G. Clementini - Academia.edu (original) (raw)

Papers by G. Clementini

arXiv: Solar and Stellar Astrophysics, 2019

Stellar variability studies are now reaching a completely new level thanks to ESA's Gaia miss... more Stellar variability studies are now reaching a completely new level thanks to ESA's Gaia mission, which enables us to locate many variable stars in the Hertzsprung-Russell diagram and determine the various instability strips/bands. Furthermore, this mission also allows us to detect, characterise and classify many millions of new variable stars thanks to its very unique nearly simultaneous multi-epoch survey with different instruments (photometer, spectro-photometer, radial velocity spectrometer). An overview of what can be found in literature in terms of mostly data products by the Gaia consortium is given. This concerns the various catalogues of variable stars derived from the Gaia time series and also the location and motion of variable stars in the observational Hertzsprung-Russell diagram. In addition, we provide a list of a few thousands of variable white dwarf candidates derived from the DR2 published data, among them probably many hundreds of new pulsating white dwarfs. O...

Stellar Populations, 1995

Bulletin of the …, 2010

The Oosterhoff Dichotomy in the Milky Way and Other Local Group Galaxies ... Horace A. Smith1, M.... more The Oosterhoff Dichotomy in the Milky Way and Other Local Group Galaxies ... Horace A. Smith1, M. Catelan2, G. Clementini3, C. Kuehn1, B. Pritzl4, TC Beers1, N. De Lee5, K. Kinemuchi5, C. Greco6, V. Ripepi7, M. Marconi7, I. Musella7,

Arxiv preprint arXiv: …, 2008

As first Paper of a series devoted to study the old stellar population in clusters and fields in ... more As first Paper of a series devoted to study the old stellar population in clusters and fields in the Small Magellanic Cloud, we present deep observations of NGC 121 in the F555W and F814W filters, obtained with the Advanced Camera for Surveys on the Hubble Space ...

Monthly Notices of the Royal Astronomical Society

Cornell University - arXiv, Apr 26, 2022

Astronomy & Astrophysics, 2022

Context. Classical Cepheids (DCEPs) represent a fundamental tool to calibrate the extragalactic d... more Context. Classical Cepheids (DCEPs) represent a fundamental tool to calibrate the extragalactic distance scale. However, they are also powerful stellar population tracers in the context of Galactic studies. The forthcoming Data Release 3 of the Gaia mission will allow us to study, with unprecedented detail, the structure, the dynamics, and the chemical properties of the Galactic disc, and in particular of the spiral arms, where most Galactic DCEPs reside. Aims. In this paper we aim to quantify the metallicity dependence of the Galactic DCEPs’ period-Wesenheit (PWZ) relation in the Gaia bands. Methods. We adopted a sample of 499 DCEPs with metal abundances from high-resolution spectroscopy, in conjunction with Gaia Early Data Release 3 parallaxes and photometry to calibrate a PWZ relation in the Gaia bands. Results. We find a significant metallicity term, of the order of −0.5 mag dex−1, which is larger than the values measured in the near-infrared (NIR) bands by different authors. Ou...

The files contains lists of possible members of each of the objects (75 globular clusters, 9 dwar... more The files contains lists of possible members of each of the objects (75 globular clusters, 9 dwarf spheroidal galaxies, the Bootes I UFD, the LMC and SMC). The stars in these lists have been selected and used to determine the astrometric parameters of the corresponding objects following either the procedures described in Sec. 2.1 (for the clusters and dwarfs) or in Sec. 2.2 (for the LMC and SMC). The first column is the "source_id" as given by Gaia, the ra and declination of the star in degrees, and its G-band magnitude (known as "photgmean_mag" in the Gaia archive). (2 data files).

International Astronomical Union Colloquium, 2004

We present an overview of our study of the short period variable stars in the Large Magellanic Cl... more We present an overview of our study of the short period variable stars in the Large Magellanic Cloud, and in the dwarf galaxies Fornax, Leo I, and NGC 6822. Light curves are presented for RR Lyrae stars, Anomalous Cepheids and, for the first time, for Dwarf Cepheids in the field and in the globular cluster #3 of the Fornax galaxy.

Proceedings of the International Astronomical Union, 2006

The Fornax Project aims at mapping the classical instability strip of the Fornax dwarf spheroidal... more The Fornax Project aims at mapping the classical instability strip of the Fornax dwarf spheroidal galaxy, from the faint Dwarf Cepheids (V ˜ 24-25 mag) to the bright Anomalous Cepheids (V ˜ 19 mag). To achieve this goal, deep B,V time-series photometry of the galaxy has been obtained with the Wide Field Imagers (WFIs) of the ESO 2.2 m and CTIO 4 m telescopes, and the Clay camera at the Magellan 6.5 m telescope. Preliminary results are presented on the Oosterhoff classification of the RR Lyrae stars identified in a northern portion of Fornax field and in three of its globular clusters.

We present the Johnson-Cousins B,V and I time series data obtained for 162 variable stars (135 RR... more We present the Johnson-Cousins B,V and I time series data obtained for 162 variable stars (135 RR Lyrae, 4 candidate Anomalous Cepheids, 11 Classical Cepheids, 11 eclipsing binaries and 1 delta Scuti star) in two 13x13 square arcmin areas close to the bar of the Large Magellanic Cloud. The photometric observations presented in this paper were carried out at the 1.54m Danish telescope located in La Silla, Chile, on the nights 4-7 January 1999, UT, and 23-24 January 2001, UT, respectively. In the paper we give coordinates, finding charts, periods, epochs, amplitudes, and mean quantities (intensity- and magnitude-averaged luminosities) of the variables with full coverage of the light variations, along with a discussion of the pulsation properties of the RR Lyrae stars in the sample. (8 data files).

Proceedings of the International Astronomical Union, 2006

We present a project devoted to a comprehensive study of the Small Magellanic Cloud (SMC) and of ... more We present a project devoted to a comprehensive study of the Small Magellanic Cloud (SMC) and of the Bridge toward the Large Magellanic Cloud. We plan to use the VLT Survey Telescope (VST) to image 65 squared degrees on both targets to V˜24.5 with S/N˜10 in two years. These observations, in conjunction with HST and VLT data will allow us

We have carried out an extensive observing campaign on the new dwarf spheroidal galaxies (dSphs) ... more We have carried out an extensive observing campaign on the new dwarf spheroidal galaxies (dSphs) recently discovered by the SDSS, with the aim of characterizing their stellar populations and structural properties, as well as their variable star content. First preliminary results are presented for the Canes Venatici II, the Coma and the Ursa Major II dSphs, based on data collected