DENSITIES, TEMPERATURES, PRESSURES, AND ABUNDANCES DERIVED FROM O II RECOMBINATION LINES IN H II REGIONS AND THEIR IMPLICATIONS
@article{Peimbert2013DENSITIESTP, title={DENSITIES, TEMPERATURES, PRESSURES, AND ABUNDANCES DERIVED FROM O II RECOMBINATION LINES IN H II REGIONS AND THEIR IMPLICATIONS}, author={Antonio Peimbert and M. Peimbert}, journal={The Astrophysical Journal}, year={2013}, volume={778}, pages={89} }
Based on high-quality observations of multiplet V1 of O II and the NLTE atomic computations of O II, we study the density and temperature of a sample of H II regions. We find that the signature for oxygen-rich clumps of high density and low temperature is absent in all objects of our sample: one extragalactic and eight Galactic H II regions. The temperatures derived from (1) recombination lines (RLs) of O II, and (2) RLs of H I together with Balmer continua are lower than those derived from…
Figures and Tables from this paper
17 Citations
The Temperature and Density from Permitted O ii Lines in the Planetary Nebula NGC 7009
- PhysicsThe Astrophysical Journal
- 2019
We present spatialand velocity-resolved spectroscopy of NGC 7009 acquired with the UVES spectrograph at the VLT UT2/Kueyen. We use these data to determine the structure of the electron temperature…
Physical conditions and chemical abundances in PN M 2-36. Results from deep echelle observations
- PhysicsMonthly Notices of the Royal Astronomical Society
- 2021
We present a spectrum of the planetary nebula (PN) M 2-36 obtained using the Ultraviolet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope. 446 emission lines are detected. We…
Electron Temperatures in Orion A
- Physics
- 2015
We measured the hydrogen, helium, and carbon 106α radio recombination lines (RRLs), three different β and γ lines, and radio continuum at 4' east, west, and south of the peak of the H ii region NGC…
Photoionized Herbig–Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy – I. HH 529 II and III
- Physics
- 2021
We present the analysis of physical conditions, chemical composition and kinematic properties of two bow shocks—HH 529 II and HH 529 III— of the fully photoionized Herbig-Haro object HH 529 in the…
Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity
- Physics
- 2016
We present spectra of 14 A-type supergiants in the metal-rich spiral galaxy M83. We derive stellar parameters and metallicities and measure a spectroscopic distance modulus mu = 28.47 +/- 0.10 (4.9…
Studies of NGC?6720 with Calibrated HST/WFC3 Emission-line Filter Images. II. Physical Conditions
- Physics
- 2013
We have performed a detailed analysis of the electron temperature and density in the Ring Nebula using the calibrated Hubble Space Telescope WFC3 images described in the preceding paper. The electron…
Can the Kappa-distributed Electron Energies Account for the Intensity Ratios of O ii Lines in Photoionized Gaseous Nebulae?
- Physics
- 2020
A vexing puzzle in the study of planetary nebulae and \ion{H}{2} regions is that the plasma diagnostic results based on collisionally excited lines systematically differ from those based on…
Recombination coefficients for O ii lines in nebular conditions
- Physics
- 2017
We present the results of a calculation of recombination coefficients for O^{2+} + e^- using an intermediate coupling treatment that fully accounts for the dependence of the distribution of…
TESTING THE EXISTENCE OF NON-MAXWELLIAN ELECTRON DISTRIBUTIONS IN H II REGIONS AFTER ASSESSING ATOMIC DATA ACCURACY
- Physics
- 2014
The classic optical nebular diagnostics [N II], [O II], [O III], [S II], [S III], and [Ar III] are employed to search for evidence of non-Maxwellian electron distributions, namely κ distributions, in…
The Cocoon Nebula and its ionizing star: do stellar and nebular abundances agree?
- Physics
- 2014
(Abridged) Main sequence massive stars embedded in an HII region should have the same chemical abundances as the surrounding nebular gas+dust. The Cocoon nebula, a close-by Galactic HII region…
References
SHOWING 1-10 OF 40 REFERENCES
Plasma diagnostics for planetary nebulae and H ii regions using N ii and O ii optical recombination lines
- PhysicsProceedings of the International Astronomical Union
- 2011
Abstract We carry out plasma diagnostic analysis for a number of planetary nebulae (PNe) and H ii regions. We use N ii and O ii optical recombination lines (ORLs) with new effective recombination…
The O++/H+ abundance ratio in gaseous nebulae derived from recombination lines.
- Physics
- 1993
We present O +2 /H + values for the Orion Nebula, M17, and NGC 6572 based on O II recombination lines, which are independent of the temperature structure of the observed nebulae. In the H II regions…
RECALIBRATION OF PAGEL'S METHOD FOR H II REGIONS CONSIDERING THE THERMAL STRUCTURE, THE IONIZATION STRUCTURE, AND THE DEPLETION OF O INTO DUST GRAINS
- Physics
- 2012
Using a sample of 28 H II regions from the literature with measured temperature inhomogeneity parameter, t 2, we present a statistical correction to the chemical abundances determined with the Te…
Enrichment of the interstellar medium by metal-rich droplets and the abundance bias in H II regions
- Physics
- 2007
We critically examine a scenario for the enrichment of the interstellar medium (ISM) in which supernova ejecta follow a long (10 8 yr) journey before falling back onto the galactic disk in the form…
Fine-Scale Temperature Fluctuations in the Orion Nebula and the t2 Problem*
- Physics
- 2003
We present a high spatial resolution map of the columnar electron temperature (Tc) of a region to the southwest of the Trapezium in the Orion Nebula. This map was derived from Hubble Space Telescope…
Oxygen Abundance Determination in H II Regions: The Strong Line Intensities-Abundance Calibration Revisited
- Physics
- 2005
The problem of oxygen abundance determination in H II regions based on the strong oxygen line intensities-oxygen abundance empirical calibration is revisited. A compilation of spectroscopic data of H…
A reappraisal of the chemical composition of the Orion nebula based on Very Large Telescope echelle spectrophotometry
- Physics
- 2004
We present Very Large Telescope (VLT) UVES echelle spectrophotometry of the Orion nebula in the 3100-10 400 A range. We have measured the intensity of 555 emission lines, many of them corresponding…
The chemical composition of the Orion star forming region. II. Stars, gas, and dust: the abundance discrepancy conundrum
- Physics
- 2011
Aims. We re-examine the recombination/collisional emission line (RL/CEL) nebular abundance discrepancy problem in the light of recent high-quality abundance determinations in young stars in the Orion…
bHROS high spectral resolution observations of PN forbidden and recombination line profiles
- PhysicsProceedings of the International Astronomical Union
- 2006
We have acquired high spectral resolution observations (R=150,000) of the planetary nebulae NGC 7009 and NGC 6153, using bHROS on Gemini South. Observations of this type may provide a key to…
Chemical composition of the Orion nebula derived from echelle spectrophotometry
- Physics
- 1998
We present echelle spectroscopy in the 3500- to 7060-?
range for two positions of the Orion nebula. The data were obtained using the 2.1-m telescope at Observatorio Astron??mico Nacional in San…