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The discrepancy bet...
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Calissendorff, PerStockholms universitet,Institutionen för astronomi
(author)
The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394
- Article/chapterEnglish2017
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2017-08-11
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EDP Sciences,2017
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LIBRIS-ID:oai:DiVA.org:su-147943
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147943URI
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https://doi.org/10.1051/0004-6361/201730725DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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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.
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Janson, MarkusStockholms universitet,Institutionen för astronomi(Swepub:su)mjanso
(author)
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Koehler, Rainer
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Durkan, Stephen
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Hippler, Stefan
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Dai, Xiaolin
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Brandner, Wolfgang
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Schlieder, Joshua
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Henning, Thomas
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences6040004-63611432-0746
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