A kinematically unbiased, all-sky search for nearby, young, low-mass stars
arXiv:1910.10463 · doi:10.1093/mnras/stz3019
Abstract
The past two decades have seen dramatic progress in our knowledge of the population of young stars of age Myr that lie within pc of the Sun. These nearby, young stars, most of which are found in loose, comoving groups, provide the opportunity to explore (among many other things) the dissolution of stellar clusters and their diffusion into the field star population. Here, we exploit the combination of astrometric and photometric data from {\it Gaia} and photometric data from GALEX (UV) and 2MASS (near-IR) in an attempt to identify additional nearby, young, late-type stars. Specifically, we present a sample of 146 GALEX UV-selected late-type (predominantly K-type) field stars with {\it Gaia}-based distances pc (based on {\it Gaia} Data Release 1) that have isochronal ages Myr even if equal-components binaries. We investigate the spectroscopic and kinematic properties of this sample. Despite their young isochronal ages, only per cent) of stars among this sample can be confidently associated with established nearby, young moving groups (MGs). These candidate MG members include 5 stars newly identified in this study. The vast majority of our sample of 146 nearby young star candidates have anomalous kinematics relative to the known MGs. These stars may hence represent a previously unrecognised population of young stars that has recently mixed into the older field star population. We discuss the implications and caveats of such a hypothesis---including the intriguing fact that, in addition to their non-young-star-like kinematics, the majority of the UV-selected, isochronally young field stars within pc appear surprisingly X-ray faint.
Accepted for publication in MNRAS, 21 pages, 12 figures
References in corpus (33)
- Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- Astrophysics Source Code Library
- The Radial Velocity Experiment (RAVE): Fifth Data Release
- Second ROSAT all-sky survey (2RXS) source catalogue
- On the age of the Pictoris moving group
- Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
- Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
- Planets Around Low-Mass Stars (PALMS). IV. The Outer Architecture of M Dwarf Planetary Systems
- The Solar Neighborhood XLV. The Stellar Multiplicity Rate of M Dwarfs Within 25 pc
- CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
- High-Dispersion Optical Spectra of Nearby Stars Younger Than The Sun
- Lithium Depletion of Nearby Young Stellar Associations
- The evolution of surface magnetic fields in young solar-type stars II: The early main sequence (250-650 Myr)
- A VLBI Resolution of the Pleiades Distance Controversy
- BANYAN. IV. Fundamental parameters of low-mass star candidates in nearby young stellar kinematic groups - Isochronal Age determination using Magnetic evolutionary models
- WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
- The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits: II- Survey description, results and performances
- Pre-main sequence spectroscopic binaries suitable for VLTI observations
- On the kinematic evolution of young local associations and the Sco-Cen complex
- LACEwING: A New Moving Group Analysis Code
- The rotation - Lithium depletion correlation in the beta Pictoris association and LDB age determination
- Search for associations containing young stars (SACY). V. Is multiplicity universal? Tight multiple systems
- A Measurement of Radius Inflation in the Pleiades and its Relation to Rotation and Lithium Depletion
- ACRONYM III: Radial Velocities for 336 Candidate Young Low-Mass Stars in the Solar Neighborhood, Including 78 Newly Confirmed Young Moving Group Members
- The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-Rich Stars in the Solar Neighborhood
- Using rotation, magnetic activity and lithium to estimate the ages of low mass stars
- EF Cha: Warm Dust Orbiting a Nearby 10 Myr Old Star
- The Near-Ultraviolet Luminosity Function of Young, Early M-Type Dwarf Stars
- Chromospherically Active Stars in the RAVE Survey. II. Young dwarfs in the Solar neighborhood
- Resolved Millimeter Emission from the HD 15115 Debris Disk
- Nearby Young, Active, Late-type Dwarfs in Gaia's First Data Release
- Searching for new young stars in the northern hemisphere: The Pisces Moving Group