Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..473d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 473-480.
Other
28
Dwarf Galaxies, Galactic Structure, Globular Clusters, Metallicity, Radial Velocity, Stellar Spectra, Abundance, Emission Spectra, Spectral Methods, Stellar Motions
Scientific paper
The AAT FOCAP fiber system has been used to obtain spectra, centered at the Ca II IR-triplet, of 14 stars in the field of the recently discovered Sextans dwarf spheroidal galaxy. Radial velocities derived from these spectra indicate that six of the stars observed are Sextans members. Their velocities cluster closely about a value of 230 + or - 6 km/s which can be taken as the heliocentric velocity of this galaxy. This velocity, when corrected to the galactic rest frame, indicates that Sextans makes a contribution comparable to those of other dSph galaxies, such as Sculptor and Ursa Minor, to calculations of the mass of the galaxy's halo. The spectra of the Sextans members also yield an estimate of the mean abundance of this galaxy: a value of Fe/-Hl = -1.7 + or - 0.25 dex is suggested from a comparison of the line strengths with those of globular cluster stars. This value is higher than that expected for Sextans from the absolute magnitude-abundance relation, followed by the other galactic dSph galaxies.
Da Costa Gary S.
Hatzidimitriou Despina
Irwin Mary Jane
McMahon Richard G.
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