Search Publications
A 2.4% Determination of the Local Value of the Hubble Constant
Casertano, Stefano; Filippenko, Alexei V.; Foley, Ryan J. +12 more
We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%. The bulk of this improvement comes from new near-infrared (NIR) observations of Cepheid variables in 11 host galaxies of recent type Ia supernovae (SNe Ia), more than doubling the sample o…
Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars
Valenti, Jeff A.; Fischer, Debra A.; Brewer, John M. +1 more
We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective…
Eclipsing Binaries as Benchmarks for Trigonometric Parallaxes in the Gaia Era
Torres, Guillermo; Stassun, Keivan G.
We present fits to the broadband photometric spectral energy distributions (SEDs) of 158 eclipsing binaries (EBs) in the Tycho-2 catalog. These EBs were selected because they have highly precise stellar radii, effective temperatures, and in many cases metallicities previously determined in the literature, and thus have bolometric luminosities that…
Spectro-photometric distances to stars: A general purpose Bayesian approach
Schneider, Donald P.; Steinmetz, Matthias; Girardi, Léo +16 more
Context. Determining distances to individual field stars is a necessary step towards mapping Galactic structure and determining spatial variations in the chemo-dynamical properties of stellar populations in the Milky Way.
Aims: In order to provide stellar distance estimates for various spectroscopic surveys, we have developed a code that esti…
A Comprehensive Census of Nearby Infrared Excess Stars
Song, Inseok; Cotten, Tara H.
The conclusion of the Wide-Field Infrared Survey Explorer (WISE) mission presents an opportune time to summarize the history of using excess emission in the infrared as a tracer of circumstellar material and exploit all available data for future missions such as the James Webb Space Telescope. We have compiled a catalog of infrared excess stars fr…
A package for the automated classification of periodic variable stars
Bailer-Jones, Coryn A. L.; Kim, Dae-Won
We present a machine learning package for the classification of periodic variable stars. Our package is intended to be general: it can classify any single band optical light curve comprising at least a few tens of observations covering durations from weeks to years with arbitrary time sampling. We use light curves of periodic variable stars taken …
Catalog of equatorial coordinates and B-magnitudes of stars of the FON project
Andruk, V. M.; Pakuliak, L. K.; Golovnia, V. V. +4 more
The catalog of equatorial coordinates α and δ and B-magnitudes of stars of the northern sky (from–4° to +90°) was created as a part of the FON project at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. The data accumulated in the Joint Digital Archive of the Ukrainian Virtual Observatory were used. The total numbe…
Determining Ages of APOGEE Giants with Known Distances
Bovy, Jo; Majewski, Steven R.; Feuillet, Diane K. +4 more
We present a sample of 705 local giant stars observed using the New Mexico State University 1 m telescope with the Sloan Digital Sky Survey-III/Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectrograph, for which we estimate stellar ages and the local star formation history (SFH). The high-resolution (R ∼ 22,500), near infrared …
Catalog of positions and B-magnitudes of stars in the circumpolar region of the Northern Sky Survey (FON) project
Andruk, V. M.; Pakuliak, L. K.; Golovnia, V. V. +4 more
The catalog of equatorial coordinates α and δ and B-magnitudes of stars has been created at the Main Astronomical Observatory, National Academy of Sciences of Ukraine (MAO NASU), for the circumpolar region (from 58° to 90°) of the Northern Sky Survey (FON) project within the work on the rational use of resources accumulated in the JDA (Joint Digit…
Parallax and masses of α Centauri revisited
Boffin, Henri M. J.; Pourbaix, Dimitri
Context. Despite the thorough work of van Leeuwen, the parallax of α Centauri is still far from being carved in stone. Any derivation of the individual masses is therefore uncertain, if not questionable. And yet, that does not prevent this system from being used for calibration purpose in several studies.
Aims: We aim for more accurate model-…