The evolution of V4334 Sgr (Sakurai's object) in the Mid-Infrared

Details The evolution of V4334 Sgr (Sakurai's object) in the Mid-Infrared The evolution of V4334 Sgr (Sakurai's object) in the Mid-Infrared

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406..981k&link_type=abstract

Astronomy and Astrophysics, v.406, p.981-985 (2003)

Astronomy and Astrophysics

Astrophysics

4

Stars: Agb And Post-Agb, Stars: Evolution, Circumstellar Matter, Planetary Nebulae: Individual: Sakurai'S Object (V4334 Sgr)

Scientific paper

Since Sakurai's object (V4334 Sgr) underwent a late helium flash in 1995, its fast evolution has been monitored with great effort. We present TIMMI and TIMMI 2 photometric observations covering a spectral range from 5 to 20 μ m with a total of 8 filters. We found drastic changes in the spectral energy distribution indicating a drop of temperature in the dust envelope from 1000 to 600 K in half a year only. Combined with optical observations reported elsewhere, we conclude that the phase of dust formation has probably stopped in mid-2001 and that the dusty envelope has been expanding only, ever since. An expansion velocity of about 1000 km s-1 is required to explain the rapid cooling. Other optical and near-infrared observations support the existence of such high velocity flows in the envelope of V4334 Sgr. An estimate for the bolometric luminosity of ~2000 L_sun is derived for a distance of 1 kpc. Taking into account theoretical models a distance of 2 +/- 1 kpc to V4334 Sgr is suggested. As a consequence of its fast final helium flash evolution, Sakurai's object may start to destroy its surrounding dust in the not too distant future.
Based on observations collected at the European Southern Observatory, Chile, proposals 65.L-0702, 67.D-0413, 68.D-0542.

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