J/A+A/421/539 VLT spectroscopy of Tol 1214-277 & Tol 65 (Izotov+, 2004) ================================================================================ Deep VLT spectroscopy of the blue compact dwarf galaxies Tol 1214-277 and Tol 65 Izotov Y.I., Papaderos P., Guseva N.G., Fricke K.J., Thuan T.X. =2004A&A...421..539I ================================================================================ ADC_Keywords: Galaxies, spectra ; H II regions ; Equivalent widths Keywords: galaxies: starburst - galaxies: abundances - galaxies: individual: Tol 1214-277, Tol 65 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+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. Objects: ---------------------------------------------------------------------- RA (2000) DE Designation(s) (Note) ---------------------------------------------------------------------- 12 17 17.1 -28 02 33 Tol 1214-277 (brightest region 1) 12 25 46.9 -36 14 01 Tol 65 = Tol 1223-359 (brightest region 1) ---------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 91 53 Corrected fluxes and equivalent widths of the emission lines in the high-resolution spectra of the brightest HII regions in Tol 1214-277 and Tol 65 table3.dat 92 37 Corrected fluxes and equivalent widths of the emission lines in the low-resolution spectra of the brightest HII regions in Tol 1214-277 table4.dat 92 38 Corrected fluxes and equivalent widths of the emission lines in the low-resolution spectra of the brightest HII regions in Tol 65 addit.dat 55 33 Additional data for tables 2 to 4 table7.dat 26 8 Coordinates of the emission-line galaxies in the fields of Tol 1214-277 and Tol 65 table8.dat 56 26 Parameters of the emission lines in the spectra of galaxies in the fields of Tol 1214-277 and Tol 65 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 0.1nm lambda Non-redshifted wavelength 6- 15 A10 --- Ion Emission-line identification 17- 22 F6.4 --- Flux1 Emission-line flux relative to Hbeta in region 1 of Tol 1214-277 (G1) 24- 29 F6.4 --- e_Flux1 1sigma flux error 31- 36 F6.1 0.1nm EW1 Equivalent width of the emission line in region 1 of Tol 1214-277 38- 40 F3.1 0.1nm e_EW1 Equivalent width 1sigma error 42- 47 F6.4 --- FHbeta1+2 Emission-line flux relative to Hbeta in regions 1+2 of Tol 65 (G1) 49- 54 F6.4 --- e_FHbeta1+2 1sigma flux error 56- 61 F6.1 0.1nm EW1+2 Equivalent width of the emission line in regions 1+2 of Tol 65 63- 65 F3.1 0.1nm e_EW1+2 Equivalent width 1sigma error 67- 72 F6.4 --- Flux3+4 Emission-line flux relative to Hbeta in regions 3+4 of Tol 65 (G1) 74- 79 F6.4 --- e_Flux3+4 1sigma flux error 81- 86 F6.1 0.1nm EW3+4 Equivalent width of the emission line in regions 3+4 of Tol 65 88- 90 F3.1 0.1nm e_EW3+4 Equivalent width 1sigma error -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 0.1nm lambda Non-redshifted wavelength 6- 15 A10 --- Ion Emission-line identification 17- 21 F5.3 --- Flux1a Emission-line flux relative to Hbeta in region 1 of Tol 1214-277 observed in 1999 (G1) 23- 27 F5.3 --- e_Flux1a 1sigma flux error 29- 34 F6.1 0.1nm EW1a Equivalent width of the emission line in region 1 of Tol 1214-277 observed in 1999 36- 40 F5.3 --- Flux1b Emission-line flux relative to Hbeta in region 1 of Tol 1214-277 observed in 2000 (G1) 42- 46 F5.3 --- e_Flux1b 1sigma flux error 48- 53 F6.1 0.1nm EW1b Equivalent width of the emission line in region 1 of Tol 1214-277 observed in 2000 55- 59 F5.3 --- Flux2a Emission-line flux relative to Hbeta in region 2 of Tol 1214-277 observed in 1999 (G1) 61- 65 F5.3 --- e_Flux2a 1sigma flux error 67- 72 F6.1 0.1nm EW2a Equivalent width of the emission line in region 2 of Tol 1214-277 observed in 1999 74- 78 F5.3 --- Flux2b Emission-line flux relative to Hbeta in region 2 of Tol 1214-277 observed in 2000 (G1) 80- 84 F5.3 --- e_Flux2b 1sigma flux error 86- 91 F6.1 0.1nm EW2b Equivalent width of the emission line in region 2 of Tol 1214-277 observed in 2000 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 0.1nm lambda Non-redshifted wavelength 6- 15 A10 --- Ion Emission-line identification 17- 21 F5.3 --- Flux1 Emission-line flux relative to Hbeta in region 1 of Tol 65 (G1) 23- 27 F5.3 --- e_Flux1 1sigma flux error 29- 34 F6.1 0.1nm EW1 Equivalent width of the emission line in region 1 of Tol 65 36- 40 F5.3 --- Flux2 Emission-line flux relative to Hbeta in region 2 of Tol 65 (G1) 42- 46 F5.3 --- e_Flux2 1sigma flux error 48- 53 F6.1 0.1nm EW2 Equivalent width of the emission line in region 2 of Tol 65 55- 59 F5.3 --- Flux3 Emission-line flux relative to Hbeta in region 3 of Tol 65 (G1) 61- 65 F5.3 --- e_Flux3 1sigma flux error 67- 72 F6.1 0.1nm EW3 Equivalent width of the emission line in region 3 of Tol 65 74- 78 F5.3 --- Flux4 Emission-line flux relative to Hbeta in region 4 of Tol 65 (G1) 80- 84 F5.3 --- e_Flux4 1sigma flux error 86- 91 F6.1 0.1nm EW4 Equivalent width of the emission line in region 4 of Tol 65 (G1) -------------------------------------------------------------------------------- Byte-by-byte Description of file: addit.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- Table [2/4] Table number 3- 14 A12 --- Gal Galaxy name 16- 17 A2 --- Res Type of spectral resolution (HR or LR) 19- 26 A8 --- Param Parameter (1) 29- 31 A3 --- Region Region number in the galaxy 32 A1 --- Year [ab] Year of observation a=1999, b=2000 34- 38 F5.3 --- Value Value of the parameter 40- 44 F5.3 --- e_Value rms uncertainty on Value 46- 55 A10 --- x_Value Unit of the Value parameter -------------------------------------------------------------------------------- Note (1): The parameters are: F(Hbeta): Observed Hbeta flux, in 10-7W/s/m2 C(Hbeta): Extinction coefficient, in dex EW(abs): Equivalent width of hydrogen absorption lines, in 0.1nm -------------------------------------------------------------------------------- Byte-by-byte Description of file: table7.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- Gal Galaxy name (g1 to g8) 5- 6 I2 h RAh Right ascension (J2000.0) 8- 9 I2 min RAm Right ascension (J2000.0) 11- 14 F4.1 s RAs Right ascension (J2000.0) 17 A1 --- DE- Declination sign (J2000.0) 18- 19 I2 deg DEd Declination (J2000.0) 21- 22 I2 arcmin DEm Declination (J2000.0) 24- 25 I2 arcsec DEs Declination (J2000.0) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table8.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- Gal Galaxy name (g1 to g8) (1) 4- 7 I4 0.1nm lambda Non-redshifted wavelength 9- 18 A10 --- Ion Emission-line identification 20- 25 F6.1 0.1nm Lobs Observed wavelength 27- 29 F3.1 0.1nm e_Lobs 1sigma error of the observed wavelength 31- 35 F5.1 10-20W/m2/s Flux Observed flux 37- 39 F3.1 10-20W/m2/s e_Flux 1sigma error of the observed flux 41- 43 I3 0.1nm EW Equivalent width of the emission line 45- 46 I2 0.1nm e_EW 1sigma error of the equivalent width 48- 53 F6.4 --- z Redshift -------------------------------------------------------------------------------- Note (1): Galaxy designations: g1-g4: galaxies in Tol 1214-277, [FIP2001] GN, N=1-3, in Simbad g5-g8: galaxies in Tol 65 -------------------------------------------------------------------------------- Global notes: Note (G1): Fluxes are corrected for underlying stellar absorption (for hydrogen lines) and interstellar extinction. -------------------------------------------------------------------------------- Acknowledgements: Yuri Izotov ================================================================================ (End) Patricia Bauer [CDS] 13-Apr-2004