scholarly journals MOTION VERIFIED RED STARS (MoVeRS): A CATALOG OF PROPER MOTION SELECTED LOW-MASS STARS FROMWISE, SDSS, AND 2MASS

2016 ◽  
Vol 151 (2) ◽  
pp. 41 ◽  
Author(s):  
Christopher A. Theissen ◽  
Andrew A. West ◽  
Saurav Dhital
Keyword(s):  
Proper Motion ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals The B-Star Exoplanet Abundance Study: a co-moving 16–25 MJup companion to the young binary system HIP 79098

2019 ◽  
Vol 626 ◽  
pp. A99 ◽  
Author(s):  
Markus Janson ◽  
Ruben Asensio-Torres ◽  
Damien André ◽  
Mickaël Bonnefoy ◽  
Philippe Delorme ◽  
...  
Keyword(s):  
Proper Motion ◽  
Massive Stars ◽  
Brown Dwarfs ◽  
Mass Ratio ◽  
Low Mass Stars ◽  
Spectroscopic Binary ◽  
Bona Fide ◽  
Low Mass ◽  
Substellar Companions ◽  
Dependent Mass

Wide low-mass substellar companions are known to be very rare among low-mass stars, but appear to become increasingly common with increasing stellar mass. However, B-type stars, which are the most massive stars within ~150 pc of the Sun, have not yet been examined to the same extent as AFGKM-type stars in that regard. In order to address this issue, we launched the ongoing B-star Exoplanet Abundance Study (BEAST) to examine the frequency and properties of planets, brown dwarfs, and disks around B-type stars in the Scorpius-Centaurus (Sco-Cen) association; we also analyzed archival data of B-type stars in Sco-Cen. During this process, we identified a candidate substellar companion to the B9-type spectroscopic binary HIP 79098 AB, which we refer to as HIP 79098 (AB)b. The candidate had been previously reported in the literature, but was classified as a background contaminant on the basis of its peculiar colors. Here we demonstrate that the colors of HIP 79098 (AB)b are consistent with several recently discovered young and low-mass brown dwarfs, including other companions to stars in Sco-Cen. Furthermore, we show unambiguous common proper motion over a 15-yr baseline, robustly identifying HIP 79098 (AB)b as a bona fide substellar circumbinary companion at a 345 ± 6 AU projected separation to the B9-type stellar pair. With a model-dependent mass of 16–25 MJup yielding a mass ratio of <1%, HIP 79098 (AB)b joins a growing number of substellar companions with planet-like mass ratios around massive stars. Our observations underline the importance of common proper motion analysis in the identification of physical companionship, and imply that additional companions could potentially remain hidden in the archives of purely photometric surveys.

scholarly journals Proper motion of very low mass stars and brown dwarfs in the Pleiades cluster

2001 ◽  
Vol 367 (1) ◽  
pp. 211-217 ◽  
Author(s):  
E. Moraux ◽  
J. Bouvier ◽  
J. R. Stauffer
Keyword(s):  
Proper Motion ◽  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals A survey for low-mass stellar and substellar members of the Hyades open cluster

2018 ◽  
Vol 611 ◽  
pp. A34 ◽  
Author(s):  
Stanislav Melnikov ◽  
Jochen Eislöffel
Keyword(s):  
Proper Motion ◽  
Open Cluster ◽  
Dynamical Evolution ◽  
Mass Function ◽  
Open Clusters ◽  
Cluster Member ◽  
Low Mass Stars ◽  
Hyades Cluster ◽  
Low Mass ◽  
Selection Of

