Publications (18)
The Gaia spectrophotometric standard stars survey -- IV. Results of the absolute photometry campaign
G. Altavilla, S. Marinoni, E. Pancino +18
We present Johnson-Kron-Cousins BVRI photometry of 228 candidate spectrophotometric standard stars for the external (absolute) flux calibration of Gaia data. The data were gathered…
The Gaia spectrophotometric standard stars survey - III. Short-term variability monitoring
S. Marinoni, E. Pancino, G. Altavilla +14
We present the results of the short-term constancy monitoring of candidate Gaia Spectrophotometric Standard Stars (SPSS). We obtained time series of typically 1.24 hour - with samp…
Gaia data release 1: Principles of the photometric calibration of the G band
J. M. Carrasco, D. W. Evans, P. Montegriffo +24
Context. Gaia is an ESA cornerstone mission launched on 19 December 2013 aiming to obtain the most complete and precise 3D map of our Galaxy by observing more than one billion sour…
The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge
F. R. Ferraro, E. Dalessandro, A. Mucciarelli +9
Globular star clusters are compact and massive stellar systems old enough to have witnessed the entire history of our Galaxy, the Milky Way. Although recent results suggest that th…
The Gaia spectrophotometric standard stars survey -- V. Preliminary flux tables for the calibration of Gaia DR2 and (E)DR3
E. Pancino, N. Sanna, G. Altavilla +15
We present the flux tables of the spectro-photometric standard stars (SPSS) used to calibrate in flux the Gaia DR2 and (E)DR3 data releases. The latest SPSS grid version contains 1…
Gaia Data Release 1. Testing the parallaxes with local Cepheids and RR Lyrae stars
Gaia Collaboration, G. Clementini, L. Eyer +588
Parallaxes for 331 classical Cepheids, 31 Type II Cepheids and 364 RR Lyrae stars in common between Gaia and the Hipparcos and Tycho-2 catalogues are published in Gaia Data Release…
The puzzling properties of the Helium White Dwarf orbiting the millisecond pulsar PSR J1911-5958A in NGC 6752
G. Cocozza, F. R. Ferraro, A. Possenti +1
We have used phase-resolved high-resolution images and low resolution spectra taken at the ESO Very Large Telescope, to study the properties of the low-mass Helium White Dwarf comp…
SN 2002lt and GRB 021211: a SN/GRB Connection at z = 1
M. Della Valle, D. Malesani, S. Benetti +14
We present spectroscopic and photometric observations of the afterglow of GRB 021211 and the discovery of its associated supernova, SN 2002lt. The spectrum shows a broad feature (F…
Gaia Data Release 2: Observational Hertzsprung-Russell diagrams
Gaia Collaboration, C. Babusiaux, F. van Leeuwen +450
We highlight the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD). Gaia allows us to present many different HRDs, depending in partic…
The Gaia spectrophotometric standard stars survey. I. Preliminary results
E. Pancino, G. Altavilla, S. Marinoni +23
We describe two ground based observing campaigns aimed at building a grid of approximately 200 spectrophotometric standard stars (SPSS), with an internal ~1% precision and tied to…
The old, metal-poor, anticentre open cluster Trumpler 5
P. Donati, G. Cocozza, A. Bragaglia +4
As part of a long term programme, we analyse the evolutionary status and properties of the old and populous open cluster Trumpler 5 (Tr 5), located in the Galactic anticentre direc…
The Gaia spectrophotometric standard stars survey -II. Instrumental effects of six ground-based observing campaigns
G. Altavilla, S. Marinoni, E. Pancino +16
The Gaia SpectroPhotometric Standard Stars (SPSS) survey started in 2006, it was awarded almost 450 observing nights, and accumulated almost 100,000 raw data frames, with both phot…
The anticentre old open clusters Berkeley 27, Berkeley 34, and Berkeley 36: new additions to the BOCCE project
P. Donati, A. Bragaglia, M. Cignoni +2
In this paper we present the investigation of the evolutionary status of three open clusters: Berkeley 27, Berkeley 34, and Berkeley 36, all located in the Galactic anti-centre dir…
Gaia data release 1, the photometric data
F. van Leeuwen, D. W. Evans, F. De Angeli +91
Context. This paper presents an overview of the photometric data that are part of the first Gaia data release. Aims. The principles of the processing and the main characteristics o…
A puzzling millisecond pulsar companion in NGC 6266
G. Cocozza, F. R. Ferraro, A. Possenti +5
We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J17013006B in the globular cluster NGC 6266. A relatively bright star with an an…
The double RGB in M 2: C, N, Sr and Ba abundances
C. Lardo, E. Pancino, A. Mucciarelli +6
The globular cluster M 2 has a photometrically detected double red giant branch (RGB) sequence. We investigate here the chemical differences between the two RGBs in order to gain i…
Evidence for Supernova Signatures in the Spectrum of the Late-time Bump of the Optical Afterglow of GRB 021211
M. Della Valle, D. Malesani, S. Benetti +14
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occu…
Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
Gaia Collaboration, F. van Leeuwen, A. Vallenari +589
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry,…