The effects of cluster environment on the chemical evolution of galaxies -- III. NGC 753

Autor:	Richard C. Henry, Chantal Balkowski, Michael Edmunds, V. Cayatte, Bernard Pagel
Rok vydání:	1996
Předmět:	Interstellar medium Physics Spiral galaxy Galaxy groups and clusters Space and Planetary Science Metallicity Astronomy and Astrophysics Emission spectrum Astrophysics Spectral line Galaxy Galaxy cluster
Zdroj:	Monthly Notices of the Royal Astronomical Society. 283:635-647
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/283.2.635
Popis:	We present new long-slit spectrophotometric measurements of 10 giant H II regions located in the Virgo spiral NGC 4254. Gradients in the emission-line ratios log R 23 , log [N II]/[O II] and log [S II]/[O II] are observed and provide the constraints for a photoionization analysis to determine disc abundance patterns for O/H, N/H and S/H. We find that log O/H+12=9.52(±0.1)−0.27(±0.05)ρ/ρ eff ; log N/H=8.62(±0.1)−0.38(±0.05)ρ/ρ eff ; and log S/H=7.70(±0.1)−0.27(±0.05)ρ/ρ eff . Adopting a distance of 18 Mpc to NGC 4254, the slopes become −0.06, −0.08 and −0.06 dex kpc −1 , respectively. The value of log O/H at the nucleus indicates that the disc of NGC 4254 has a very high metallicity relative to other spirals in its morphological class
Databáze:	OpenAIRE
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