Deep <i>Hubble Space Telescope</i> STIS color-magnitude diagrams of the dwarf irregular galaxy WLM

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dc.contributor.authorRejkuba, M
dc.contributor.authorMinniti, D
dc.contributor.authorGregg, MD
dc.contributor.authorZijlstra, AA
dc.contributor.authorAlonso, MV
dc.contributor.authorGoudfrooij, P
dc.date.accessioned2025-01-21T01:31:15Z
dc.date.available2025-01-21T01:31:15Z
dc.date.issued2000
dc.description.abstractWe have obtained V- and I-band photometry for 1886 stars down to I = 27 and y = 28 in the held of the dwarf irregular galaxy WLM, using deep Space Telescope Imaging Spectrograph (STIS) CL- and LP-band images taken in the parallel mode with the Hubble Space Telescope. The photometry is used to study the horizontal branch identified in WLM. The horizontal branch, extending blueward from the red giant clump, is an unambiguous signature of an old population. We demonstrate that it is possible to reach the horizontal branch of an old population at a distance of similar or equal to 1 Mpc using STIS, with relatively short exposure times. From the VI color-magnitude diagram, we obtain an accurate distance modulus (m - M)(0) = 24.95 +/- 0.13 for WLM by using the Y magnitude of the horizontal branch, and by adopting E(V-I)= 0.03. The implications are that (1) WLM formed stars at high redshift and (2) the old population of WLM can be representative of a protogalactic fragment, related to those accreted to form the Milky Way halo.
dc.fuente.origenWOS
dc.identifier.issn0004-6256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97021
dc.identifier.wosidWOS:000089040800023
dc.issue.numero2
dc.language.isoen
dc.pagina.final809
dc.pagina.inicio801
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectgalaxies : individual (WLM = DDO 221=A2359-1544=UGCA 444)
dc.subjectgalaxies : irregular
dc.subjectgalaxies : stellar content
dc.subjectLocal Group
dc.titleDeep <i>Hubble Space Telescope</i> STIS color-magnitude diagrams of the dwarf irregular galaxy WLM
dc.typeartículo
dc.volumen120
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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