Recent, high precision photometry of Omega Centauri, the biggest Galactic globular cluster, has been obtained with Hubble Space Telescope. The color magnitude diagram reveals an unexpected bifurcation of colors in the main sequence (MS). The newly found double MS, the multiple turnoffs and subgiant branches, and other sequences discovered in the past along the red giant branch of this cluster add up to a fascinating but frustrating puzzle. Among the possible explanations for the blue main sequence an anomalous overabundance of helium is suggested. The hypothesis will be tested with a set of FLAMES@VLT data we have recently obtained (ESO DDT program), and with forthcoming ACS@HST images
In this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue m...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...
Abstract. Recent, high precision photometry of Omega Centauri, the biggest Galactic glob-ular cluste...
We present Hubble Space Telescope observations that show a bifurcation of colors in the middle main ...
We present the results of a deep photometric survey performed with FORS1@VLT aimed at investigating ...
We present Hubble Space Telescope observations that show a bifurcation of colors in the middle main ...
Using deep high-resolution multi-band images taken with the Very Large Telescope and the Hubble Spac...
We revisit the problem of the split main sequence (MS) of the globular cluster \u3c9 Centauri, and r...
Using deep high-resolution multiband images taken with the Very Large Telescope and the Hubble Space...
Recent observational studies of ω Centauri by the Hubble Space Telescope have discovered a double ma...
The origin of a double main-sequence (MS) in omega Centauri is explored. We have shown from theoreti...
Recent observations for the color-magnitude diagrams (CMDs) of the massive globular cluster Omega Ce...
We present the results of a deep photometric survey performed with the VLT FORS1 aimed at investigat...
As part of a large investigation with Hubble Space Telescope to study the faintest stars within the ...
In this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue m...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...
Abstract. Recent, high precision photometry of Omega Centauri, the biggest Galactic glob-ular cluste...
We present Hubble Space Telescope observations that show a bifurcation of colors in the middle main ...
We present the results of a deep photometric survey performed with FORS1@VLT aimed at investigating ...
We present Hubble Space Telescope observations that show a bifurcation of colors in the middle main ...
Using deep high-resolution multi-band images taken with the Very Large Telescope and the Hubble Spac...
We revisit the problem of the split main sequence (MS) of the globular cluster \u3c9 Centauri, and r...
Using deep high-resolution multiband images taken with the Very Large Telescope and the Hubble Space...
Recent observational studies of ω Centauri by the Hubble Space Telescope have discovered a double ma...
The origin of a double main-sequence (MS) in omega Centauri is explored. We have shown from theoreti...
Recent observations for the color-magnitude diagrams (CMDs) of the massive globular cluster Omega Ce...
We present the results of a deep photometric survey performed with the VLT FORS1 aimed at investigat...
As part of a large investigation with Hubble Space Telescope to study the faintest stars within the ...
In this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue m...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...
High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of ...