| Abstrakt: |
We investigate the stellar population content in the lenticular galaxies NGC 1023, NGC 3115 and NGC 4203 applying a population synthesis method based on a seven component spectral basis with different ages – $2.5\times10^6$, $10\times10^6$, $25\times10^6$, $75\times10^6$, $200\times10^6$, $1.2\times10^9$and older than 1010years, and metallicity in the range $-1.3\leq$$[Z/Z_{\odot}]$$\leq-0.2$. This study employs two-dimensional STIS spectra in the range $\lambda\lambda$2900–5700 Å, obtained from the Hubble Space Telescope public archives. We extracted one-dimensional spectra in adjacent windows 100 pc wide (projected distance) from the nuclear regions up to 300–400 pc. The largest contribution, both in λ5870 Å flux and mass fraction, comes from old stars (age $>10^{10}$years). We verified the possible existence of circumnuclear bursts (CNBs) in NGC 3115 and NGC 4203. |
