Volume 421, Number 2, July II 2004
|Page(s)||539 - 554|
|Published online||22 June 2004|
Main Astronomical Observatory, Ukrainian National Academy of Sciences, 27 Zabolotnoho str., Kyiv 03680, Ukraine
2 Universitäts – Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany
3 Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA
Corresponding author: Y. I. Izotov, email@example.com
Accepted: 29 March 2004
We present VLT spectroscopic observations with different spectral resolutions and different slit orientations of the two metal-deficient blue compact dwarf (BCD) galaxies Tol 1214–277 and Tol 65. The oxygen abundances in the brightest H ii regions of Tol 1214–277 and Tol 65 are found to be and , or /24. The nitrogen-to-oxygen abundance ratios in the two galaxies are log N/O = – and – and lie in the narrow range found for other most metal-deficient BCDs. The helium mass fraction derived in several H ii regions in both galaxies is consistent with a high primordial helium mass fraction, . We confirm the detection of the high-ionization forbidden emission line [Fe v] λ4227 in the spectrum of Tol 1214–277. Additionally, weak [Ne iv] λ4725, [Fe vi] λ5146, λ5177, and [Fe vii] λ5721, λ6087 emission lines are detected in the high-resolution spectrum of Tol 1214–277. The detection of these lines implies the presence of hard radiation with photon energy in the range ~4–8 Ryd. Emission lines are detected in the spectra of eight galaxies in the fields of Tol 1214–277 and Tol 65. Seven of these galaxies are background objects, while one galaxy has a redshift close to that of Tol 1214–277. Situated at a projected distance of ~14.5 kpc from Tol 1214–277, this galaxy is probably a companion of the BCD.
Key words: galaxies: starburst / galaxies: abundances / galaxies: individual: Tol 1214–277 / galaxies: individual: Tol 65
Based on observations obtained at the European Southern Observatory, Paranal, Chile (ESO Programs 63.P-0003 and 65.N-0642).
Tables 2–4 and 8 are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/421/539
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.