Na-O Anticorrelation and HB. VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra
- E. CarrettaA. Bragaglia E. Sabbi
- 16 September 2009
Physics, Chemistry
We present abundances of Fe, Na, and O for 1409 red giant stars in 15 galactic globular clusters (GCs), derived from the homogeneous analysis of high-resolution FLAMES/GIRAFFE spectra. Combining the…
Gaia Data Release 2. Summary of the contents and survey properties
- A. BrownA. Vallenari T. Zwitter
- 25 April 2018
Physics
We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than…
Gaia Data Release 2
- F. SpotoP. Tanga T. Zwitter
- 25 April 2018
Physics
The dramatic improvement brought by Gaia DR2 astrometry of SSOs is demonstrated by comparisons to the archive data and by preliminary tests on the detection of subtle non-gravitational effects.
Gaia Data Release 2
- Gaia CollaborationC. Babusiaux T. Zwitter
- 25 April 2018
Physics
The internal analysis of the data shows that the photometric calibrations can reach a precision as low as 2 mmag on individual CCD measurements, and other tests show that systematic effects are present in the data at the 10 mmag level.
A Step toward the Calibration of the Red Giant Branch Tip as a Standard Candle
- M. BellazziniF. FerraroE. Pancino
- 6 April 2001
Physics
The absolute I magnitude of the tip of the red giant branch (M) is one of the most promising standard candles actually used in astrophysics as a fundamental pillar for the cosmological distance…
Gaia Early Data Release 3
Context. Gaia Early Data Release 3 (Gaia EDR3) contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency Gaia satellite…
The Gaia mission
- T. PrustiJ. Bruijne S. Zschocke
- 1 March 2013
Engineering, Physics
Gaia is a cornerstone mission in the science programme of the EuropeanSpace Agency (ESA). The spacecraft construction was approved in 2006, following a study in which the original interferometric…
The calibration of the RGB Tip as a Standard Candle Extension to Near Infrared colors and higher metallicity
- M. BellazziniF. FerraroA. SollimaA. SollimaE. PancinoL. Origlia
- 29 April 2004
Physics
New empirical calibrations of the Red Giant Branch Tip in the I, J, H and K bands based on two fundamental pillars, namely ω Centauri and 47 Tucanae, have been obtained by using a large optical and…
Gaia Early Data Release 3: Structure and properties of the Magellanic Clouds
- Gaia CollaborationA. Brown T. Zwitter
- 3 December 2020
Physics, Environmental Science
We compare the Gaia DR2 and Gaia EDR3 performances in the study of the Magellanic Clouds and show the clear improvements in precision and accuracy in the new release. We also show that the…
Metallicities, Relative Ages, and Kinematics of Stellar Populations in ω Centauri
- A. SollimaE. PancinoF. FerraroM. BellazziniO. StranieroL. Pasquini
- 5 September 2005
Physics
We present results of an extensive spectroscopic survey of subgiant stars in the stellar system ω Cen. Using infrared Ca II triplet lines, we derived metallicities and radial velocities for more than…
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