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Spectroscopy of Red Giants of the Sagittarius Dwarf Galaxy

Published online by Cambridge University Press:  25 May 2016

G. Marconi ,
P. Bonifacio ,
L. Pasquini  and
P. Molaro
G. Marconi
Affiliation:
Osservatorio Astronomico di Roma
P. Bonifacio
Affiliation:
Osservatorio Astronomico di Trieste
L. Pasquini
Affiliation:
European Southern Observatory
P. Molaro
Affiliation:
Osservatorio Astronomico di Trieste

Abstract

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The photometric study of the Sagittarius dwarf galaxy by Marconi et al. (1998) has suggested the presence of a spread in metallicity (-0.7 ≤ [Fe/H] ≤ −1.6), which may result from different bursts of star formation. We present the results from a Multi Object Slit spectroscopy program carried out at the NTT with the aim to determine spectroscopic abundances of Sagittarius giants selected from the CCD photometry. From our intermediate resolution (R~1500) spectra, radial velocities are determined to confirm the membership and metallicities are derived by using spectral synthesis codes for stars down to V ~ 18, i.e. below the RGB clump. Out of 57 observed stars, 23 have a radial velocity consistent with Sagittarius membership; here we present results for 8 of these. No star with [Fe/H]< −1.0 is found, three stars are found to be metal-rich.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 129 - 135
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Alonso, A., Arribas, S., Martinez-Roger, C. 1996, A&AS, 117, 227 Google Scholar
Francois, P., Danziger, J.I., Buonanno, R., Perrin, N.M. 1997, A&A, 327, 121 Google Scholar
Ibata, R.A., Gilmore, G., Irwin, M.J. 1994, Nature, 370, 194 CrossRefGoogle Scholar
Ibata, R.A., Gilmore, G., Irwin, M.J. 1995, MNRAS, 277, 781 CrossRefGoogle Scholar
Ibata, R.A., Wyse, R.F.G., Gilmore, G., Irwin, M.J., Suntzeff, N.B. 1997, AJ, 113, 634 CrossRefGoogle Scholar
Kurucz, R.L. 1993, CD-ROM No. 13, 18 Google Scholar
Kurucz, R.L., Furenlid, I., Brault, J., Testerman, L. 1984, Solar Flux Atlas from 296 to 1300 nm, Nat. Sol. Obs., Atlas No. 1 Google Scholar
Marconi, G., Buonanno, R., Castellani, M., Iannicola, P., Molaro, P., Pasquini, L., Pulone, L. 1998, A&A, 330, 453 Google Scholar
McWilliam, A., Rich, R.M. 1994, ApJS, 91, 749 CrossRefGoogle Scholar
Smecker-Hane, T., McWilliam, A., Ibata, R.A. 1998, AAS Meeting, 192, 6613 Google Scholar
Straniero, O., Chieffi, A., Limongi, M. 1997, ApJ, 490, 425 CrossRefGoogle Scholar