Context. Unlike young open clusters (with ages < 250 Myr), the Hyades cluster (age ~ 600 Myr) has a clear deficit of very low-mass stars (VLM) and brown dwarfs (BD). Since this open cluster has a low stellar density and covers several tens of square degrees on the sky, extended surveys are required to improve the statistics of the VLM/BD objects in the cluster. Aim. We search for new VLM stars and BD candidates in the Hyades cluster to improve the present-day cluster mass function down to substellar masses. Methods. An imaging survey of the Hyades with a completeness limit of 21.m5 in the R band and 20.m5 in the I band was carried out with the 2k × 2k CCD Schmidt camera at the 2 m Alfred Jensch Telescope in Tautenburg. We performed a photometric selection of the cluster member candidates by combining results of our survey with 2MASS JHKs photometry Results. We present a photometric and proper motion survey covering 23.4 deg2 in the Hyades cluster core region. Using optical/IR colour-magnitude diagrams, we identify 66 photometric cluster member candidates in the magnitude range 14.m7 < I < 20.m5. The proper motion measurements are based on several all-sky surveys with an epoch difference of 60–70 yr for the bright objects. The proper motions allowed us to discriminate the cluster members from field objects and resulted in 14 proper motion members of the Hyades. We rediscover Hy 6 as a proper motion member and classify it as a substellar object candidate (BD) based on the comparison of the observed colour-magnitude diagram with theoretical model isochrones. Conclusions. With our results, the mass function of the Hyades continues to be shallow below ~0.15 M⊙ indicating that the Hyades have probably lost their lowest mass members by means of dynamical evolution. We conclude that the Hyades core represents the “VLM/BD desert” and that most of the substeller objects may have already left the volume of the cluster.

A deep proper motion survey of the Pleiades for low-mass stars and brown dwarfs

1991 ◽  
Vol 253 (1) ◽  
pp. 1-8 ◽  
Author(s):  
N. C. Hambly ◽  
M. R. S. Hawkins ◽  
R. F. Jameson
Keyword(s):  
Proper Motion ◽  
Brown Dwarfs ◽  
Low Mass Stars ◽  
Low Mass

scholarly journals A Southern Sky Survey of Low Mass Stars and Brown Dwarfs

1995 ◽  
Vol 148 ◽  
pp. 296-300
Author(s):  
Andrew D. Thackrah ◽  
Michael R. S. Hawkins
Keyword(s):  
Proper Motion ◽  
Photometric Data ◽  
Brown Dwarf ◽  
Low Mass Stars ◽  
Sky Survey ◽  
Form Part ◽  
Low Mass ◽  
Measuring Machine ◽  
Motion Measurements ◽  
The Uk

AbstractWe are conducting a survey of the southern sky to study the properties of the lowest mass stars and the sub-stellar brown dwarf population thought to exist at masses below 0.08 M⊙. The survey makes use of plates from the UK and ESO Schmidt telescopes, using the new SuperCOSMOS plate measuring machine at Edinburgh to provide a catalogue of photographic BRI colours and proper motion measurements. Candidates are selected by extreme R–I colour (> 2.5) to a plate-limited magnitude of I ≈ 19.0 and R ≈ 21.0. The size of the survey is only limited by the progress of the UK Schmidt I band survey and the availability of photometric data for calibration of SuperCOSMOS measurements. It is anticipated that the survey will form part of a multi-colour proper motion database of southern sky objects.

scholarly journals The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper Motion Verified Low-mass Stars and Brown Dwarfs from SDSS, 2MASS, andWISE

2017 ◽  
Vol 153 (3) ◽  
pp. 92 ◽  
Author(s):  
Christopher A. Theissen ◽  
Andrew A. West ◽  
Guillaume Shippee ◽  
Adam J. Burgasser ◽  
Sarah J. Schmidt
Keyword(s):  
Proper Motion ◽  
Brown Dwarfs ◽  
Late Type ◽  
Low Mass Stars ◽  
Low Mass ◽  
Late Movers

scholarly journals Ages of Galactic and Extragalactic Star Clusters of Various Abundances

1983 ◽  
Vol 6 ◽  
pp. 109-117 ◽  
Author(s):  
R.D. Cannon
Keyword(s):  
Star Clusters ◽  
Magellanic Clouds ◽  
Open Clusters ◽  
Simultaneous Solution ◽  
Low Mass Stars ◽  
Cluster Systems ◽  
Distant Cluster ◽  
Low Mass

In this review I shall concentrate mainly on globular star clusters in our Galaxy since these are the objects for which most work has been done recently, both observationally and theoretically. However, I shall also discuss briefly the oldest open clusters and clusters in the Magellanic Clouds. Little can be said about more distant cluster systems, since the only observations available are of integrated colours or spectra and these seem to be rather unreliable indicators of age. It is perhaps worth pointing out that the title may be slightly misleading; the problem is not so much to determine the ages of clusters of known abundances, as to obtain the best simultaneous solution for both age and composition, since some of the most important abundances (notably helium and oxygen) are virtually unobservable in little-evolved low mass stars.

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