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The Not so Simple S...
The Not so Simple Stellar System ω Cen. II. Evidence in Support of a Merging Scenario
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- Calamida, Annalisa (författare)
- Space Telescope Science Institute
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- Zocchi, Alice (författare)
- European Space Research and Technology Centre (ESA/ESTEC)
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- Bono, Giuseppe (författare)
- INAF-Osservatorio Astronomico di Roma,University of Rome Tor Vergata
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- Ferraro, Ivan (författare)
- INAF-Osservatorio Astronomico di Roma
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- Mastrobuono-Battisti, Alessandra (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Max Planck Institute for Astronomy
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- Saha, Abhijit (författare)
- National Optical Astronomy Observatory
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- Iannicola, Giacinto (författare)
- INAF-Osservatorio Astronomico di Roma
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- Rest, Armin (författare)
- Space Telescope Science Institute,Johns Hopkins University
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- Strampelli, Giovanni (författare)
- University of La Laguna (ULL),Johns Hopkins University
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- Zenteno, Alfredo (författare)
- Cerro Tololo Inter-American Observatory, NOAO
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(creator_code:org_t)
- 2020-03-17
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 891:2
- Relaterad länk:
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http://dx.doi.org/10...
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https://iopscience.i...
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https://lup.lub.lu.s...
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https://doi.org/10.3...
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Abstract
Ämnesord
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- We present multiband photometry covering ∼5° × 5° across ω Cen collected with the Dark Energy Camera on the 4 m Blanco telescope, combined with Hubble Space Telescope and Wide Field Imager data for the central regions. The unprecedented photometric accuracy and field coverage allows us to confirm the different spatial distribution of blue and red main-sequence stars, and of red giant branch (RGB) stars with different metallicities. The ratio of the number of blue to red main-sequence stars shows that the blue main-sequence stellar subpopulation has a more extended spatial distribution compared to the red main-sequence one, with the frequency of blue main-sequence stars increasing at a distance of ∼20′ from ω Cen's center. Similarly, the more metal-rich RGB stars show a more extended spatial distribution compared to the more metal-poor ones in the outskirts of the cluster. Moreover, the centers of the distributions of metal-rich and metal-poor RGB stars are shifted in different directions with respect to the geometrical center of ω Cen. We constructed stellar density profiles for the blue and red main-sequence stars; they show that the blue main-sequence stellar subpopulation has a more extended spatial distribution compared to the red main-sequence one in the outskirts of ω Cen, confirming the results based on the number ratio. We also computed the ellipticity profile of ω Cen, which has a maximum value of 0.16 at a distance of ∼8′ from the center, and a minimum of 0.05 at ∼30′; the average ellipticity is ∼0.10. The circumstantial evidence presented in this work suggests a merging scenario for the formation of the peculiar stellar system ω Cen.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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