Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arep...41..472z&link_type=abstract
Astronomy Reports, Volume 41, Issue 4, July 1997, pp.472-482
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The stellar population and evolutionary characteristics (metallicity of stellar components and stellar ages and mass functions) in the blue compact galaxy SBS 1331+493 are studied; this galaxy has a low heavy-element abundance and has experienced bursts of star formation. A new composite method for determining the stellar composition of galaxies is proposed. This method incorporates the advantages of both evolutionary studies and population synthesis. Long-slit spectra obtained on the 4-m telescope of Kitt Peak National Observatory are used for the analysis. The resulting ages for the last burst of star formation in four consecutive spatial zones are from 3.8 x 10^6 to 34 x 10^6 yr, corresponding to a velocity of 13 +/- 5 km/s for the corresponding wave of star formation. The metallicities of the stellar populations [Z / Z_solar] in different regions are from 0.96 to 0.76. The initial mass function Psi (M) ~ M^-alpha = 2.36 +/- 0.12 for all the regions studied.
Balinskaya I. S.
Kniazev Alexei Y.
Lipovetskii V. A.
Zenina O. A.
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