Radiative transition rates and collision Radiative transition rates and collision strengths for the n=3,4,5,6,7,8 strengths for the n=3,4,5,6,7,8

configurations of Ca IIconfigurations of Ca IIM. Melendez M. Melendez 1,21,2; M.A. Bautista ; M.A. Bautista 33 & N.R. Badnell & N.R. Badnell 44

ITAMP WORKSHOP, August 7-9 2006

1IACS/CUA

2GSFC/NASA

3IVIC

4U. of Strathclyde, UK

Long linear, filamentary ejecta, known as “strings”, are found to move at very high velocity external to the Homunculus. The origin of the strings is a puzzle. Determining if their elemental abundances are similar to other ejecta linked with the brightening events of the 1840’s and the 1890’s, would give insight as to whether these ejecta originated in the outer atmosphere of the erupting star, or possibly much deeper.

Motivation

(Poster 114.11 AAS 207th)

7000 7500(Å)

6500 7000(Å)

2-D Spectra of the Strontium Filament and a portion of a string

Atomic Data

6

4 /exp1),( rr

rVpol

Model Potential (Norcross & Seaton 1976)

Dipole core Polarizability =3.31 =2.25

(Edlen & Risberg 1956)

Atomic Data

(a) w/o PI

(b) PI

1. R. N. Grosselin. et al (1988).

2. T. Andersen. et al (1970).

3. W. Ansbacher. et al (1985).

Scattering Calculations

4s 2S1/2 – 3d 2D 3/2

(a) 4s 2S1/2 – 3d 2D 3/2

(b) 4s 2S1/2 – 3d 2D 5/2

(c) 4s 2S1/2 – 4p 2P 1/2

(d) 4s 2S1/2 – 4p 2P 3/2

PIw/o PI

(a) 4s 2S1/2 – 3d 2D 3/2

(b) 4s 2S1/2 – 3d 2D 5/2

(c) 4s 2S1/2 – 4p 2P 1/2

(d) 4s 2S1/2 – 4p 2P 3/2

PIw/o PI

Scattering Calculations

Effective collision strengthsEffective collision strengths

4s-4p 5,000 K5,000 K 10,000 K10,000 K 15,000 K15,000 K 20,000 K20,000 K

11 15.615.6 17.517.5 19.219.2 20.820.8

22 24.8724.87 27.5027.50 29.8829.88 32.0432.04

w/o PIw/o PI 19.0319.03 20.8220.82 22.4522.45 24.0324.03

PIPI 17.0717.07 19.4419.44 21.4521.45 23.2323.23

1. Osterbrock & Wallace (1976), Taylor & Dunn (1973)

2. Burgess A. et. al (1995)

Line Ratios

ConclusionsConclusions

We have computed radiative data, collision strengths and effective collision We have computed radiative data, collision strengths and effective collision strengths for transitions among 45 levels from the n=3,4,5,6,7,8 strengths for transitions among 45 levels from the n=3,4,5,6,7,8 configurations of Ca II. configurations of Ca II.

We present an extensive comparison for the polarization contributionWe present an extensive comparison for the polarization contributionto the radiative transition and  electron impact excitation rates coefficients, to the radiative transition and  electron impact excitation rates coefficients, which can lead to  contributions of up to 20% in some cases with respectwhich can lead to  contributions of up to 20% in some cases with respectto the "unpolarize" frozen core model.to the "unpolarize" frozen core model.

The complete set of data obtained here allows us to build a non-LTE The complete set of data obtained here allows us to build a non-LTE collisional radiative model fo Ca II.collisional radiative model fo Ca II.

ObsObs    TermsTerms restrest VelVel FluxFlux

  ÅÅ       ÅÅ   Km sKm s-1-1 1010-15-15 ergs s ergs s-1-1 arcsec arcsec-1-1

5199.025199.02 [N I][N I] 44SS003/23/2 - - 22DD00

3/23/2 5205.765205.76 233233 17.1817.18

5761.365761.36 [N II][N II] 11DD22--11SS00 5756.195756.19 269269 10.2310.23

6556.236556.23 [N II][N II] 33PP11--11DD22 6549.866549.86 292292 130.79130.79

6570.146570.14 HH    6564.616564.61 253253 81.6181.61

6591.336591.33 [N II][N II] 33PP22 - - 11DD22 6585.276585.27 279279 353.03353.03

6725.906725.90 [S II][S II] 44SS3/23/2 - - 2 2DD5/25/2 6718.296718.29 340340 10.1010.10

6739.946739.94 [S II][S II] 44SS3/23/2 - - 22DD3/23/2 6732.676732.67 324324 18.2118.21

7164.227164.22 [Fe II][Fe II] aa44FF9/29/2 - a - a22GG9/29/2 7157.137157.13 297297 7.037.03

7300.537300.53 [Ca II][Ca II] 22SS1/21/2 - - 22DD5/25/2 7293.487293.48 290290 5.275.27

7332.487332.48 [Ca II][Ca II] 22SS1/21/2 - - 22DD3/23/2 7325.917325.91 269269 4.714.71

7386.717386.71 [Ni II][Ni II] aa22DD5/25/2 - a - a22FF7/27/2 7379.867379.86 278278 4.984.98

8627.768627.76 [Fe II][Fe II] aa44FF9/29/2 - a - a44PP5/25/2 8619.338619.33 293293 4.504.50

Line Identification for the String