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The discrepancy bet...
The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394
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- Calissendorff, Per (author)
- Stockholms universitet,Institutionen för astronomi
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- Janson, Markus (author)
- Stockholms universitet,Institutionen för astronomi
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Koehler, Rainer (author)
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Durkan, Stephen (author)
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Hippler, Stefan (author)
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Dai, Xiaolin (author)
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Brandner, Wolfgang (author)
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Schlieder, Joshua (author)
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Henning, Thomas (author)
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(creator_code:org_t)
- 2017-08-11
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 604
- Related links:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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-circle dot. 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-circle dot 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 8.4(-0.021)(+0.04) yr.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- astrometry
- binaries: close
- stars: low-mass
- stars: kinematics and dynamics
- Astronomy
- astronomi
Publication and Content Type
- ref (subject category)
- art (subject category)
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