skip to main content

SciTech ConnectSciTech Connect

Title: ORBITAL MONITORING OF THE ASTRALUX LARGE M-DWARF MULTIPLICITY SAMPLE

Orbital monitoring of M-type binaries is essential for constraining their fundamental properties. This is particularly useful in young systems, where the extended pre-main-sequence evolution can allow for precise isochronal dating. Here, we present the continued astrometric monitoring of the more than 200 binaries of the AstraLux Large Multiplicity Survey, building both on our previous work, archival data, and new astrometric data spanning the range of 2010-2012. The sample is very young overall—all included stars have known X-ray emission, and a significant fraction (18%) of them have recently also been identified as members of young moving groups in the solar neighborhood. We identify ∼30 targets that both have indications of being young and for which an orbit either has been closed or appears possible to close in a reasonable time frame (a few years to a few decades). One of these cases, GJ 4326, is, however, identified as probably being substantially older than has been implied from its apparent moving group membership, based on astrometric and isochronal arguments. With further astrometric monitoring, these targets will provide a set of empirical isochrones, against which theoretical isochrones can be calibrated, and which can be used to evaluate the precise ages of nearby youngmore » moving groups.« less
Authors:
 [1] ; ; ; ; ; ; ;  [2] ;  [3]
  1. Stockholm University, Stockholm (Sweden)
  2. Max Planck Institute for Astronomy, Heidelberg (Germany)
  3. UJF-Grenoble, CNRS-INSU, IPAG, Grenoble (France)
Publication Date:
OSTI Identifier:
22340156
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 214; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AGE ESTIMATION; DWARF STARS; EMISSION; MATHEMATICAL EVOLUTION; MONITORING; MULTIPLICITY; ORBITS; SPATIAL RESOLUTION; X RADIATION