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J/A+A/422/511       Oxygen abundance in M101 HII regions     (Cedres+, 2004)

The oxygen abundance gradient in M101: the reliability of the P method. Cedres B., Urbaneja M.A., Cepa J. <Astron. Astrophys. 422, 511 (2004)> =2004A&A...422..511C
ADC_Keywords: H II regions; Photometry, narrow-band; Abundances; Keywords: ISM: HII regions - galaxies: individual: M101 - galaxies: abundances Abstract: We present the oxygen abundance determination for 90 HII regions in the inner parts of the grand design galaxy M101. The abundances were derived employing the P method (Pilyugin, 2001A&A...369..594P). A comparison is made with previous determinations using another calibration and direct measurements of electron temperature to derive the oxygen abundance. The results show agreement with the abundances derived from the electron temperature method and also show that the older calibration is not as accurate as the P method. Objects: ------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------ 14 03 12.5 +54 20 53 M 101 = NGC 5457 ------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 20 221 Region number and derived oxygen abundance for M101 (NGC 5457)
See also: J/A+A/391/809 : HII regions in NGC 5457 and NGC 4395 (Cedres+, 2002) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
4- 6 I3 --- Region Region identification number (1) 10- 13 F4.2 --- 12+log(O/H) Oxygen abundance (H=12) 17- 20 F4.2 --- e_12+log(O/H) Error in the oxygen abundance
Note (1): The region number is the employed in Cedres & Cepa (2002, Cat. J/A+A/391/809), [CC2002] NGC 5457 NNN in Simbad
Acknowledgements: Bernabe Cedres Exposito
(End) Patricia Vannier [CDS] 12-Jul-2004
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

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