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Deep VLT spectroscopy of the blue compact dwarf galaxies Tol 1214-277 and Tol 65 | Y. I. Izotov
; P. Papaderos
; N. G. Guseva
; K. J. Fricke
; T. X. Thuan
; | Date: |
21 Aug 2004 | Journal: | Astron.Astrophys. 421 (2004) 539-554 | Subject: | astro-ph | Affiliation: | Main Astronomical Observatory, Kyiv, Ukraine, Universitats-Sternwarte, Goettingen, Germany, University of Virginia, Charlottesville, USA | Abstract: | 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 HII regions of Tol 1214-277 and Tol 65 are found to be 12+log O/H = 7.55+/-0.01 and 7.54+/-0.01, or Zsun/24. The nitrogen-to-oxygen abundance ratios in the two galaxies are log N/O =-1.64+/-0.03 and -1.60+/-0.02 and lie in the narrow range found for other most metal-deficient BCDs. The helium mass fraction derived in several HII regions in both galaxies is consistent with a high primordial helium mass fraction, Yp ~ 0.244. We confirm the detection of the high-ionization forbidden emission line [FeV]4227 in the spectrum of Tol 1214-277. Additionally, weak [NeIV]4725, [FeVI]5146, 5177, and [FeVII]5721, 6087 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. | Source: | arXiv, astro-ph/0408392 | Services: | Forum | Review | PDF | Favorites |
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