Search Publications
An All-sky Catalog of Bright M Dwarfs
Gaidos, Eric; Lépine, Sébastien
We present an all-sky catalog of M dwarf stars with apparent infrared magnitude J < 10. The 8889 stars are selected from the ongoing SUPERBLINK survey of stars with proper motion µ > 40 mas yr-1, supplemented on the bright end with the Tycho-2 catalog. Completeness tests which account for kinematic (proper motion) bias sugge…
A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun
Neuhäuser, R.; Hohle, M. M.; Tetzlaff, N.
Traditionally, runaway stars are O- and B-type stars with large peculiar velocities. We would like to extend this definition to young stars (up to ≈50 Myr) of any spectral type and to identify those present in the Hipparcos catalogue by applying different selection criteria, such as peculiar space velocities or peculiar one-dimensional velocities.…
Search for brown-dwarf companions of stars
Zucker, S.; Queloz, D.; Sahlmann, J. +7 more
Context. The frequency of brown-dwarf companions in close orbit around Sun-like stars is low compared to the frequency of planetary and stellar companions. There is presently no comprehensive explanation of this lack of brown-dwarf companions.
Aims: By combining the orbital solutions obtained from stellar radial-velocity curves and Hipparcos …
Random forest automated supervised classification of Hipparcos periodic variable stars
Rimoldini, L.; Mowlavi, N.; Nienartowicz, K. +14 more
We present an evaluation of the performance of an automated classification of the Hipparcos periodic variable stars into 26 types. The sub-sample with the most reliable variability types available in the literature is used to train supervised algorithms to characterize the type dependencies on a number of attributes. The most useful attributes eva…
The Southern Proper Motion Program. IV. The SPM4 Catalog
Beers, Timothy C.; Lee, Young Sun; Casetti-Dinescu, Dana I. +8 more
We present the fourth installment of the Yale/San Juan Southern Proper Motion Catalog, SPM4. The SPM4 contains absolute proper motions, celestial coordinates, and B, V photometry for over 103 million stars and galaxies between the south celestial pole and -20° declination. The catalog is roughly complete to V = 17.5 and is based on photographic an…
Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue
Olling, Rob P.; Shaya, Ed J.
We develop Bayesian statistical methods for discovering and assigning probabilities to non-random (e.g., physical) stellar companions. These companions are either presently bound or were previously bound. The probabilities depend on similarities in corrected proper motion parallel and perpendicular to the brighter component's motion, parallax, and…
A Magellan MIKE and Spitzer MIPS Study of 1.5-1.0 M sun Stars in Scorpius-Centaurus
Weinberger, Alycia J.; Chen, Christine H.; Mamajek, Eric E. +3 more
We obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 µm and 70 µm observations of 182 nearby, Hipparcos F- and G-type common proper motion single and binary systems in the nearest OB association, Scorpius-Centaurus. We also obtained Magellan/MIKE R ~ 50,000 visual spectra at 3500-10500 Å for 181 candid…
Bayesian inference of stellar parameters and interstellar extinction using parallaxes and multiband photometry
Bailer-Jones, C. A. L.
Astrometric surveys provide the opportunity to measure the absolute magnitudes of large numbers of stars, but only if the individual line-of-sight extinctions are known. Unfortunately, extinction is highly degenerate with stellar effective temperature when estimated from broad-band optical/infrared photometry. To address this problem, I introduce …
Multidimensional Bayesian membership analysis of the Sco OB2 moving group
Ireland, M. J.; Rizzuto, A. C.; Robertson, J. G.
We present a new high-mass membership of the nearby Sco OB2 association based on Hipparcos positions, proper motions and parallaxes, and radial velocities taken from the 2nd Catalogue of Radial Velocities with Astrometric Data (CRVAD-2). The Bayesian membership selection method developed makes no distinction between subgroups of Sco OB2 and utiliz…
Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June
Howell, Steve B.; Ciardi, David R.; Horch, Elliott P. +4 more
The results of 497 speckle observations of Hipparcos stars and selected other targets are presented. Of these, 367 were resolved into components and 130 were unresolved. The data were obtained using the Differential Speckle Survey Instrument at the WIYN 3.5 m Telescope. (The WIYN Observatory is a joint facility of the University of Wisconsin-Madis…