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Loss of mass by the symbiotic binary Z And during its outburst at the end of 2002PowerPoint Presentation

Loss of mass by the symbiotic binary Z And during its outburst at the end of 2002

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Loss of mass by the symbiotic binary Z And during its outburst at the end of 2002

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Loss of mass by the symbiotic binary Z And during its outburst at the end of 2002

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Loss of mass by the symbiotic binary Z And during its outburst at the end of 2002

Nikolai Tomov, Mima Tomova

& Dmitry Bisikalo

- A normalM4.5 III giant
- A white dwarf with Teff 105 K
- A partly photoionized surrounding nebula

Components:

Active phases of Z And:

After 1915, 1939, 1960, 1984 and 2000.

The light curve of Z And

during its last active phase after 2000

The dots indicate the data of Skopal et al. 2002, 2004, Skopal & Pribulla 2006

and Skopal & Wolf 2006. The squares indicate our data.

The points indicate the observed fluxes. The thin lines represent the continua of the system’s components. The circles represent the UBVRI fluxes of the giant. The thick line represents the resulting continuum. In the region of the BVRI photometric bands the resulting continuum is represented by crosses, placed only at their positions, since the giant does not radiate as a blackbody in this region and its continuum has not been known at the other wavelengths. Flux units are erg cm-2 s-1 A-1.

Parameters of the hot stellar and the nebular

components

Parameters of the cool giant

R = 85(d/1.12 kpc)R ,Teff = 3400 K

Flux in units erg cm-2 s-1

292.098x10-12

255.255x10-12

173.494x10-12

The fluxes are in units of 10-12 erg cm-2 s-1. The other quantities are in units of km s-1.

The mass-loss rate on November 12, 2002:

Mdot = 1.9510-7 (d/1.12 kpc)3/2 M yr-1

The fluxes are in units of 10-12 erg cm-2 s-1. The other quantities are in units of km s-1.

The mass-loss rate on November 12, 2002:

Mdot = 1.7410-7 (d/1.12 kpc)3/2 M yr-1

Mdot = 1.8 10-7 (d/1.12 kpc)3/2 M yr-1

Thank you for your attention!