Classifying Luyten Stars Using An Optical-Infrared Reduced Proper Motion Diagram

Abstract

We present a V-J reduced proper motion (RPM) diagram for stars in the New Luyten Two-Tenths (NLTT) catalog. In sharp contrast to the RPM diagram based on the original NLTT data, this optical-infrared RPM diagram shows distinct tracks for white dwarfs, subdwarfs, and main-sequence stars. It thereby permits the identification of white-dwarf and subdwarf candidates that have a high probability of being genuine.

Accepted ApJL version. 3 figures (2 in color). Table of candidate new WDs closer than 20 pc is now included

References in corpus (4)

• A Determination of the Local Density of White Dwarf Stars
• Meeting the Cool Neighbours I: Nearby stars in the NLTT Catalogue - Defining the sample
• Discovery of a Magnetic DZ White Dwarf with Zeeman-Split Lines of Heavy Elements
• Search for nearby stars among proper motion stars selected by optical-to-infrared photometry. I. Discovery of LHS 2090 at spectroscopic distance of d=6pc

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• Disk and Halo Wide Binaries from the Revised Luyten Catalog: Probes of Star Formation and MACHO Dark Matter
• Spectroscopic Identification of Cool White Dwarfs in the Solar Neighbourhood
• Nearby stars from the LSPM-north Proper Motion Catalog. I. Main Sequence Dwarfs and Giants Within 33 Parsecs of the Sun
• An Infrared High Proper Motion Survey Using 2MASS and SDSS: Discovery of M, L and T Dwarfs
• New Neighbors: Parallaxes of 18 nearby stars selected from the LSPM-north catalog
• Discovery of the Coolest Extreme Subdwarf
• New High Proper Motion Stars from the Digitized Sky Survey. II. Northern Stars with 0.5<mu<2.0 arcsec/yr at High Galactic Latitudes
• The white dwarf luminosity function
• New High Proper Motion Stars from the Digitized Sky Survey. III. Stars with proper motions 0.45<mu<2.0''/yr south of Decl.=-30
• LSR0602+3910 - Discovery of a Bright Nearby L-type Brown Dwarf
• New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools: Part I: UKIDSS LAS DR5 vs SDSS DR7
• A new extremely low-mass white dwarf in the NLTT catalogue
• The cool magnetic DAZ white dwarf NLTT 10480
• New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools: II. SDSS DR7 vs UKIDSS LAS DR6, SDSS DR7 vs UKIDSS LAS DR8, SDSS DR9 vs UKIDSS LAS DR10, and SDSS DR7 vs 2MASS
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• Completeness of USNO-B for High Proper-Motion Stars
• Multiplicity of the Galactic Senior Citizens: A high-resolution search for cool subdwarf companions
• Meeting the Cool Neighbours, VI: A search for nearby ultracool dwarfs in the Galactic Plane
• A New Merging Double Degenerate Binary in the Solar Neighborhood
• Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
• Deep Astrometric Standards (DAS) and Galactic Structure
• M Subdwarf Research. II. Atmospheric Parameters and Kinematics
• A search for new hot subdwarf stars by means of Virtual Observatory tools
• Stars in the USNO-B1 Catalog with Proper Motions Between 1.0 and 5.0 arcseconds per year
• Finding Extreme Subdwarfs
• SSSPM J1549$-$3544 Is Not a White Dwarf
• Proper Motions of Faint UV-Bright Sources in the Sandage Two-color Survey of the Galactic Plane
• Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud
• Catalogs of Wide Binaries and their Impact on Galactic Astronomy