2011A&A...531A..61H


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:56:02

2011A&A...531A..61H - Astronomy and Astrophysics, volume 531A, 61-61 (2011/7-1)

Precise orbit solution of MML 53, a low-mass, pre-main sequence eclipsing binary in Upper Centaurus Lupus.

HEBB L., CEGLA H.M., STASSUN K.G., STEMPELS H.C., CARGILE P.A. and PALLADINO L.E.

Abstract (from CDS):

We present a double-lined orbit solution for MML 53, the recently discovered low-mass pre-main sequence eclipsing binary. Using high-resolution spectra from the SMARTS 1.5m echelle spectrograph, we measure precise radial velocities and derive the orbital parameters of the system. The 2.1 d orbit of the eclipsing pair is circular, and we find the minimum masses of the eclipsing components to be M1sin3i=0.97M and M2 sin3i=0.84M, with formal uncertainties of 2.0% and an additional systematic uncertainty of ≃2.5% most likely caused by large star spots on the primary star. MML 53 has been previously identified as a member of the Upper Centaurus Lupus (UCL) star forming region (age ∼15Myr). The systemic radial velocity from our orbit solution, vγ=+1.4±0.3±0.8km/s (statistical and systematic), is also consistent with kinematic membership in this association. In addition, we detect a change in vγ between 2006 and 2009 providing further evidence for the presence of a the third body in a wide (several year) orbit.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: pre-main sequence - binaries: spectroscopic - stars: fundamental parameters - stars: individual: MML 53

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 406 0
2 CD-35 9931 TT* 14 58 37.6885363563 -35 40 30.390196098   11.92 10.75   9.85 K2.5IV 28 0
3 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 360 1

    Equat.    Gal    SGal    Ecl

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2020.08.04-22:56:02

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