Search Publications
A Survey of Stellar Families: Multiplicity of Solar-type Stars
Gies, Douglas R.; Latham, David W.; Marcy, Geoffrey W. +6 more
We present the results of a comprehensive assessment of companions to solar-type stars. A sample of 454 stars, including the Sun, was selected from the Hipparcos catalog with π>40 mas, σπ/π < 0.05, 0.5 <= B - V <= 1.0 (~F6-K3), and constrained by absolute magnitude and color to exclude evolved stars. These criteria are equiv…
The Third US Naval Observatory CCD Astrograph Catalog (UCAC3)
Zacharias, N.; Girard, T.; Makarov, V. +27 more
The third US Naval Observatory (USNO) CCD Astrograph Catalog, UCAC3, was released at the IAU General Assembly on 2009 August 10. It is the first all-sky release in this series and contains just over 100 million objects, about 95 million of them with proper motions, covering about R = 8-16 mag. Current epoch positions are obtained from the observat…
The Milky Way Tomography with SDSS. III. Stellar Kinematics
Brewington, Howard; Schneider, Donald P.; Majewski, Steven R. +54 more
We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r < 20 and proper-motion measurements derived from Sloan Digital Sky Survey (SDSS) and POSS astrometry, including ~170,000 stars with radial-velocity measurements from the SDSS spectroscopic survey. Distances to stars are determined using a photometric-paralla…
UBV(RI)C JHK observations of Hipparcos-selected nearby stars
Kilkenny, D.; Marang, F.; Koen, C. +1 more
We present homogeneous, standardized UBV(RI)C photometry for over 700 nearby stars selected on the basis of Hipparcos parallaxes. Additionally, we list JHK photometry for about half of these stars, as well as L photometry for 86 of the brightest. A number of stars with peculiar colours or anomalous locations in various colour-magnitude …
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, …
Masses and luminosities of O- and B-type stars and red supergiants
Neuhäuser, R.; Hohle, M. M.; Schutz, B. F.
Massive stars are of interest as progenitors of supernovae, i.e. neutron stars and black holes, which can be sources of gravitational waves. Recent population synthesis models can predict neutron star and gravitational wave observations but deal with a fixed supernova rate or an assumed initial mass function for the population of massive stars. He…
Low-velocity streams in the solar neighbourhood caused by the Galactic bar
Siebert, A.; Minchev, I.; Bienayme, O. +1 more
We find that a steady-state bar induces transient features at low velocities in the solar neighbourhood velocity distribution due to the initial response of the disc, following the formation of the bar. We associate these velocity streams with two quasi-periodic orbital families, librating around the stable x1(1) and x1(2) or…
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…
The PL calibration for Milky Way Cepheids and its implications for the distance scale
Turner, David G.
The rationale behind recent calibrations of the Cepheid PL relation using the Wesenheit formulation is reviewed and reanalyzed, and it is shown that recent conclusions regarding a possible change in slope of the PL relation for short-period and long-period Cepheids are tied to a pathological distribution of HST calibrators within the instability s…