J/ApJS/181/473 Analysis of the spectrum of η Car (Nielsen+, 2009)
Eta Carinae across the 2003.5 minimum: analysis in the visible and near-infrared
spectral region.
Nielsen K.E., Kober G.V., Weis K., Gull T.R., Stahl O., Bomans D.J.
<Astrophys. J. Suppl. Ser., 181, 473-485 (2009)>
=2009ApJS..181..473N 2009ApJS..181..473N
ADC_Keywords: Atomic physics ; Spectroscopy
Keywords: circumstellar matter - line: identification -
stars: individual (eta Car)
Abstract:
We present an analysis of the visible through near-infrared spectrum
of Eta Carinae (η Car) and its ejecta obtained during the "η Car
Campaign with the Ultraviolet and Visual Echelle Spectrograph (UVES)
at the ESO Very Large Telescope (VLT)." This is a part of larger
effort to present a complete η Car spectrum, and extends the
previously presented analyses with the Hubble Space Telescope/Space
Telescope Imaging Spectrograph (HST/STIS) in the UV (1240-3159Å) to
10430Å. The spectrum in the mid- and near-UV is characterized by
the ejecta absorption. At longer wavelengths, stellar wind features
from the central source and narrow-emission lines from the Weigelt
condensations dominate the spectrum. However, narrow absorption lines
from the circumstellar shells are present. This paper provides a
description of the spectrum between 3060 and 10430Å, including line
identifications of the ejecta absorption spectrum, the emission
spectrum from the Weigelt condensations and the P Cygni stellar wind
features. The high spectral resolving power of VLT/UVES enables
equivalent width measurements of atomic and molecular absorption lines
for elements with no transitions at the shorter wavelengths. However,
the ground-based seeing and contributions of nebular-scattered
radiation prevent direct comparison of measured equivalent widths in
the VLT/UVES and HST/STIS spectra. Fortunately, HST/STIS and VLT/UVES
have a small overlap in wavelength coverage which allows us to compare
and adjust for the difference in scattered radiation entering the
instruments' apertures. This paper provides a complete online VLT/UVES
spectrum with line identifications and a spectral comparison between
HST/STIS and VLT/UVES between 3060 and 3160Å.
Description:
Coordinated, highly complementary, observations were made with the
HST/STIS and the VLT/UVES before, during, and after the spectroscopic
low state centered on 2003.5 and with annual visits during the
recovery period through 2006.4. The STIS echelle observation, used in
this analysis, was obtained in 2004 March.
Objects:
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RA (2000) DE Designation(s)
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10 45 03.6 -59 41 04 eta Car = HR 4210
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 85 1567 Identificationi of lines in the spectral interval
3060-10430Å
refs.dat 112 49 References
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See also:
J/other/NewA/15.108 : UBVRIHalpha of eta Car in 2009 (Fernandez-Lajus+ 2010)
J/A+A/493/1093 : BVRI light curves of eta Car (Fernandez-Lajus+, 2009)
J/ApJS/168/289 : NUV spectrum of eta Car in 2003.5 (Nielsen+, 2007)
J/ApJS/163/173 : UV spectrum of eta Car in 2003.5 (Gull+, 2006)
J/ApJS/157/138 : UV spectrum of eta Car (Nielsen+, 2005)
J/AJ/129/2018 : RXTE scaled fluxes of eta Car (Corcoran+, 2005)
J/A+A/419/215 : Emission lines of eta Car (Hartman+, 2004)
J/A+A/343/847 : Geneva Photometry of Eta Car (van Genderen+ 1999)
J/A+A/304/415 : uvby-Hbeta photometry of Eta Car 1992-94 (van Genderen+, 1995)
J/ApJS/71/983 : UV spectrum of eta Car (Viotti+ 1989)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 0.1nm Owave Observed wavelength
10- 18 A9 --- Ion Element
20- 45 A26 --- Conf Configuration
47- 54 F8.2 0.1nm Lwave Laboratory wavelength
56 A1 --- n_Lwave [abcde] Note on the wavelength (1)
58- 61 A4 --- f_Lwave Non-stellar line (2)
63- 66 A4 km/s HV Heliocentric velocity of line
68- 73 I6 cm-1 Elow Energy of transition's lower energy state
75- 80 A6 --- log(gf) Log of Oscillator Strength*Statistical weight
82- 85 A4 --- r_log(gf) Reference on log(gf) in refs.dat file (3)
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Note (1): Flags as follows:
a = Wavelength from Arvidsson K. 2003, Master Thesis, Lund University.
b = Wavelength from Johansson S. private communication.
c = The OH line is the sum of OH3079.36 and 3079.23.
d = Transition cascade from HI Lyman pumped energy level.
e = Direct transition from HI Lyman pumped energy level.
Note (2): Flags as follows:
is = Interstellar line;
em = Emission line;
wind = Stellar Wind Feature;
cs = Circumstellar Absorption Line.
Note (3): Nonreferenced data are from R. Kurucz's Atomic Line Database
(http://cfa-www.harvard.edu/amp/ampdata/kurucz23/sekur.html).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Ref Reference designation
6- 24 A19 --- BibCode Bibcode
26- 49 A24 --- Aut Author's name(s)
51-112 A62 --- Com Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Nov-2009