Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary

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Maqueo Chew, Y. GomezUniv Nacl Autonoma Mexico, Inst Astron, Ciudad Univ, Mexico City 04510, DF, Mexico (författare)

Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary

Artikel/kapitelEngelska2019

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2019-02-26
EDP Sciences,2019
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LIBRIS-ID:oai:DiVA.org:uu-379587
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379587URI
https://doi.org/10.1051/0004-6361/201833299DOI

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Språk:engelska
Sammanfattning på:engelska

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We present the most comprehensive analysis to date of the Upper Centaurus Lupus eclipsing binary MML 53 (with P-EB = 2.097892 d), and for the first time, confirm the bound-nature of the third star (in a P-3 similar to 9 yr orbit) by constraining its mass dynamically. Our analysis is based on new and archival spectra and time-series photometry, spanning 80% of one orbit of the outer component. From the spectroscopic analysis, we determined the temperature of the primary star to be 4880 +/- 100 K. The study of the close binary incorporated treatment of spots and dilution by the tertiary in the light curves, allowing for the robust measurement of the masses of the eclipsing components within 1% (M-1 = 1.0400 +/- 0.0067 M-circle dot and M-2 = 0.8907 +/- 0.0058 M-circle dot), their radii within 4.5% (R-1 = 1.283 +/- 0.043 R-circle dot and R-2 = 1.107 +/- 0.049 R-circle dot), and the temperature of the secondary star (T-eff,T-2 = 4379 +/- 100 K). From the analysis of the eclipse timings, and the change in systemic velocity of the eclipsing binary and the radial velocities of the third star, we measured the mass of the outer companion to be 0.7 M-circle dot (with a 20% uncertainty). The age we derived from the evolution of the temperature ratio between the eclipsing components is fully consistent with previous, independent estimates of the age of Upper Centaurus Lupus (16 +/- 2 Myr). At this age, the tightening of the MML 53 eclipsing binary has already occurred, thus supporting close-binary formation mechanisms that act early in the stars' evolution. The eclipsing components of MML 53 roughly follow the same theoretical isochrone, but appear to be inflated in radius (by 20% for the primary and 10% for the secondary) with respect to recent evolutionary models. However, our radius measurement of the 1.04 M-circle dot primary star of MML 53 is in full agreement with the independent measurement of the secondary of NP Per which has the same mass and a similar age. The eclipsing stars of MML 53 are found to be larger but not cooler than predicted by non-magnetic models, it is not clear what is the mechanism that is causing the radius inflation given that activity, spots and/or magnetic fields slowing their contraction, require the inflated stars to be cooler to remain in thermal equilibrium.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
binaries: eclipsing
binaries: spectroscopic
stars: fundamental parameters
stars: pre-main sequence
stars: low-mass
stars: individual: MML 53

Biuppslag (personer, institutioner, konferenser, titlar ...)

Hebb, L.Hobart & William Smith Coll, Dept Phys, Geneva, NY 14456 USA (författare)
Stempels, Henricus CornelisUppsala universitet,Observationell astrofysik(Swepub:uu)ericstem (författare)
Paat, A.Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA (författare)
Stassun, K. G.Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA;Fisk Univ, Dept Phys, Nashville, TN USA (författare)
Faedi, F.Osserv Astrofis Catania, INAF, Via S Sofia 78, I-95123 Catania, Italy;Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England (författare)
Street, R. A.Las Cumbres Observ Global Telescope Network, 6740 Cortona Dr Suite 102, Goleta, CA 93117 USA (författare)
Rohn, G.SUNY Coll Cortland, Dept Phys, Cortland, NY 13045 USA (författare)
Hellier, C.Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England (författare)
Anderson, D. R.Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England (författare)
Univ Nacl Autonoma Mexico, Inst Astron, Ciudad Univ, Mexico City 04510, DF, MexicoHobart & William Smith Coll, Dept Phys, Geneva, NY 14456 USA (creator_code:org_t)

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Ingår i:Astronomy and Astrophysics: EDP Sciences6230004-63611432-0746

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Av författaren/redakt...: Maqueo Chew, Y. ...; Hebb, L.; Stempels, Henric ...; Paat, A.; Stassun, K. G.; Faedi, F.; visa fler...; Street, R. A.; Rohn, G.; Hellier, C.; Anderson, D. R.; visa färre...

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