The metal content of GR 8 and Sextans B

Details The metal content of GR 8 and Sextans B The metal content of GR 8 and Sextans B

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..310m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 310-314. Research supported by the Caja de Ahorros d

Astronomy and Astrophysics

Astronomy

39

Dwarf Galaxies, Irregular Galaxies, Local Group (Astronomy), Metallicity, Emission Spectra, Forbidden Transitions, Galactic Mass, Neon, Oxygen Ions

Scientific paper

Ionic abundances for two irregular dwarf galaxies belonging to the Local Group, GR 8 and Sextans B, are presented. The oxygen abundances have been found to be 0.055 solar masses and 0.16 solar mass, respectively. The Ne(2+)/O(2+) abundance ratio is within the range of what is observed for other irregular galaxies but the N(+)/O(+) and the S(+)/O(+) ratios are significantly lower. In one of the H II regions observed in GR 8 the helium content is higher than in the others. Two possibilities, pollution of the interstellar medium and a preferential loss of metals by the galaxy, are discussed. Data for both galaxies fit well the total mass-metallicity relation as given by Talent (1980).

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