Origin and evolution of the bulge of our Galaxy
Abstract
The modern observations of planetary nebulae (PNe) are used to recalculate the element abundances for more than 150 PNe of the Milky Way and Magellanic Clouds. Based on our data, we study the evolution of the abundance gradients for PNe in the thin disk and in the bulge. We show that abundances are similar for PNe in the bulge and PNe of Peimbert's type II whose progenitor stars belong to the population of the thin disk with the ages greater than 4--6 Gyrs. We put forward the scenario of the star formation in the thin disk and bulge. We suppose that the intense star formation both in the bulge and in the thin disk do not stop at least up to 4--6 Gyr ago.
- Publication:
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Astronomical and Astrophysical Transactions
- Pub Date:
- 2012
- Bibcode:
- 2012A&AT...27..369K
- Keywords:
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- Galactic bulge: planetary nebulae;
- Magellanic Clouds: planetary nebulae