Wide companions to M and L subdwarfs Virtual Observatory Resource

Authors
  1. Gonzalez-Payo J.
  2. Cortes-Contreras M.
  3. Lodieu N.
  4. Solano E.
  5. Zhang Z.H.,Galvez-Ortiz M.-C.
  6. Published by
    CDS
Abstract

The aim of the project is to identify wide common proper motion companions to a sample of spectroscopically confirmed M and L metal-poor dwarfs (also known as subdwarfs) to investigate the impact of metallicity on the binary fraction of low-mass metal-poor binaries and to improve the determination of their metallicity from the higher-mass binary. We made use of Virtual Observatory tools and large-scale public surveys to look in Gaia for common proper motion companions to a well-defined sample of ultracool subdwarfs with spectral types later than M5 and metallicities below or equal to ~0.5dex. We collected low-resolution optical spectroscopy for our best system, which is a binary composed of one sdM1.5 subdwarf and one sdM5.5 subdwarf located at ~1360au, and for another two likely systems separated by more than 115000au. We confirm one wide companion to an M subdwarf, and infer a multiplicity for M subdwarfs (sdMs) of 1.0_-1.0_^+2.0^% for projected physical separations of up to 743000au. We also find four M-L systems, three of which are new detections. No colder companion was identified in any of the 219 M and L subdwarfs of the sample, mainly because of limitations on the detection of faint sources with Gaia. We infer a frequency of wide systems for sdM5-9.5 of 0.60_-0.60_^+1.17^% for projected physical separations larger than 1360au (up to 142400au). This study shows a multiplicity rate of 1.0_-1.0_^+2.0^% in sdMs, and 1.9_-1.9_^+3.7^% in extreme M subdwarfs. We did not find any companion for the ultra M subdwarfs of our sample, establishing an upper limit of 5.3% on binarity for these objects.

Keywords
  1. Multiple stars
  2. Subdwarf stars
Bibliographic source Bibcode
2021A&A...650A.190G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/650/A190
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/650/A190
Document Object Identifer DOI
doi:10.26093/cds/vizier.36500190

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/650/A190
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/650/A190
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/650/A190
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/650/A190/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/650/A190/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/650/A190/tablea1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/650/A190/tablea3?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/650/A190/tablea3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/650/A190/tablea3?

History

2021-06-29T08:08:01Z
Resource record created
2021-06-29T08:08:01Z
Created
2023-05-05T11:20:12Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr