Line Identification and Temperature Diagnostics of Eta Carina's Sr-Filament
(2013) In Lund Observatory Examensarbeten ASTK01 20122Lund Observatory - Has been reorganised
- Abstract
- This bachelor thesis concerns the NIR spectral region of the Sr-filament, a substructure of the fan located in the equatorial skirt of Eta Carinae. The primary objective was to identify emission features intrinsic to the Sr-filament, and to tabulate these in a line-list spanning the spectral range λλ990 − 2410 nm. A secondary objective was concerned with the use of identified parity-forbidden atomic transitions for temperature diagnostics. The thesis is based on a long-slit NIR spectrum at resolution R approx. 10500, obtained using the ESO X-Shooter instrument at VLT. Centred on the Sr-filament, at a position offset 2.0 arcsec NW of the central object, the target is sampled during the recovery phase of Eta Carinae’s spectroscopic cycle.... (More)
- This bachelor thesis concerns the NIR spectral region of the Sr-filament, a substructure of the fan located in the equatorial skirt of Eta Carinae. The primary objective was to identify emission features intrinsic to the Sr-filament, and to tabulate these in a line-list spanning the spectral range λλ990 − 2410 nm. A secondary objective was concerned with the use of identified parity-forbidden atomic transitions for temperature diagnostics. The thesis is based on a long-slit NIR spectrum at resolution R approx. 10500, obtained using the ESO X-Shooter instrument at VLT. Centred on the Sr-filament, at a position offset 2.0 arcsec NW of the central object, the target is sampled during the recovery phase of Eta Carinae’s spectroscopic cycle. 300 emission features spectrally separated the Sr-filament from other sub-structures. Out of these, 144 lines were identified. One Zr II line and two Co II lines are identified, but not confirmed by previous studies. The resulting line-list indicates that the NIR spectrum of the S filament is dominated by CaI, TiII and FeI emission, accounting for 75% of the identified features. [TiII] lines are proposed as candidates for temperature diagnostics due to a span in excitation energy and wavelength. However, a lack of reference atomic transition probabilities prevented numerical calculations being conducted. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/3802854
- author
- Rhodin, Henrik LU
- supervisor
- organization
- course
- ASTK01 20122
- year
- 2013
- type
- M2 - Bachelor Degree
- subject
- keywords
- η Carinae, Sr-Filament, X-Shooter, Near-Infrared (NIR) Spectra, line list, forbidden lines, Boltzmann Plot, Temperature Diagnostics
- publication/series
- Lund Observatory Examensarbeten
- report number
- 2013-EXA73
- language
- English
- id
- 3802854
- date added to LUP
- 2013-05-30 11:31:08
- date last changed
- 2013-05-30 11:31:08
@misc{3802854, abstract = {{This bachelor thesis concerns the NIR spectral region of the Sr-filament, a substructure of the fan located in the equatorial skirt of Eta Carinae. The primary objective was to identify emission features intrinsic to the Sr-filament, and to tabulate these in a line-list spanning the spectral range λλ990 − 2410 nm. A secondary objective was concerned with the use of identified parity-forbidden atomic transitions for temperature diagnostics. The thesis is based on a long-slit NIR spectrum at resolution R approx. 10500, obtained using the ESO X-Shooter instrument at VLT. Centred on the Sr-filament, at a position offset 2.0 arcsec NW of the central object, the target is sampled during the recovery phase of Eta Carinae’s spectroscopic cycle. 300 emission features spectrally separated the Sr-filament from other sub-structures. Out of these, 144 lines were identified. One Zr II line and two Co II lines are identified, but not confirmed by previous studies. The resulting line-list indicates that the NIR spectrum of the S filament is dominated by CaI, TiII and FeI emission, accounting for 75% of the identified features. [TiII] lines are proposed as candidates for temperature diagnostics due to a span in excitation energy and wavelength. However, a lack of reference atomic transition probabilities prevented numerical calculations being conducted.}}, author = {{Rhodin, Henrik}}, language = {{eng}}, note = {{Student Paper}}, series = {{Lund Observatory Examensarbeten}}, title = {{Line Identification and Temperature Diagnostics of Eta Carina's Sr-Filament}}, year = {{2013}}, }