Publications (23)
A Science4Peace initiative: Alleviating the consequences of sanctions in international scientific cooperation
A. Ali, M. Barone, S. Brentjes +23
The armed invasion of Ukraine by the Russian Federation has adversely affected the relations between Russia and Western countries. Among other aspects, it has put scientific cooper…
EROS VARIABLE STARS : FUNDAMENTAL-MODE AND FIRST OVERTONE CEPHEIDS IN THE BAR OF THE LARGE MAGELLANIC CLOUD
J. P. Beaulieu, P. Grison, W. Tobin +27
We present CCD phase-binned light curves at 490 nm for 97 Cepheid variable stars in the bar of the LMC. The photometry was obtained as part of the French EROS project and has excel…
SEARCH FOR VERY LOW MASS OBJECTS IN THE GALACTIC HALO
EROS collaboration, E. Aubourg, P. Bareyre +26
We present results from a search for gravitational microlensing of stars in the Large Magellanic Cloud by low mass objects in the Galactic Halo. The search uses the CCD light curve…
Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
P. Tisserand, L. Le Guillou, C. Afonso +35
The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called ``machos'') could be a major component of the dark matter halo of the Milky…
New limits from microlensing on Galactic Black Holes in the mass range
T. Blaineau, M. Moniez, C. Afonso +17
We have searched for long duration microlensing events originating from intermediate mass Black Holes (BH) in the halo of the Milky Way, using archival data from EROS-2 and MACHO p…
Beyond a Year of Sanctions in Science
M. Albrecht, A. Ali, M. Barone +12
While sanctions in political and economic areas are now part of the standard repertoire of Western countries (not always endorsed by UN mandates), sanctions in science and culture…
Type Ia supernova rate at a redshift of ~ 0.1
G. Blanc, C. Afonso, C. Alard +58
We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement o…
Observational Limits on Machos in the Galactic Halo
EROS collaboration, C. Renault, C. Afonso +40
We present final results from the first phase of the EROS search for gravitational microlensing of stars in the Magellanic Clouds by unseen deflectors (machos: MAssive Compact Halo…
The EROS2 search for microlensing events towards the spiral arms: the complete seven season results
Y. R. Rahal, C. Afonso, J. -N. Albert +36
The EROS-2 project has been designed to search for microlensing events towards any dense stellar field. The densest parts of the Galactic spiral arms have been monitored to maximiz…
R Coronae Borealis stars in the Galactic Bulge discovered by EROS-2
P. Tisserand, J. B. Marquette, P. R. Wood +33
Rare types of variable star may give unique insight into short-lived stages of stellar evolution. The systematic monitoring of millions of stars and advanced light curve analysis t…
Galactic Bulge Microlensing Optical Depth from EROS-2
C. Hamadache, L. Le Guillou, P. Tisserand +34
We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of clump-giant stars distributed over of…
Charting the European Course to the High-Energy Frontier
U. Amaldi, E. Aslanides, R. Barate +50
We review the capabilities of two projects that have been proposed as the next major European facility, for consideration in the upcoming update of the European Strategy for Partic…
Type Ia supernova rate at
D. Hardin, C. Afonso, C. Alard +44
We present the EROS nearby supernova () search and the analysis of the first year of data (1997). A total of 80 square degrees were surveyed. Eight supernovæ we…
New Magellanic Cloud R Coronae Borealis and DY Per type stars from the EROS-2 database: the connection between RCBs, DYPers and ordinary carbon stars
P. Tisserand, P. R. Wood, J. B. Marquette +29
R Coronae Borealis stars (RCB) are a rare type of evolved carbon-rich supergiant stars that are increasingly thought to result from the merger of two white dwarfs, called the Doubl…
The effect of metallicity on the Cepheid distance scale and its implications for the Hubble constant () determination
J. P. Beaulieu, D. D. Sasselov, C. Renault +30
Recent HST determinations of the expansion's rate of the Universe (the Hubble constant, H_0) assumed that the Cepheid Period-Luminosity relation at V and I are independent of metal…
Metallicity Effects on the Cepheid Extragalactic Distance Scale from EROS photometry in LMC and SMC
D. D. Sasselov, J. P. Beaulieu, C. Renault +30
This is an investigation of the period-luminosity relation of classical Cepheids in samples of different metallicity. It is based on 481 Cepheids in the Large and Small Magellanic…
Spectroscopic Studies of the Two Eros Candidate Microlensed Stars
J. P. Beaulieu, R. Ferlet, Ph. Grison +26
Low resolution spectroscopy, and UBVRI photometry, have been obtained for the two EROS microlensing candidates. Radial velocities indicate that both stars are members of the Large…
Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud
J. B. Marquette, P. Tisserand, P. Francois +37
For seven years, the EROS-2 project obtained a mass of photometric data on variable stars. We present a peculiar Cepheid-like star, in the direction of the Small Magellanic Cloud,…
First Look at the Physics Case of TLEP
M. Bicer, H. Duran Yildiz, I. Yildiz +128
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV and with measured properties compatible with those of a Standard-Model Higgs boson, coupled w…
The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database
J. B. Marquette, J. P. Beaulieu, J. R. Buchler +36
A number of microlensing dark-matter surveys have produced tens of millions of light curves of individual background stars. These data provide an unprecedented opportunity for syst…
Kinematics of LMC stellar populations and self-lensing optical depth
P. Salati, R. Taillet, E. Aubourg +2
Recent observations give some clues that the lenses discovered by the microlensing experiments in the direction of the Magellanic Clouds may be located in these satellite galaxies.…
Microlensing Optical Depth of the Large Magellanic Cloud
E. Aubourg, N. Palanque-Delabrouille, P. Salati +2
The observed microlensing events towards the LMC do not have yet a coherent explanation. If they are due to Galactic Halo objects, the nature of these objects is puzzling --- half…
EROS Variable Stars : Discovery of Beat Cepheids in the Small Magellanic Cloud and the effect of metallicity on pulsation
J. P. Beaulieu, M. Krockenberger, D. D. Sasselov +27
We report the discovery of eleven beat Cepheids in the Small Magellanic Cloud, using data obtained by the EROS microlensing survey. Four stars are beating in the fundamental and fi…