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21 papers
Study of the variable star ASASSN-V j104912.47+274312.7; a rare peculiar RRc star
M. Correa, J. M. Vilalta, J. F. Le Borgne
During a screening in ASAS-SN database searching candidates of Delta Scuti stars with short period, our attention was drawn to the variable star ASASSN-V J104912.47+274312.7, we co…
The magnificent past of RR Lyrae variables
Ennio Poretti, Jean-Francois Le Borgne, Alain Klotz +2
The history of the observations of RR Lyr variables started in the XIXth century, more than 120 years ago. The very long time baseline of available data combined with the short per…
CoRoT space photometry of seven Cepheids
Ennio Poretti, Jean-Francois Le Borgne, Monica Rainer +4
A few Galactic classical Cepheids were observed in the programmes of space missions as Coriolis, MOST and Kepler. An appealing opportunity was to detect additional nonradial modes,…
The star RR Lyr and the Cepheid variables in the era of the space photometry revolution
Ennio Poretti, Jean-Francois Le Borgne, Alain Klotz
The long-term behaviours of the pulsation and Blazhko periods of RR Lyr are investigated by means of Kepler and ground-based observations. The difficulties in detecting additional…
The space photometry revolution and our understanding of RR Lyrae stars
R. Szabó, J. M. Benkő, M. Paparó +7
The study of RR Lyrae stars has recently been invigorated thanks to the long, uninterrupted, ultra-precise time series data provided by the Kepler and CoRoT space telescopes. We gi…
GEOS RR Lyr survey: FM Del is indeed a cepheid
Jean-Francois Le Borgne, Alain Klotz
Though FM Del has been considered as a RR Lyr star by Preston et al. in 1959 (following discovery by Huth, 1957), Huth (1960) eventually changed his mind by showing that it is in f…
The historical vanishing of the Blazhko effect of RR Lyr from GEOS and Kepler surveys
J. F. Le Borgne, E. Poretti, A. Klotz +20
RR Lyr is one of the most studied variable stars. Its light curve has been regularly monitored since the discovery of the periodic variability in 1899. Analysis of all observed max…
A peculiar galaxy appears at redshift 11: properties of a moderate redshift interloper
Matthew Hayes, Nicolas Laporte, Roser Pello +2
Laporte et al. (2011) reported a very high redshift galaxy candidate: a lensed J-band dropout (A2667-J1). J1 has a photometric redshift of z=9.6-12, the probability density functio…
The all-sky GEOS RR Lyr survey with the TAROT telescopes. Analysis of the Blazhko effect
J. -F. Le Borgne, A. Klotz, E. Poretti +9
We used the GEOS database to study the Blazhko effect of galactic RRab stars. The database is continuously enriched by maxima supplied by amateur astronomers and by a dedicated sur…
Evolutionary changes in the periods of galactic RRab stars
Jacqueline Vandenbroere, Ennio Poretti, Jean-Francois Le Borgne
Le Borgne et al. (2007) report on the determination of evolutionary changes in the periods of field RR Lyr stars. Thanks to the extension of the GEOS database, we could analyze a s…
Optical dropout galaxies lensed by the cluster A2667
Nicolas Laporte, Roser Pelló, Daniel Schaerer +8
We investigate the nature and the physical properties of z, Y and J-dropout galaxies selected behind the lensing cluster A2667. This field is part of our project aimed at identifyi…
CoRoT light curves of RR Lyrae stars. CoRoT 101128793: long-term changes in the Blazhko effect and excitation of additional modes
Ennio Poretti, Margit Paparo, Magali Deleuil +13
The CoRoT (Convection, Rotation and planetary Transits) space mission provides a valuable opportunity to monitor stars with uninterrupted time sampling for up to 150 days at a time…
Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
Y. Peng, S. J. Lilly, K. Kovac +61
We explore the inter-relationships between mass, star-formation rate and environment in the SDSS, zCOSMOS and other surveys. The differential effects of mass and environment are co…
Spectrophotometric properties of galaxies at intermediate redshifts (z ~ 0.2--1.0) II. The Luminosity -- Metallicity relation
Fabrice Lamareille, Thierry Contini, Jarle Brinchmann +3
We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts (). The sample selection, the spectroscopic observati…
Looking for z>7 galaxies with the Gravitational Telescope
R. Pello, J. Richard, D. Schaerer +3
We summarize the main results obtained recently by our group on the identification and study of very high-z galaxies (z>7) using lensing clusters as natural gravitational telescope…
ISAAC/VLT observations of a lensed galaxy at z=10.0
R. Pello, D. Schaerer, J. Richard +2
We report the first likely spectroscopic confirmation of a z 10.0 galaxy from our ongoing search for distant galaxies with ISAAC/VLT. Galaxy candidates at z >~ 7 are selected from…
STELIB: a library of stellar spectra at R~2000
J. -F. Le Borgne, G. Bruzual, R. Pello +6
We present STELIB, a new spectroscopic stellar library, available at http://webast.ast.obs-mip.fr/stelib . STELIB consists of an homogeneous library of 249 stellar spectra in the v…
A ring galaxy at z=1 lensed by the cluster Abell 370
G. Soucail, J. P. Kneib, J. Bezecourt +3
We present a study of a very peculiar object found in the field of the cluster-lens Abell 370. This object displays, in HST imaging, a spectacular morphology comparable to nearby r…
Spectroscopic Confirmation of Redshifts Predicted by Gravitational Lensing
Tim Ebbels, Richard Ellis, Jean-Paul Kneib +4
We present deep spectroscopic measurements of 18 distant field galaxies identified as gravitationally-lensed arcs in a Hubble Space Telescope image of the cluster Abell 2218. Redsh…
X-ray analysis and matter distribution in the lens-cluster Abell 2390
M. Pierre, J. F. Le Borgne, G. Soucail +1
We present a deep X-ray ROSAT/HRI observation of the rich cluster-lens Abell 2390 and the analysis of the gas and matter distribution in the cluster. The X-ray centroid coincides w…
Dynamics of Abell 2218 from optical and near-IR imagery of arc(let)s and ROSAT/HRI X-ray map
J. -P. Kneib, Y. Mellier, R. Pello +4
A mass model of the rich cluster A2218 is presented based on optical and new near-infrared images of arc(let)s and the ROSAT/HRI X-ray map. A lensing model is proposed with two dar…