Two serendipitous low-mass lmc dusters discovered with hst
dc.contributor.author | Santiago, Basilio Xavier | pt_BR |
dc.contributor.author | Elson, Rebecca A.W. | pt_BR |
dc.contributor.author | Sigurdsson, Steinn | pt_BR |
dc.contributor.author | Gilmore, Gerard Fitzgerald | pt_BR |
dc.date.accessioned | 2014-03-13T01:50:38Z | pt_BR |
dc.date.issued | 1998 | pt_BR |
dc.identifier.issn | 0035-8711 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/88367 | pt_BR |
dc.description.abstract | We present V and I photometry of two open clusters in the LMC down to V~26. The clusters were imaged with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST), as part of the Medium Deep Survey Key Project. Both are low-luminosity (MV~-3.5), low-mass (M~10³Mо) systems. The chance discovery of these two clusters in two parallel WFPC2 fields suggests a significant incompleteness in the LMC cluster census near the bar. One of the clusters is roughly elliptical and compact, with a steep light profile, a central surface brightness µV(0)~20.2 mag arcsec-², a half-light radius rhl~0.9 pc (total visual major diameter D~3 pc) and an estimated mass M~1500 Mо. From the colour magnitude diagram and isochrone fits we estimate its age as Τ~(2–5)x10 8 yr. Its mass function has a fitted slope of Г = ∆logØ (M)/ ∆logM =-1.8±0.7 in the range probed (0.9<~M/Mо<~4.5). The other cluster is more irregular and sparse, having shallower density and surface brightness profiles. We obtain Г=-1.2±0.4, and estimate its mass as M~400 Mо. A derived upper limit for its age is t<~5x10 8 yr. Both clusters have mass functions with slopes similar to that of R136, a massive LMC cluster, for which HST results indicate Г~-1.2. They also seem to be relaxed in their cores and well contained in their tidal radii. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society. London. Vol. 295, no. 4 (Apr. 1998), p. 860-868 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Astrofisica extragalatica | pt_BR |
dc.subject | Stars:luminosity function, mass function | en |
dc.subject | Stars:statistics | en |
dc.subject | Grande Nuvem de Magalhães | pt_BR |
dc.subject | Magellanic clouds | en |
dc.subject | Hubble space telescope | pt_BR |
dc.subject | Galaxies: star clusters | en |
dc.title | Two serendipitous low-mass lmc dusters discovered with hst | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000014900 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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