Interstellar Medium Abundances in the Pegasus Dwarf Irregular Galaxy

Details Interstellar Medium Abundances in the Pegasus Dwarf Irregular Galaxy Interstellar Medium Abundances in the Pegasus Dwarf Irregular Galaxy

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474..205s&link_type=abstract

Astrophysical Journal v.474, p.205

Astronomy and Astrophysics

Astronomy

54

Galaxies: Abundances, Galaxies: Individual Name: Pegasus Dwarf Irregular Galaxy, Galaxies: Irregular, Galaxies: Ism, Galaxies: Local Group

Scientific paper

We report H alpha imaging and optical spectrophotometry of a faint H II region in the Pegasus dwarf irregular galaxy, a low-luminosity, possible Local Group member. We find that the emission-line spectrum is consistent with excitation by a single star with a temperature of less than 35,000 K, in agreement with Aparicio & Gallart (1995). Although we cannot measure the electron temperature of the ionized gas directly, we can infer a narrow range in electron temperature by comparing the emission-line spectrum with photoionization models. Then we derive a relatively low oxygen abundance of approximately 10% of the solar value, in accordance with the well-known metallicity-luminosity relationship for dwarf irregular galaxies. We also find an N/O ratio of 6%, which is higher than the typical value of 3% found in more actively star-forming dwarf irregular galaxies. By comparing this high N/O ratio with the recent star formation history of the Pegasus dwarf irregular derived by Aparicio & Gallart, we hypothesize that this may be evidence of delayed N production.

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