Search Publications
New 3D gas density maps of NaI and CaII interstellar absorption within 300 pc
Lallement, R.; Welsh, B. Y.; Vergely, J. -L. +1 more
Aims: We present new high resolution (R > 50 000) absorption measurements of the NaI doublet (5889-5895 Å) along 482 nearby sight-lines, in addition to 807 new measurements of the CaII K (3933 Å) absorption line. We have combined these new data with previously reported measurements to produce a catalog of absorptions towards a total of 185…
A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups
Eiroa, C.; Montesinos, B.; Montes, D. +2 more
Context. Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to author. Most members of these groups have been identified by means of kinematic criteria, …
Distance determination for RAVE stars using stellar models . II. Most likely values assuming a standard stellar evolution scenario
Gilmore, G.; Freeman, K. C.; Munari, U. +23 more
The RAdial Velocity Experiment (RAVE) is a spectroscopic survey of the Milky Way which already collected over 400 000 spectra of ~ 330 000 different stars. We use the subsample of spectra with spectroscopically determined values of stellar parameters to determine the distances to these stars. The list currently contains 235 064 high quality spectr…
Hip 63510C, Hip 73786B, and nine new isolated high proper motion T dwarf candidates from UKIDSS DR6 and SDSS DR7
Scholz, R. -D.
Aims: Completing the poorly known substellar census of the solar neighbourhood, especially with respect to the coolest brown dwarfs, will lead to a better understanding of failed star formation processes and binary statistics with different environmental conditions.
Methods: Using UKIDSS data and their cross-correlation with the SDSS, we…
Spatial distribution of interstellar dust in the Sun's vicinity. Comparison with neutral sodium-bearing gas
Lallement, R.; Vergely, J. -L.; Raimond, S. +1 more
Aims: 3D tomography of the interstellar dust and gas may be useful in many respects, from the physical and chemical evolution of the interstellar medium itself to foreground decontamination of the cosmic microwave background, or various studies of the environments of specific objects. However, while spectral data cubes of the galactic emissio…
Distance determination for RAVE stars using stellar models
Gilmore, G.; Freeman, K. C.; Munari, U. +21 more
Aims: We develop a method for deriving distances from spectroscopic data and obtaining full 6D phase-space coordinates for the RAVE survey's second data release.
Methods: We used stellar models combined with atmospheric properties from RAVE (effective temperature, surface gravity and metallicity) and (J-Ks) photometry from arc…
High-resolution imaging of Galactic massive stars with AstraLux. I. 138 fields with δ > - 25°
Maíz Apellániz, J.
Context. Massive stars have high-multiplicity fractions, and many of them have still undetected components, thus hampering the study of their properties.
Aims: I study a sample of massive stars with high angular resolution to better characterize their multiplicity.
Methods: I observed 138 fields that include at least one massive star wit…
Hipparcos preliminary astrometric masses for the two close-in companions to HD 131664 and HD 43848. A brown dwarf and a low-mass star
Sozzetti, A.; Desidera, S.
Context. Several mechanisms for forming brown dwarfs have been proposed, which today are not believed to be mutually exclusive. Among the fundamental characteristics of brown dwarfs that are intrinsically tied to their origins, multiplicity is particularly relevant. Any successful determination of the actual mass for such objects in any systems is…
AKARI's infrared view on nearby stars. Using AKARI infrared camera all-sky survey, 2MASS, and Hipparcos catalogs
Matsunaga, N.; Matsuhara, H.; Oyabu, S. +11 more
Context. The AKARI, a Japanese infrared space mission, has performed an All-Sky Survey in six infrared-bands from 9 to 180 µm with higher spatial resolutions and better sensitivities than IRAS.
Aims: We investigate the mid-infrared (9 and 18 µm) point source catalog (PSC) obtained with the infrared camera (IRC) onboard AKARI, in o…
VERA observations of SiO maser emission from R Aquarii
Bujarrabal, V.; Hirota, T.; Sato, K. +9 more
Aims: We aim to study the spatial distribution of the v=1 and v=2J = 1-0 SiO maser emission from R Aqr, a well known stellar symbiotic system. In particular, we intend to determine the annual parallax and proper motion of the source by means of measurements of the absolute coordinates of the maser spots.
Methods: We performed VLBI observ…