Change search
ReferencesLink to record
Permanent link

Direct link
Stockholm University, Faculty of Science, Department of Astronomy. Max Planck Institute for Astronomy, Germany; Queen's University Belfast, United Kingdom .
Show others and affiliations
2014 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 214, no 2, 17- p.Article in journal (Refereed) Published
Abstract [en]

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 similar to 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 young moving groups.

Place, publisher, year, edition, pages
2014. Vol. 214, no 2, 17- p.
Keyword [en]
binaries: general, stars: late-type, techniques: high angular resolution
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-110203DOI: 10.1088/0067-0049/214/2/17ISI: 000344141500003OAI: diva2:769946


Available from: 2014-12-09 Created: 2014-12-08 Last updated: 2014-12-09Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Janson, Markus
By organisation
Department of Astronomy
In the same journal
Astrophysical Journal Supplement Series
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 18 hits
ReferencesLink to record
Permanent link

Direct link