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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742814.0, MPI für Astronomie / Publikationen_mpia
The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394
Authors:Calissendorff, P.; Janson, M.; Köhler, R.; Durkan, S.; Hippler, S.; Dai, X.; Brandner, W.; Schlieder, J.; Henning, T.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Volume:604
Start Page:id. A82 (9 pp)
Audience:Not Specified
Abstract / Description:We combine new Lucky Imaging astrometry from New Technology Telescope/AstraLux Sur with already published astrometry from the AstraLux Large M-dwarf Multiplicity Survey to compute orbital elements and individual masses of the 2MASS J10364483+1521394 triple system belonging to the Ursa-Major moving group. The system consists of one primary low-mass M-dwarf orbited by two less massive companions, for which we determine a combined dynamical mass of MB + C = 0.48 ± 0.14 M. We show from the companions' relative motions that they are of equal mass (with a mass ratio of 1.00 ± 0.03), thus 0.24 ± 0.07 M individually, with a separation of 3.2 ± 0.3 AU, and we conclude that these masses are significantly higher (30%) than what is predicted by theoretical stellar evolutionary models. The biggest uncertainty remains the distance to the system, here adopted as 20.1 ± 2.0 pc based on trigonometric parallax, whose ambiguity has a major impact on the result. With the new observational data we are able to conclude that the orbital period of the BC pair is 8.41+0.04-0.02yr.
Free Keywords:astrometry; binaries: close; stars: low-mass; stars: kinematics and dynamics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361
URL:http://adsabs.harvard.edu/abs/2017A%26A...604A..82...
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