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2003MNRAS.345..747M - Mon. Not. R. Astron. Soc., 345, 747-761 (2003/November-1)
RR Lyrae stars in four globular clusters in the Fornax dwarf galaxy.
MacKEY A.D. and GILMORE G.F.
Abstract (from CDS):
With a large sample of horizontal-branch variable stars available to us, we revise previous measurements of the horizontal-branch morphology in each cluster. The Fornax clusters most closely resemble the `young' galactic halo population defined by Zinn in that their horizontal-branch morphologies are systematically redder than many galactic clusters of similar metallicity. We also confirm the existence of the second-parameter effect among the Fornax clusters, most markedly between clusters 1 and 3. The edges of the instability strip are well defined in several of the Fornax clusters, and we are able to make measurements of the intrinsic V -I colours of these edges. Finally, we determine foreground reddening and distance estimates for each cluster. We find a mean distance modulus to the Fornax dwarf of (m -M)020.66±0.03 (random) ±0.15 (systematic). Our measurements are consistent with a line-of-sight depth of ∼8-10 kpc for this galaxy, which is in accordance with its dimensions as measured in the plane of the sky. This approximately spherical shape for Fornax is incompatible with tidal model explanations for the observed high internal stellar velocity dispersions in many dwarf spheroidal galaxies. Dark matter dominance is suggested.
Abstract Copyright: 2003 RAS
Journal keyword(s): stars: horizontal branch - stars: variables: other - globular clusters: general - galaxies: individual: Fornax dwarf spheroidal - galaxies: star clusters
VizieR on-line data: <Available at CDS (J/MNRAS/345/747): table2.dat table3.dat>
Nomenclature: Table 2: [MG2003] FNVNN N=15+42+99+40. Table 3: [MG2003] FNCNN N=1+3+6+3.
Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.
CDS comments: Stars in Tables 2 and 3 not processed in Simbad : no coordinates provided.
Simbad objects: 10
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