Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/636/214     HII regions in dwarf irregular galaxies       (van Zee+, 2006)

Oxygen and nitrogen in isolated dwarf irregular galaxies. van Zee L., Haynes M.P. <Astrophys. J., 636, 214-239 (2006)> =2006ApJ...636..214V
ADC_Keywords: H II regions ; Abundances ; Galaxies, optical Keywords: galaxies: abundances - galaxies: dwarf - galaxies: evolution - galaxies: irregular - H II regions Abstract: We present long-slit optical spectroscopy of 67 HII regions in 21 dwarf irregular galaxies to investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low-mass galaxies. Oxygen abundances are obtained via direct detection of the temperature-sensitive emission lines for 25 HII regions; for the remainder of the sample, oxygen abundances are estimated from strong-line calibrations. The direct abundance determinations are compared to the strong-line abundance calibrations of both McGaugh (1991ApJ...380..140M) and Pilyugin (2000A&A...362..325P). Description: Optical spectroscopic observations of HII regions in 21 dwarf irregular galaxies were obtained with the Double Spectrograph on the 5m Palomar telescope during several observing runs between 1999 January and 2002 April. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 110 21 Global galaxy parameters table2.dat 55 31 Observing log table3.dat 163 66 HII region line strengths table4.dat 95 67 HII region line ratios table5.dat 101 67 HII region abundances table6.dat 68 19 Parameters of additional dwarf irregular galaxies
See also: J/AJ/116/2805 : H II regions in spiral galaxies (Van Zee+, 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy name 14- 15 I2 h RAh Hour of Right Ascension (J2000.0) 17- 18 I2 min RAm Minute of Right Ascension (J2000.0) 20- 23 F4.1 s RAs Second of Right Ascension (J2000.0) 25 A1 --- DE- Sign of the Declination (J2000.0) 26- 27 I2 deg DEd Degree of Declination (J2000.0) 29- 30 I2 arcmin DEm Arcminute of Declination (J2000.0) 32- 35 F4.1 arcsec DEs Arcsecond of Declination (J2000.0) 37- 43 A7 --- MType Morphological type 45- 49 F5.2 Mpc Dist Distance (1) 51- 53 I3 arcsec R25 Isophotal radius in arcsec 55- 57 F3.1 kpc R25kpc Isophotal radius in kpc 59- 64 F6.2 mag BMAG Absolute B magnitude (2) 66- 69 F4.2 mag (B-V)0 ? (B-V)0 color index (2) 71- 74 F4.2 mag e_(B-V)0 ? Error in (B-V)0 76- 78 F3.1 Sun MH/LB Mass/luminosity ratio (gas richness) 80- 83 F4.1 mag/arcsec2 mu0B ? Central surface brightness 85- 89 F5.2 [solMass] logMdyn Dynamical mass 91- 94 F4.2 --- 12+log(O/H) Oxygen abundance (3) 96- 99 F4.2 --- e_12+log(O/H) Error in 12+log(O/H) 101-105 F5.2 --- log(N/H) Nitrogen abundance (3) 107-110 F4.2 --- e_log(N/H) Error in log(N/H)
