Atomic data from the IRON Project. 
XIX. Radiative transition probabilities for forbidden lines in
Fe II

Quinet, Pascal; Dourneuf, M. Le; Zeippen, C. J.

doi:10.1051/aas:1996298

Cited by 96 publications

(140 citation statements)

References 20 publications

Supporting

Mentioning

124

Contrasting

Order By: Relevance

“…The experimental A-values are given in Table 2, along with uncertainties and comparisons to calculations. The agreement with the values by Quinet et al (1996) is within our uncertainties. We estimate the uncertainty of the BFs to 6-12%, including the uncertainties in the intensity measurement, calibration, reddening and residual lines.…”

Section: Resultssupporting

confidence: 89%

“…The relativistic Hartree-Fock (HFR) calculations by Quinet et al (1996) show the best general agreement with the experimental values presented in this and previous studies. The agreement is good with the exception of the b 2 H 11/2 level (Rostohar et al 2001) which differs by 5σ.…”

Section: Discussionsupporting

confidence: 86%

“…In addition, the a 4 G 9/2 and b 2 H 11/2 levels have been measured by Hartman et al (2003) using the LPT. There is good agreement between Rostohar et al (2001) and the calculated values of Nussbaumer et al (1981) and Quinet et al (1996). However, the lifetimes of Rostohar et al (2001) are systematically shorter than the calculations of Garstang (1962).…”

Section: Introductionsupporting

confidence: 68%

See 2 more Smart Citations

The FERRUM project: transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes

Gurell

Hartman

Blackwell-Whitehead

et al. 2009

A&A

View full text Add to dashboard Cite

Context. Accurate transition probabilities for forbidden lines are important diagnostic parameters for low-density astrophysical plasmas. In this paper we present experimental atomic data for forbidden [Fe ii] transitions that are observed as strong features in astrophysical spectra.Aims. We measure lifetimes for the 3d 6 ( 3 G)4s a 4 G 11/2 and 3d 6 ( 3 D)4s b 4 D 1/2 metastable levels in Fe ii and experimental transition probabilities for the forbidden transitions 3d 7 a 4 F 7/2,9/2 -3d 6 ( 3 G)4s a 4 G 11/2 . Methods. The lifetimes were measured at the ion storage ring facility CRYRING using a laser probing technique. Astrophysical branching fractions were obtained from spectra of Eta Carinae, obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. The lifetimes and branching fractions were combined to yield absolute transition probabilities.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Discussionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 68%

See 1 more Smart Citation

The FERRUM project: transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes

Gurell

Hartman

Blackwell-Whitehead

et al. 2009

A&A

View full text Add to dashboard Cite

show abstract

“…A V varies from ∼6 in the knots Z1 and S to ∼12 in the knot Z2. Fernandes (2000) found a value of A V = 9.38 ± 1.49 mag in a region that covers our knots HH46-1 and S. This value has however been derived employing the theoretical [Fe ii] 1.644/1.257 μm ratio given by the radiative rates of Nussbaumer & Storey (1988) that predict higher values with respect to the Quinet et al (1996) rates (Nisini et al 2005). On the other hand, Antoniucci et al (2008) found an A V ∼ 40 mag on-source, indicating a high density gradient towards the central object.…”

Section: Extinctionmentioning

confidence: 81%

“…To convert the observed ratios into A v values, we have adopted the radiative transition probabilities given by Quinet et al (1996) using the relativistic Hartree-Fock (HFR) computer programme. The extinction errors have been estimated directly from the flux error of each line.…”

Section: Extinctionmentioning

confidence: 99%

IR diagnostics of embedded jets: kinematics and physical characteristics of the HH46-47 jet

Lopez

Nisini

Eislöffel

et al. 2010

A&A

View full text Add to dashboard Cite

Context. We present an analysis of the kinematics and physical properties of the Class I driven jet HH46-47 based on IR medium and low resolution spectroscopy obtained with ISAAC on VLT. Aims. Our aim is to study the gas physics as a function of the velocity and distance from the source and to compare the results with similar studies performed on other Class I and classical T Tauri jets as well as with existing models for the jet formation and excitation. have been used to derive physical parameters such as electron density, H 2 temperature, iron gas-phase abundance and mass flux. Methods[Fe ii] 1.644 μm and H 2 2.122 μm position velocity diagrams (PVDs) have been additionally constructed to study the kinematics of both the atomic and molecular gas. Results. Within 1000-2000 AU from the source the atomic gas presents a wide range of radial velocities, from ∼-230 km s −1 to ∼100 km s −1 . Only the gas component at the highest velocity (high velocity component, HVC) survives at large distances. The H 2 shows only a single velocity component at almost zero velocity close to the source while it reaches higer velocities (up to ∼95 km s −1 ) further downstream. Electron densities (n e ) and mass ejection fluxes (Ṁ jet ) have been separately measured for the HVC and for the component at lower velocity (LVC) from the [Fe ii] lines. n e increases with decreasing velocities with an average value of ∼ 6000 cm −3 for the LVC and ∼4000 cm −3 for the HVC, while the opposite occurs forṀ jet which is ∼0.5−2 × 10 −7 M yr −1 and ∼0.5−3.6 × 10 −8 M yr −1 for the HVC and LVC, respectively. The mass flux carried out by the molecular component, measured from the H 2 lines flux, is ∼4 × 10 −9 M yr −1 . We have estimated that the Fe gas phase abundance is significantly lower than the solar value, with ∼88% of iron still depleted onto dust grains in the internal jet region. This fraction decreases to ∼58%, in the external knots. Conclusions. Many of the derived properties of the HH46-47 jet are common to jets from young stellar objects (YSOs) in different evolutionary states. The derived densities and mass flux values are typical of Class I objects or very active T Tauri stars. However, the spatial extent of the LVC and the velocity dependence of the electron density have been so far observed only in another Class I jet, the HH34 jet, and are not explained by the current models of jet launching.

show abstract

The Opacity and Iron Projects — An Overview

Berrington

1997

Photon and Electron Collisions With Atoms and Molecules

View full text Add to dashboard Cite

Atomic data from the IRON Project. XIX. Radiative transition probabilities for forbidden lines in Fe II

Cited by 96 publications

References 20 publications

The FERRUM project: transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes

The FERRUM project: transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes

IR diagnostics of embedded jets: kinematics and physical characteristics of the HH46-47 jet

The Opacity and Iron Projects — An Overview

Contact Info

Product

Resources

About