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

at the end of 2002at the end of 2002

Nikolai Tomov, Mima Tomova Nikolai Tomov, Mima Tomova & Dmitry Bisikalo& Dmitry Bisikalo

The Symbiotic System Z AndThe Symbiotic System Z And

Components:

• A normalA normal M4.5 III giantM4.5 III giant

• A white dwarf with TA white dwarf with Teff eff 10 105 5 KK

• A partly photoionized surrounding nebulaA partly photoionized surrounding nebula

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 spectral energy distribution of Z And during The spectral energy distribution of Z And during quiescencequiescence

and at different epochs of its 2000 - 2003 active phaseand at different epochs of its 2000 - 2003 active phase

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

Parameters of the hot stellar and the nebular components

Parameters of the cool giantR = 85(d/1.12 kpc) R , Teff = 3400 K

DateDate Comp.Comp. TTeffeff (K) (K) R(d/1.12 kpc) (RR(d/1.12 kpc) (R)) TTee (K) (K) nnee2 2 V(d/1.12 V(d/1.12

kpc)kpc)22

10105959 (cm (cm-3-3))

15.09.1915.09.199999

QuiescenQuiescentt

Hot Hot Neb.Neb.

150000150000 0.060.062000020000100100

004.7 4.7 0.30.3

22.11.2022.11.200000

ActiveActive

Hot Hot Neb.Neb.

35000 35000 10001000 2.22 2.22 0.060.062000020000100100

0017.417.4 0.60.6

06.12.2006.12.200000

ActiveActive

Hot Hot Neb.Neb.

35000 35000 10001000 2.28 2.28 0.070.072000020000100100

0024.024.0 0.50.5

27.01.2027.01.200202

ActiveActive

Hot Hot Neb.Neb.

5800058000+2000/-+2000/-30003000

0.72+0.04/-0.030.72+0.04/-0.032000020000200200

003.43.4 0.40.4

19.08.2019.08.200202

QuiescenQuiescentt

Hot Hot Neb.Neb.

150000150000 0.060.062000020000100100

002.6 2.6 0.10.1

12.11.2012.11.200202

ActiveActive

Hot Hot Neb.Neb.

125000125000 0.13 0.13 0.010.012000020000100100

0011.7 11.7 0.30.3

04.08.2004.08.200303

QuiescenQuiescentt

Hot Hot Neb.Neb.

150000150000 0.060.062000020000100100

004.9 4.9 0.10.1

17.08.2017.08.200303

QuiescenQuiescentt

Hot Hot Neb.Neb.

150000150000 0.060.062000020000100100

004.8 4.8 0.10.1

06.10.2006.10.200303

QuiescenQuiescentt

Hot Hot Neb.Neb.

150000150000 0.060.062000020000100100

004.9 4.9 0.20.2

The HThe H and H and H lines in the quiescent lines in the quiescent statestate

The HThe H line during the outburst in 2002 line during the outburst in 2002

Flux in units erg cm-2 s-1

292.098x10-12

255.255x10-12

173.494x10-12

The HThe H line during the outburst in 2002 line during the outburst in 2002

The broad component of the HThe broad component of the H line line during during

the outburst in 2002the outburst in 2002

The data of the HThe data of the H line during the outburst in line during the outburst in 20022002

DateDate FWHM FWHM (N)(N)

Flux Flux (N)(N) FWHM (B)FWHM (B) FWZI FWZI

(B)(B)VVhh

Flux Flux (B)(B)

17.09.19917.09.19999

8080 39.52339.523

25.09.20025.09.20022

166166 15.71815.718 1014 1014 100100 19001900 950950 3.1933.193

20.10.20020.10.20022

165165 22.79622.796 1073 1073 7878 21002100 10501050 4.8854.885

12.11.20012.11.20022

171171 28.80028.800 1010 1010 7070 20302030 10201020 5.2365.236

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 HThe H and H and H lines lines

The profile of the HeII The profile of the HeII 4686 line during the 4686 line during the outburst in 2002outburst in 2002

The data of the HeII The data of the HeII 4686 line during the 4686 line during the outburst in 2002outburst in 2002

DateDate FWHM FWHM (N)(N)

Flux Flux (N)(N) FWHM (B)FWHM (B) FWZI FWZI

(B)(B)VVhh

Flux Flux (B)(B)

17.09.19917.09.19999

6464 39.35039.350

25.09.20025.09.20022

8787 46.31946.319 1091 1091 9292 21132113 10501050 3.7133.713

20.10.20020.10.20022

9292 59.78259.782 1170 1170 101101 22012201 11001100 5.2345.234

12.11.20012.11.20022

105105 70.11070.110 1192 1192 5656 24162416 12001200 6.6586.658

The mass-loss rate on November 12, 2002:Mdot = 1.7410-7 (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 rateThe mass-loss rate

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

Thank you for your Thank you for your attentionattention!!