Note (1): Distances are calculated from systemic velocities using a Virgocentric infall model and an H0 of 75km/s/Mpc except for UGC 685 (Maiz-Apellaniz et al. 2002AJ....123.1307M), HKK97 L14 (Karachentsev et al. 2004, Cat. J/AJ/127/2031), UGC 4483 (Dolphin et al. 2001MNRAS.324..249D), and UGC 8651 and UGC 9240 (Karachentsev et al. 2002A&A...389..812K), which have tip of the Red Giant Branch distances in the literature. Note (2): Colors, magnitudes, optical size, and MH/LB are from van Zee (2000AJ....119.2757V). The absolute blue magnitudes and colors have been corrected for Galactic extinction Note (3): Global oxygen and nitrogen abundances are from the present study except for UGC 3672, for which more accurate abundances are available in the literature (van Zee et al. 1997AJ....114.2479V, 1997AJ....114.2497V).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy name 13 A1 --- --- [/] 14 A1 --- Slit Slit number 16- 17 I2 h RAh Hour of Right Ascension (J2000.0) 19- 20 I2 min RAm Minute of Right Ascension (J2000.0) 22- 25 F4.1 s RAs Second of Right Ascension (J2000.0) 27 A1 --- DE- Sign of the Declination (J2000.0) 28- 29 I2 deg DEd Degree of Declination (J2000.0) 31- 32 I2 arcmin DEm Arcminute of Declination (J2000.0) 34- 35 I2 arcsec DEs Arcsecond of Declination (J2000.0) 37- 39 I3 deg PA Position angle 41- 48 A8 --- Run Run identification 50 I1 --- Nexp Number of exposures 51 A1 --- --- [x] 52- 55 I4 s Tint Integration time
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy name (G1) 13 A1 --- --- [/] 14 A1 --- Slit Slit number 16- 19 I4 arcsec EW East-West offset from the galaxy center (East positive) (G1) 20- 23 I4 arcsec NS North-South offset from the galaxy center (North positive) (G1) 25- 29 F5.3 --- [OII] Relative [OII]3727+3729AA line strength (1) 31- 35 F5.3 --- e_[OII] Error in [OII] 37- 41 F5.3 --- [NeIII] ? Relative [NeIII]3869AA line strength (1) 43- 47 F5.3 --- e_[NeIII] ? Error in [NeIII] 49- 53 F5.3 --- [OIII] Relative [OIII]4959+5007 line strength (1) 55- 59 F5.3 --- e_[OIII] Error in [OIII] 61- 65 F5.3 --- [OI] ? Relative [OI]6300AA line strength (1) 67- 71 F5.3 --- e_[OI] ? Error in [OI] 73- 77 F5.3 --- [SIII] ? Relative [SIII]6312AA line strength (1) 79- 83 F5.3 --- e_[SIII] ? Error in [SIII] 85- 89 F5.3 --- Halpha Relative Halpha6563AA line strength (1) 91- 95 F5.3 --- e_Halpha Error in Halpha 97-101 F5.3 --- [NII] ? Relative [NII]6548+6584 line strength (1) 103-107 F5.3 --- e_[NII] ? Error in [NII] 109-113 F5.3 --- He ? Relative He6678AA line strength (1) 115-119 F5.3 --- e_He ? Error in He 121-125 F5.3 --- [SII] Relative [SII]6717+6731AA line strength (1) 127-131 F5.3 --- e_[SII] Error in [SII] 133-137 F5.3 --- [ArIII] ? Relative [ArIII]7136AA line strength (1) 139-143 F5.3 --- e_[ArIII] ? Error in [ArIII] 145-148 F4.2 --- cHbeta Reddening coefficient C 150-153 F4.2 --- e_cHbeta Error in cHbeta 155-157 I3 0.1nm EWHbeta Hβ equivalent width 159-163 F5.2 10-18W/m2 F(Hbeta) Hβ flux (in units of 10-15ergs/s/cm2)
