MASS EJECTION FROM THE SYMBIOTIC PROTOTYPE Z And DURING ITS 2006 OUTBURST

作者：Tomov N A^*; Tomova M T; Bisikalo D V

来源：Baltic Astronomy, 2012, 21(1-2): 112-122.

• stars: binaries: symbiotic
• stars: activity, mass-loss, winds, outflows
• stars: individual (Z And)

High-resolution spectroscopic observations in the region of the Balmer H alpha and H gamma lines of the symbiotic binary Z And were performed during its major eruption in 2006. The H alpha line had additional satellite high-velocity components situated on either side of its central peak which indicated bipolar collimated outflow from the compact object. The H gamma line presented three components, consisting of a central narrow emission, a broad emission component with low intensity indicating an optically thin stellar wind with a velocity of about 500 km s(-1) from the compact object and a blueshifted P Cyg absorption with a multi-component structure occupying a broad velocity range. These data are explained in light of a model where a disk-like envelope surrounding the accretion disk collimates the stellar wind on the compact object and gives rise to bipolar outflow. The mass-loss rate of the accretor was derived at several epochs after outburst. We conclude that the mass-loss rate has decreased probably from 4-5 x 10(-7) (d/1.12kpc)(3/2) M-circle dot yr(-1) at the time of maximum light to about 2 x 10(-7) (d/1.12kpc)M-3/2(circle dot) yr(-1) in 2006 December.

• 出版日期2012
• 单位中国科学院国家天文台