2009A&A...493L..17C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST11:47:30

2009A&A...493L..17C - Astronomy and Astrophysics, volume 493, L17-20 (2009/1-2)

A dense disk of dust around the born-again Sakurai's object.

CHESNEAU O., CLAYTON G.C., LYKOU F., DE MARCO O., HUMMEL C.A., KERBER F., LAGADEC E., NORDHAUS J., ZIJLSTRA A.A. and EVANS A.

Abstract (from CDS):

In 1996, Sakurai's object (V4334 Sgr) suddenly brightened in the center of a faint Planetary Nebula (PN). This very rare event was interpreted as being the reignition of a hot white dwarf that caused a rapid evolution back to the cool giant phase. From 1998 on, a copious amount of dust has formed continuously, screening out the star that remained embedded in this expanding high optical-depth envelope. We present observations that we use to study the morphology of the circumstellar dust to investigate the hypothesis that Sakurai's Object is surrounded by a thick spherical envelope of dust. We acquired unprecedented, high angular-resolution, spectro-interferometric observations, with the mid-IR interferometer MIDI/VLTI, which resolved the dust envelope of Sakurai's object. We report the discovery of a unexpectedly compact (30x40 milliarcsec, 105x140AU assuming a distance of 3.5kpc), highly inclined, dust disk. We used Monte Carlo radiative-transfer simulations of a stratified disk to constrain its geometric and physical parameters, although such a model is only a rough approximation of the rapidly evolving dust structure. Even though the fits are not fully satisfactory, some useful and robust constraints can be inferred. The disk inclination is estimated to be 75°±3° with a large scale height of 47±7AU. The dust mass of the disk is estimated to be 6x10–5M. The major axis of the disk (132°±3°) is aligned with an asymmetry seen in the old PN which was re-investigated as part of this study. This implies that the mechanism responsible for shaping the dust envelope surrounding Sakurai's object was already at work when the old PN formed.

Abstract Copyright:

Journal keyword(s): ISM: planetary nebulae: individual: Sakurai's object - stars: AGB and post-AGB - stars: circumstellar matter - stars: mass-loss - techniques: high angular resolution - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/493/L17): table1.dat fig/*>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PN A66 30 PN 08 46 53.4640384491 +17 52 46.368019418   14.23 14.30 13.47   [WC5] 386 0
2 HD 89353 pA* 10 18 07.5892879413 -28 59 31.194541133   5.76 5.53     B9.5Ib/II 289 0
3 * zet02 Sco PM* 16 54 35.0043467 -42 21 40.740679   4.99 3.62     K3III 70 0
4 V* V4334 Sgr CV* 17 52 32.69 -17 41 08.0   12.01       F2Ia 338 0
5 HD 163376 V* 17 57 47.8033772 -41 42 58.661213   6.503 4.863     M0III 45 0
6 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 262 0
7 * tau Sgr PM* 19 06 56.4052936935 -27 40 13.609432896 5.65 4.51 3.31 2.44 1.85 K1.5IIIb 148 0
8 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 293 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-11:47:30

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