Note (1): Reddening-corrected line intensities relative to Hβ.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy name (G1) 13 A1 --- --- [/] 14 A1 --- Slit [A-D] Slit number 16- 19 I4 arcsec EW East-West offset from the galaxy center (East positive) (G1) 20- 23 I4 arcsec NS North-South offset from the galaxy center (North positive) (G1) 25- 28 F4.2 --- [SII] The [SII] ratio (=I(6717)/I(6731) 30- 33 F4.2 --- e_[SII] Error in [SII] 35- 39 F5.1 --- [OIII] ? The [OIII] ratio (=I(4959+5007)/I(4363)) 41- 44 F4.1 --- e_[OIII] ? Error in [OIII] 46- 50 F5.3 --- log([OII]+[OIII]) log([OII]+[OIII]) 52- 56 F5.3 --- e_log([OII]+[OIII]) Error in log([OII]+[OIII]) 58- 63 F6.3 --- log([OIII]/[OII]) log([OIII]/[OII]) 65- 69 F5.3 --- e_log([OIII]/[OII]) Error in log([OIII]/[OII]) 71- 76 F6.3 --- log([NII]/[OII]) log([NII]/[OII]) 78- 82 F5.3 --- e_log([NII]/[OII]) Error in log([NII]/[OII]) 84- 89 F6.3 --- log([SII]/[OII]) ? log([SII]/[OII]) 91- 95 F5.3 --- e_log([SII]/[OII]) ? Error in log([SII]/[OII])
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Galaxy Galaxy name (G1) 14- 17 I4 arcsec EW East-West offset from the galaxy center (East positive) (G1) 18- 21 I4 arcsec NS North-South offset from the galaxy center (North positive) (G1) 23- 27 I5 K Te([OIII]) Electron temperature from [OIII] 29- 32 I4 K E_Te([OIII]) ? Upper limit error in Te([OIII]) 34- 37 I4 K e_Te([OIII]) ? Lower limit error in Te([OIII]) 39- 42 F4.2 --- 12+log(O/H)1 Oxygen abundance from McGaugh (1991ApJ...380..140M) 44- 47 F4.2 --- 12+log(O/H)2 Oxygen abundance from Pilyugin (2000A&A...362..325P) 49- 52 F4.2 --- 12+log(O/H) Oxygen abundance 54- 57 F4.2 --- e_12+log(O/H) Error in 12+log(O/H) 59- 63 F5.2 --- log(N/O) ? log(N/O) abundance ratio 65- 68 F4.2 --- e_log(N/O) ? Error in log(N/O) 70- 74 F5.2 --- log(Ne/O) ? log(Ne/O) abundance ratio 76- 79 F4.2 --- e_log(Ne/O) ? Error in log(Ne/O) 81- 85 F5.2 --- log(S/O) ? log(S/O) abundance ratio 87- 90 F4.2 --- e_log(S/O) ? Error in log(S/O) 92- 96 F5.2 --- log(Ar/O) ? log(Ar/O) abundance ratio 98-101 F4.2 --- e_log(Ar/O) ? Error in log(Ar/O)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Galaxy Galaxy name 11- 15 F5.2 Mpc Dist Distance (1) 17- 22 F6.2 mag BMAG Absolute B magnitude (2) 24- 27 F4.2 mag (B-V)0 ? (B-V)_0_ color index (2) 29- 32 F4.2 mag e_(B-V)0 ? Error in (B-V)0 (2) 34- 36 F3.1 Sun MH/LB Mass/luminosity ratio (gas richness) (2) 38- 41 F4.1 --- mu0B ? Central surface brightness 43- 47 F5.2 [solMass] logMdyn ? Dynamical mass 49- 52 F4.2 --- 12+log(O/H) Oxygen abundance (2) 54- 57 F4.2 --- e_12+log(O/H) Error in 12+log(O/H) 59- 63 F5.2 --- log(N/H) Nitrogen abundance (2) 65- 68 F4.2 --- e_log(N/H) Error in log(N/H)
Note (1): Distances are calculated from systemic velocities using a Virgocentric infall model and an H0 of 75km/s/Mpc, except for -- Leo A (Dohm-Palmer et al. 1998AJ....116.1227D), -- GR 8 (Dohm-Palmer et al. 1998AJ....116.1227D), and -- UGC 9128 (Aparicio et al. 2000AJ....119..177A), which have TRGB distances in the literature. Note (2): Colors, magnitudes, MH/LB, and oxygen and nitrogen abundances are from van Zee et al. (1997AJ....114.2479V, 1997AJ....114.2497V, 2005 in press).
Global Notes: Note (G1): [VH2006] UGC NNNNN A +XXX+YYY or [VH2006] Z 7-25 A +XXX+YYY in Simbad, where +XXX and +YYY are the East-West and North-South offsets (respectively) from the galaxy center and A is the slit name.
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 30-Oct-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact