 Sgr brightened >2 mag to K = 14.2 and the effective temperature increased to ~590 K. AO images show a central source and two extended globules defining a 13[degrees] position angle. The globules span a spatial extent of ~0".3 in 2013. This spatial extent is consistent with sizes derived from spectral energy distributions taken over the previous decade and a debris cloud expanding at 0.055 mas d super(-1) since late 1998. Near-simultaneous 0.85-2.5 mu m spectra reveal helium lines attributed to a wind-interaction shock. The He I 1.0830 mu m emission has a spectral width of ~1000 km s super(-1) and a spatial extent of ~1".4. The helium shell is fragmented, spatially asymmetric, and five times larger than the dust debris cloud. [CI] and [NI] forbidden lines are present in the 1 mu m region spectrum. The forbidden line spectrum is similar to that of proto-planetary nebulae. The [CI] 9850 A line is spatially extended. The expansion velocity and change of angular size limit the distance to 2.1-3.7 kpc.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/785/2/146