HR 4049, also known as HD 89353 and AG Antliae, is a post-asymptotic-giant-branch star in the constellation Antlia. A very metal-poor star, it is surrounded by a thick unique circumbinary disk enriched in several molecules. With an apparent magnitude of 5.53, the star can readily be seen under ideal conditions. The star, located approximately 813 parsecs (2,650 ly) distant, has been found to be a binary star; however, likely the most unique feature about this star is its peculiar spectrum. The star appears, based on its spectrum in the Balmer series, to be a blue supergiant, although in reality it is an old low-mass star on the post-AGP phase of its life. The star is also undergoing intense mass-loss and is a unique variable, ranging between magnitudes 5.29 and 5.83 with a period of 429 days
Video HR 4049
References
Maps HR 4049
External links
- The Spatial Distribution of Grains Around the Dual Chemistry Post-AGB Star
- Synthetic post-AGB evolution
- Non-linear radiative models of post-AGB stars: Application to HD 56126
- Post-AGB stars as testbeds of nucleosynthesis in AGB stars
- The post-AGB evolution of AGB mass loss variations
Source of article : Wikipedia
0 Comments