Disk evaporation in a planetary nebula

Details Disk evaporation in a planetary nebula Disk evaporation in a planetary nebula

2010-01-29

arxiv.org/abs/1001.5387v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, accepted for publication in "Astronomy and Astrophysics"

Scientific paper

10.1051/0004-6361/200913543

We study the Galactic bulge planetary nebula M 2-29 (for which a 3-year eclipse event of the central star has been attributed to a dust disk) using HST imaging and VLT spectroscopy, both long-slit and integral field. The central cavity of M 2-29 is filled with a decreasing, slow wind. An inner high density core is detected, with radius less than 250 AU, interpreted as a rotating gas/dust disk with a bipolar disk wind. The evaporating disk is argued to be the source of the slow wind. The central star is a source of a very fast wind (1000 km/s). An outer, partial ring is seen in the equatorial plane, expanding at 12 km/s. The azimuthal asymmetry is attributed to mass-loss modulation by an eccentric binary. M 2-29 presents a crucial point in disk evolution, where ionization causes the gas to be lost, leaving a low-mass dust disk behind.

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