Search Publications
Three-dimensional mapping of the local interstellar medium with composite data
Monreal-Ibero, A.; Elyajouri, M.; Lallement, R. +2 more
Context. Three-dimensional maps of the Galactic interstellar medium are general astrophysical tools. Reddening maps may be based on the inversion of color excess measurements for individual target stars or on statistical methods using stellar surveys. Three-dimensional maps based on diffuse interstellar bands (DIBs) have also been produced. All me…
Understanding EROS2 observations toward the spiral arms within a classical Galactic model framework
Moniez, M.; Rahvar, S.; Ansari, R. +2 more
Aims: EROS (Expérience de Recherche d'Objets Sombres) has searched for microlensing toward four directions in the Galactic plane away from the Galactic center. The interpretation of the catalog optical depth is complicated by the spread of the source distance distribution. We compare the EROS microlensing observations with Galactic models (in…
Chemical tagging of the Ursa Major moving group. A northern selection of FGK stars
Montes, D.; González Hernández, J. I.; Tabernero, H. M. +1 more
Context. Stellar kinematic groups are kinematically coherent groups of stars that might have a common origin. These groups spread through the Galaxy over time owing to tidal effects caused by Galactic rotation and disk heating. However, the chemical information survives these processes.
Aims: The information provided by analysis of chemical e…
Belt(s) of debris resolved around the Sco-Cen star HIP 67497
Pinte, C.; Ménard, F.; van der Plas, G. +15 more
Aims: In 2015, we initiated a survey of Scorpius-Centaurus A-F stars that are predicted to host warm-inner and cold-outer belts of debris similar to the case of the system HR 8799. The survey aims to resolve the disks and detect planets responsible for the disk morphology. In this paper, we study the F-type star HIP 67497 and present a first-…
An eccentric companion at the edge of the brown dwarf desert orbiting the 2.4 M⊙ giant star HIP 67537
Wittenmyer, R. A.; Jones, M. I.; Drass, H. +5 more
We report the discovery of a substellar companion around the giant star HIP 67537. Based on precision radial velocity measurements from CHIRON and FEROS high-resolution spectroscopic data, we derived the following orbital elements for HIP 67537 b: mb sin I = 11.1+0.4-1.1Mjup, a =4.9+0.14-…
A revised moving cluster distance to the Pleiades open cluster
Bouy, H.; Bouvier, J.; Teixeira, R. +3 more
Context. The distance to the Pleiades open cluster has been extensively debated in the literature over several decades. Although different methods point to a discrepancy in the trigonometric parallaxes produced by the HIPPARCOS mission, the number of individual stars with known distances is still small compared to the number of cluster members to …
The kinematic signature of the Galactic warp in Gaia DR1. I. The Hipparcos subsample
Lattanzi, M. G.; Drimmel, R.; Poggio, E. +2 more
Context. The mechanism responsible for the warp of our Galaxy, as well as its dynamical nature, continues to remain unknown. With the advent of high precision astrometry, new horizons have been opened for detecting the kinematics associated with the warp and for constraining possible warp formation scenarios for the Milky Way.
Aims: The aim o…
Impact of basic angle variations on the parallax zero point for a scanning astrometric satellite
van Leeuwen, Floor; Lindegren, Lennart; Hobbs, David +2 more
Context. Determination of absolute parallaxes by means of a scanning astrometric satellite such as Hipparcos or Gaia relies on the short-term stability of the so-called basic angle between the two viewing directions. Uncalibrated variations of the basic angle may produce systematic errors in the computed parallaxes.
Aims: We examine the coupl…
Calibration of the photometric G passband for Gaia Data Release 1
Maíz Apellániz, J.
Context. On September 2016 the first data from Gaia were released (DR1). The first release included photometry for over 109 sources in the very broad G system.
Aims: The aims here are to test the correspondence between G magnitudes in DR1 and the synthetic equivalents derived using spectral energy distributions from observed and mo…
The massive multiple system HD 64315
Montes, D.; Simón-Díaz, S.; Evans, C. J. +4 more
Context. The O6 Vn star HD 64315 is believed to belong to the star-forming region known as NGC 2467, but previous distance estimates do not support this association. Moreover, it has been identified as a spectroscopic binary, but existing data support contradictory values for its orbital period.
Aims: We explore the multiple nature of this st…