Bibcode
Moles, M.; Aparicio, A.; Masegosa, J.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 2, Feb. 1990, p. 310-314. Research supported by the Caja de Ahorros de Granada and Ministerio de Educacion y Ciencia of Spain.
Fecha de publicación:
2
1990
Número de citas
41
Número de citas referidas
37
Descripción
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).