VLT spectroscopy of Tol 1214-277 & Tol 65 (Izotov+, 2004)

Details VLT spectroscopy of Tol 1214-277 & Tol 65 (Izotov+, 2004) VLT spectroscopy of Tol 1214-277 & Tol 65 (Izotov+, 2004)

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ycat..34210539i&link_type=abstract

VizieR On-line Data Catalog: J/A+A/421/539. Originally published in: 2004A&A...421..539I

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Galaxies: Spectra, H Ii Regions, Equivalent Widths

Scientific paper

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+logO/H=7.55+/-0.01 and 7.54+/-0.01, or Z{sun}/24. The nitrogen-to-oxygen abundance ratios in the two galaxies are logN/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 ~4-8Ryd. 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 ~14.5kpc from Tol 1214-277, this galaxy is probably a companion of the BCD.
(6 data files).

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