The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples

R. J. De Rosa, Jennifer Patience, A. Vigan, P. A. Wilson, A. Schneider, N. J. Mcconnell, S. J. Wiktorowicz, C. Marois, I. Song, B. Macintosh, J. R. Graham, M. S. Bessell, R. Doyon, O. Lai

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100 au, 13 of which have sufficient historical measurements to allow for refinement of their orbital elements. For each system with an estimated orbit, the dynamical system mass obtained was compared with the system mass estimated from mass-magnitude relations. Discrepancies between the dynamical and theoretical system mass can be explained by the presence of a previously unresolved spectroscopic component or by a non-solar metallicity of the system. Using this approach to infer the presence of additional companions, a lower limit to the fraction of binaries, triples and quadruples can be estimated as 39, 46 and 15per cent for systems with at least one companion within 100 au. The fraction of multiple systems with three or more components shows a relative increase compared to the fraction for solar-type primaries resolved in previous volume-limited surveys. The observations have also revealed a pair of potentially young (<100Myr) M dwarf companions, which would make an ideal benchmark for the theoretical models during the pre-main-sequence contraction phase for M dwarfs. In addition to those systems with orbit fits, we report 13 systems for which further orbital monitoring observations are required, 11 of which are newly resolved as a part of the VAST survey.

Original languageEnglish (US)
Pages (from-to)2765-2785
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume422
Issue number4
DOIs
StatePublished - Jun 2012
Externally publishedYes

Fingerprint

A stars
orbits
stars
monitoring
dynamical systems
orbital elements
adaptive optics
contraction
metallicity
orbitals

Keywords

  • Binaries: close
  • Binaries: general
  • Techniques: high angular resolution

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples. / De Rosa, R. J.; Patience, Jennifer; Vigan, A.; Wilson, P. A.; Schneider, A.; Mcconnell, N. J.; Wiktorowicz, S. J.; Marois, C.; Song, I.; Macintosh, B.; Graham, J. R.; Bessell, M. S.; Doyon, R.; Lai, O.

In: Monthly Notices of the Royal Astronomical Society, Vol. 422, No. 4, 06.2012, p. 2765-2785.

Research output: Contribution to journalArticle

De Rosa, RJ, Patience, J, Vigan, A, Wilson, PA, Schneider, A, Mcconnell, NJ, Wiktorowicz, SJ, Marois, C, Song, I, Macintosh, B, Graham, JR, Bessell, MS, Doyon, R & Lai, O 2012, 'The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples', Monthly Notices of the Royal Astronomical Society, vol. 422, no. 4, pp. 2765-2785. https://doi.org/10.1111/j.1365-2966.2011.20397.x
De Rosa, R. J. ; Patience, Jennifer ; Vigan, A. ; Wilson, P. A. ; Schneider, A. ; Mcconnell, N. J. ; Wiktorowicz, S. J. ; Marois, C. ; Song, I. ; Macintosh, B. ; Graham, J. R. ; Bessell, M. S. ; Doyon, R. ; Lai, O. / The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 422, No. 4. pp. 2765-2785.
@article{d6d51fbaa4b24d079e3face855ed2e03,
title = "The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples",
abstract = "As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100 au, 13 of which have sufficient historical measurements to allow for refinement of their orbital elements. For each system with an estimated orbit, the dynamical system mass obtained was compared with the system mass estimated from mass-magnitude relations. Discrepancies between the dynamical and theoretical system mass can be explained by the presence of a previously unresolved spectroscopic component or by a non-solar metallicity of the system. Using this approach to infer the presence of additional companions, a lower limit to the fraction of binaries, triples and quadruples can be estimated as 39, 46 and 15per cent for systems with at least one companion within 100 au. The fraction of multiple systems with three or more components shows a relative increase compared to the fraction for solar-type primaries resolved in previous volume-limited surveys. The observations have also revealed a pair of potentially young (<100Myr) M dwarf companions, which would make an ideal benchmark for the theoretical models during the pre-main-sequence contraction phase for M dwarfs. In addition to those systems with orbit fits, we report 13 systems for which further orbital monitoring observations are required, 11 of which are newly resolved as a part of the VAST survey.",
keywords = "Binaries: close, Binaries: general, Techniques: high angular resolution",
author = "{De Rosa}, {R. J.} and Jennifer Patience and A. Vigan and Wilson, {P. A.} and A. Schneider and Mcconnell, {N. J.} and Wiktorowicz, {S. J.} and C. Marois and I. Song and B. Macintosh and Graham, {J. R.} and Bessell, {M. S.} and R. Doyon and O. Lai",
year = "2012",
month = "6",
doi = "10.1111/j.1365-2966.2011.20397.x",
language = "English (US)",
volume = "422",
pages = "2765--2785",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples

AU - De Rosa, R. J.

AU - Patience, Jennifer

AU - Vigan, A.

AU - Wilson, P. A.

AU - Schneider, A.

AU - Mcconnell, N. J.

AU - Wiktorowicz, S. J.

AU - Marois, C.

AU - Song, I.

AU - Macintosh, B.

AU - Graham, J. R.

AU - Bessell, M. S.

AU - Doyon, R.

AU - Lai, O.

PY - 2012/6

Y1 - 2012/6

N2 - As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100 au, 13 of which have sufficient historical measurements to allow for refinement of their orbital elements. For each system with an estimated orbit, the dynamical system mass obtained was compared with the system mass estimated from mass-magnitude relations. Discrepancies between the dynamical and theoretical system mass can be explained by the presence of a previously unresolved spectroscopic component or by a non-solar metallicity of the system. Using this approach to infer the presence of additional companions, a lower limit to the fraction of binaries, triples and quadruples can be estimated as 39, 46 and 15per cent for systems with at least one companion within 100 au. The fraction of multiple systems with three or more components shows a relative increase compared to the fraction for solar-type primaries resolved in previous volume-limited surveys. The observations have also revealed a pair of potentially young (<100Myr) M dwarf companions, which would make an ideal benchmark for the theoretical models during the pre-main-sequence contraction phase for M dwarfs. In addition to those systems with orbit fits, we report 13 systems for which further orbital monitoring observations are required, 11 of which are newly resolved as a part of the VAST survey.

AB - As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100 au, 13 of which have sufficient historical measurements to allow for refinement of their orbital elements. For each system with an estimated orbit, the dynamical system mass obtained was compared with the system mass estimated from mass-magnitude relations. Discrepancies between the dynamical and theoretical system mass can be explained by the presence of a previously unresolved spectroscopic component or by a non-solar metallicity of the system. Using this approach to infer the presence of additional companions, a lower limit to the fraction of binaries, triples and quadruples can be estimated as 39, 46 and 15per cent for systems with at least one companion within 100 au. The fraction of multiple systems with three or more components shows a relative increase compared to the fraction for solar-type primaries resolved in previous volume-limited surveys. The observations have also revealed a pair of potentially young (<100Myr) M dwarf companions, which would make an ideal benchmark for the theoretical models during the pre-main-sequence contraction phase for M dwarfs. In addition to those systems with orbit fits, we report 13 systems for which further orbital monitoring observations are required, 11 of which are newly resolved as a part of the VAST survey.

KW - Binaries: close

KW - Binaries: general

KW - Techniques: high angular resolution

UR - http://www.scopus.com/inward/record.url?scp=84861227290&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84861227290&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2011.20397.x

DO - 10.1111/j.1365-2966.2011.20397.x

M3 - Article

AN - SCOPUS:84861227290

VL - 422

SP - 2765

EP - 2785

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -