The structure and stellar content of the central region of M33

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dc.contributor.authorStephens, AW
dc.contributor.authorFrogel, JA
dc.date.accessioned2025-01-21T01:10:29Z
dc.date.available2025-01-21T01:10:29Z
dc.date.issued2002
dc.description.abstractUsing Gemini QuickStart infrared observations of the central 22" of M33, we analyze the stellar populations in this controversial region. Based on the slope of the giant branch we estimate the mean metallicity to be -0.26+/-0.27, and from the luminosities of the most luminous stars, we estimate that there were two bursts of star formation, similar to2 and similar to0.5 Gyr ago. We show that the stellar luminosity function not has only a different bright end cutoff, but also a significantly different slope than that of the Galactic bulge, and we suggest that this difference is due to the young stellar component in M33. We combine our infrared Gemini data with optical Hubble Space Telescope Wide Field Planetary Camera 2 measurements revealing a color-magnitude diagram populated with young, intermediate-age, and old stellar populations. Using surface brightness profiles from 0".1 to 18', we perform simple decompositions and show that the data are best fitted by a three-component core plus bulge plus disk model. Finally, we find no evidence for radial variations of the stellar populations in the inner 3"-10" of M33, based on a spatial analysis of the color-magnitude diagrams and luminosity functions.
dc.fuente.origenWOS
dc.identifier.issn0004-6256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96690
dc.identifier.wosidWOS:000178143400015
dc.issue.numero4
dc.language.isoen
dc.pagina.final2038
dc.pagina.inicio2023
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectgalaxies : individual ( M33, NCG 598)
dc.titleThe structure and stellar content of the central region of M33
dc.typeartículo
dc.volumen124
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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