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The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
Antonio Marin-Franch, Antonio Aparicio, Giampaolo Piotto +13
The ACS Survey of Galactic Globular Clusters is a Hubble Space Telescope (HST) Treasury program designed to provide a new large, deep and homogeneous photometric database. Based on…
Our Nearest 15 Million Neighbors: The Field Low-Mass Stellar Luminosity and Mass Functions
John J. Bochanski, Suzanne L. Hawley, I. Neill Reid +4
We report on a new measurement of the luminosity function (LF) and mass function (MF) of field low-mass dwarfs using Sloan Digital Sky Survey (SDSS) photometry. The final catalog i…
The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk: I. The Calibration Region
Kevin R. Covey, Suzanne L. Hawley, John J. Bochanski +6
We present measurements of the luminosity and mass functions of low-mass stars constructed from a catalog of matched Sloan Digital Sky Survey (SDSS) and 2 Micron All Sky Survey (2M…
BD-22 5866: A Low-mass Quadruple-lined Spectroscopic AND Eclipsing Binary
Evgenya Shkolnik, Michael C. Liu, I. Neill Reid +4
We report our discovery of an extremely rare, low mass, quadruple-lined spectroscopic binary BD-22 5866 (=NLTT 53279, integrated spectral type = M0 V), found during an ongoing sear…
Spitzer-IRAC Search for Companions to Nearby, Young M Dwarfs
Peter R. Allen, I. Neill Reid
We present the results of a survey of nearby, young M stars for wide low-mass companions with IRAC on the Spitzer Space Telescope. We observed 40 young M dwarfs within 20 pc of the…
Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
Andrew A. West, Suzanne L. Hawley, John J. Bochanski +5
We present a spectroscopic analysis of over 38,000 low-mass stars from the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). Analysis of this unprecedentedly large sample confi…
The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
A. P. Milone, L. R. Bedin, G. Piotto +13
Photometry with HST's ACS reveals that the subgiant branch (SGB) of the globular cluster NGC 1851 splits into two well-defined branches. If the split is due only to an age effect,…
The ACS Survey of Galactic Globular Clusters: M54 and Young Populations in the Sagittarius Dwarf Spheroidal Galaxy
Michael H. Siegel, Aaron Dotter, Steven R. Majewski +11
We present new Hubble Space Telescope photometry of the massive globular cluster M54 (NGC 6715) and the superposed core of the tidally disrupted Sagittarius (Sgr) dSph galaxy as pa…
Searching for Earth analogues around the nearest stars: the disk age-metallicity relation and the age distribution in the Solar Neighbourhood
I. Neill Reid, Edwin L. Turner, Margaret C. Turnbull +2
The chemical composition of Earth's atmosphere has undergone substantial evolution over the course of its history. It is possible, even likely, that terrestrial planets in other pl…
The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
Ata Sarajedini, L. Bedin, B. Chaboyer +10
We present the first results of a large ACS Survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N > ~10…
A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries
Peter R. Allen, David W. Koerner, Michael W. McElwain +2
We present the results of a deep-imaging search for wide companions to low-mass stars and brown dwarfs using NSFCam on IRTF. We searched a sample of 132 M7-L8 dwarfs to magnitude l…
A Re-appraisal of the Habitability of Planets Around M Dwarf Stars
Jill C. Tarter, Peter R. Backus, Rocco L. Mancinelli +29
Stable, hydrogen-burning, M dwarf stars comprise about 75% of all stars in the Galaxy. They are extremely long-lived and because they are much smaller in mass than the Sun (between…
Discovery of 9 New Companions to Nearby Young M Stars with the Altair AO System
Sebastian Daemgen, Nick Siegler, I. Neill Reid +1
We present results of a high-resolution, near-infrared survey of 41 nearby, young (<~300 Myr) M0-M5.0 dwarfs using the Altair natural guide star adaptive optics system at the Gemin…
Using the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity
Andrew A. West, John J. Bochanski, Suzanne L. Hawley +5
We present a spectroscopic study and dynamical analysis of ~2600 M7 dwarfs. We confirm our previous finding that the fraction of magnetically active stars decreases with vertical d…
Extrasolar Planets: A Galactic Perspective
I. N. Reid
The host stars of extrasolar planets tend to be metal-rich. We have examined the data for these stars for evidence of trends in other galactic parameters, without success. However,…
A search for binary systems among the nearest L dwarfs
I. N. Reid, E. Lewitus, P. R. Allen +2
We have used the NICMOS NIC1 camera on the Hubble Space Telescope to obtain high angular resolution images of 51 ultracool dwarfs in the immediate Solar Neighbourhood. Nine systems…
Not Alone: Tracing the Origins of Very Low Mass Stars and Brown Dwarfs Through Multiplicity Studies
Adam J. Burgasser, I. Neill Reid, Nick Siegler +4
The properties of multiple stellar systems have long provided important empirical constraints for star formation theories, enabling (along with several other lines of evidence) a c…
The Radio Spectrum of TVLM513-46546: Constraints on the Coronal Properties of a Late M Dwarf
Rachel A. Osten, Suzanne L. Hawley, Timothy S. Bastian +1
We explore the radio emission from the M9 dwarf, TVLM513-46546, at multiple radio frequencies, determining the flux spectrum of persistent radio emission, as well as constraining t…
Rotation velocities of white dwarfs determined from the CaII K line
L. Berger, D. Koester, R. Napiwotzki +2
We determine projected rotation velocities v sini in DAZ white dwarfs, for the first time using the rotational broadening of the CaII K line. The results confirm previous findings…
The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-ray, and H-alpha Observations
E. Berger, R. E. Rutledge, I. N. Reid +12
We present the first simultaneous, multi-wavelength observations of an L dwarf, the L3.5 candidate brown dwarf 2MASS J00361617+1821104, conducted with the Very Large Array, the Cha…
Discovery of Two Very Low-Mass Binaries: Final Results of an Adaptive Optics Survey of Nearby M6.0-M7.5 Stars
Nick Siegler, Laird M. Close, Kelle L. Cruz +2
We present updated results of a high-resolution, magnitude limited (Ks<12 mag) imaging survey of nearby low-mass M6.0-M7.5 field stars. The observations were carried out using adap…
Meeting the Cool Neighbors VIII: A preliminary 20-parsec census from the NLTT catalogue
I. N. Reid, K. L. Cruz, P. R. Allen +8
Continuing our census of late-type dwarfs in the Solar Neighbourhood, we present BVRI photometry and optical spectroscopy of 800 mid-type M dwarfs drawn from the NLTT proper motion…
2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary
Kelle L. Cruz, Adam J. Burgasser, I. Neill Reid +1
We present the peculiar near-infrared spectrum of the newly discovered brown dwarf 2MASS J05185995-2828372, identified in the Two Micron All-Sky Survey. Features characteristic of…
Star Clusters in the Galactic Anticenter Stellar Structure and the Origin of Outer Old Open Clusters
Peter M. Frinchaboy, Steven R. Majewski, Jeffrey D. Crane +5
The Galactic Anticenter Stellar Structure (GASS) has been identified with excess surface densities of field stars in several large area sky surveys, and with an unusual, string-lik…