absorption lines
Iron abundances from optical FeIII absorption lines in B-type stellar spectra
... metal absorption lines (due to their low projected rotational velocities), so that, even with relatively poor quality optical spectra, Fe III features can be ...
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Röttgers, Bernhard (2017): Simulated absorption lines in the circum-galactic medium. Dissertation, LMU München: Fakultät für Physik
... That alone, however, is not sufficient to explain the breakdown of the correlation of column densities and EWs. The velocity dispersion along a l.o.s. also vary between typically ∼ 10 km/s and ∼ 100 km/s, also largely ...
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Investigating the nature of absorption lines in the Chandra X ray spectra of the neutron star binary 4U 1820−30
... X-ray absorption lines in X-ray binaries, including the Ne II , Ne III , Ne IX , O VII , and O VIII ...the lines are generally consistent between the observations, as expected if these lines ...
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A study of interstellar Na I D absorption lines towards the Lupus molecular clouds
... interstellar lines in the spectra of stars at a range of known ...matter, absorption lines provide additional information on the velocity structure, and thus the number of discrete absorbing regions, ...
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Reionization and high redshift galaxies: the view from quasar absorption lines
... quasar absorption lines play a unique role by probing the properties of diffuse gas on galactic and intergalactic ...which absorption lines trace the connection between galaxies and the IGM ...
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ISO - SWS observations of pure rotational H2O absorption lines toward Orion - IRc2
... vapor absorption lines have been made toward Orion IRc2 using the Short Wave- length Spectrometer (SWS) on board the Infrared Space Obser- vatory ...rotational lines, originating from energy levels ...
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Diminished greenhouse warming from Archean methane due to solar absorption lines
... Dashed lines are for the low-H 2 O parametrization, solid lines are for the mid-H 2 O parametrization, and dotted lines are for the high-H 2 O ...Black lines are for the HITRAN 2012 database ...
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Exploring new emission line diagnostics for accreting compact objects
... photospheric absorption lines from the ...emission lines to try and constrain system parameters ...Balmer lines for the study of velocity gradients and ...
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An Analysis of the Variable Star, W Virginis
... At about minimum light phase 0.65, when the absorption lines are strong, there appear hydrogen emission lines of the Balmer series with an outward surface velocity of 20 km./ sec... 'l'h[r] ...
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Space telescope and optical reverberation mapping project VIII Time variability of emission and absorption in NGC 5548 based on modeling the ultraviolet spectrum
... intrinsic absorption affects the blue wings of the most prominent emission lines: Ly α λ 1216, C IV λλ 1548, 1550, N V λ 1238, 1242, and Si IV λ 1393, ...This absorption consists of a broad component ...
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Stellar populations and ages of M82 super star clusters
... G-type absorption features. Strong Ca ii and Na i interstellar absorption lines arising in M82 are also detected, and the l6283 diffuse interstellar band appears to be ...
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Solid state spectroscopy : laser selective excitation of erbium ions in crystalline solids
... Although the absorption lines of the F- sites in 68 h hydrogenated crystals have become too weak to be observed, laser selective excitation still yields F- site emission lines at about 1[r] ...
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Untangling galaxy components: full spectral bulge–disc decomposition
... The key to addressing this question is provided by spectra: Since their absorption lines contain information on both stellar kinematics and populations, analysis of spectral data can, in[r] ...
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ASASSN-15lh: a superluminous ultraviolet rebrightening observed by Swift and Hubble
... broad absorption or emission lines seen in SLSNe or tidal disruption events and the early optical spectra of ...Lyα absorption near the redshift previously found by optical absorption ...
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Analytical method to find the optimal parameters for gas detectors based on correlation spectroscopy using a Fabry Perot interferometer
... ro-vibrational absorption lines with pressure-broadened Lorentzian line ...These lines are characteristic of most diatomic and linear molecules, ...
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Water vapor on supergiants The 12 micron TEXES spectra of ? Cephei
... µm lines were expected to be in emission, but the opposite is ...weak absorption lines for the effective temperature expected for the ...µm lines is able to fit the spectra, possibly providing ...
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An experimental determination of the absolute oscillator strengths of some resonance transitions of chromium and nickel
... resonance frequency, or continuous is passed through a confined sample of vapor which is kept at thermal equilibrium in an absorption cell, the resulting absorption lines may be studied [r] ...
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Spatially resolved optical spectroscopy of the Herbig Ae/Vega like binary star HD 35187
... for absorption lines arising in the circumstellar disc presumed to be responsible for the infrared excess of HD 35187 (Sec- tion ...time-variable absorption lines are observed in the edge-on ...
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A study of lambda Bootis type stars in the wavelength region beyond 7000 Å
... interstellar lines (often denoted as “shell” signs) seriously ques- tions the spectral classification criteria of the λ Bootis group as established by Gray ...broad absorption lines and 2) sharp ...
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Completely automated open-path FT-IR spectrometry
... atmospheric absorption lines, the USEPA recommends either the use of short spectral regions in which no lines caused by atmospheric water vapor absorb or that a single-beam background spectrum is ...
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