J/ApJ/644/1006 HH 529 spectroscopy (Blagrave+, 2006) ================================================================================ A photoionized Herbig-Haro object in the Orion nebula. Blagrave K.P.M., Martin P.G., Baldwin J.A. =2006ApJ...644.1006B ================================================================================ ADC_Keywords: H II regions ; Stars, pre-main sequence ; Spectroscopy Keywords: dust, extinction - H II regions - ISM: Herbig-Haro objects Abstract: The spectra of Herbig-Haro objects are usually characteristic of ionization and excitation in shock-heated gas, whether an internal shock in an unsteady outflow or a bow shock interface with the interstellar medium. We examine the easternmost shock the leading optically visible shock of a Herbig-Haro outflow (HH 529) seen projected on the face of the Orion Nebula, using deep optical echelle spectroscopy, showing that the spectrum of this gas is consistent with photoionization by theta^1^ Ori C. By modeling the emission lines, we determine a gas-phase abundance of Fe that is consistent with the depleted (relative to solar) abundance found in the Orion nebula-evidence for the presence of dust in the nebula and therefore in the Herbig-Haro outflow. The spectrum also allows for the calculation of temperature fluctuations, t^2^, in the nebula and the shock. These fluctuations have been used to explain discrepancies between abundances obtained from recombination lines versus those obtained from collisionally excited lines, although to date there has not been a robust theory for how such large fluctuations (t^2^>0.02) can be. Description: Spectra were obtained using the echelle spectrograph on the 4m Blanco telescope at the Cerro Tololo Inter-American Observatorycovering the spectral range from the near-UV (3500{AA}) to the near-IR (7500{AA}). Three sets of red and blue spectra were obtained on two dates in 1997 and 1998. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 05 35.3 -05 23 HH 529 = HH 529 ----------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 111 443 Summary of double Gaussian fits to observed echelle spectra -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 F8.3 0.1nm ID ? Wavelength identification (1) 10 A1 --- f_ID [ns] nebular or shock component 12- 19 A8 --- Ion Ion identification 21 A1 --- f_S/N [?] A low S/N (2.6