2008A&A...484..429S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET11:53:49

2008A&A...484..429S - Astronomy and Astrophysics, volume 484, 429-434 (2008/6-3)

Improved orbital solution and masses for the very low-mass multiple system LHS 1070.

SEIFAHRT A., ROELL T., NEUHAEUSER R., REINERS A., KERBER F., KAEUFL H.U., SIEBENMORGEN R. and SMETTE A.

Abstract (from CDS):

We present a refined orbital solution for the components A, B, and C of the nearby late-M type multiple system LHS 1070. By combining astrometric datapoints from NACO/VLT, CIAO/SUBARU, and PUEO/CFHT, as well as a radial velocity measurement from the newly commissioned near infrared high-resolution spectrograph CRIRES/VLT, we achieve a very precise orbital solution for the B and C components and a first realistic constraint on the much longer orbit of the A-BC system. Both orbits appear to be co-planar. Masses for the B and C components calculated from the new orbital solution (MB+C=0.157±0.009M) are in excellent agreement with theoretical models, but do not match empirical mass-luminosity tracks. The preliminary orbit of the A-BC system reveals no mass excess for the A component, giving no indication for a previously proposed fourth (D) component in LHS 1070.

Abstract Copyright:

Journal keyword(s): astrometry - stars: binaries - close, stars: low-mass, brown dwarfs

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 85 ** 00 05 44.4457 +17 50 25.046           F5V+F5V 31 1
2 LP 881-64 ** 00 24 44.220360 -27 08 25.04904   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve 120 0
3 G 208-44 Er* 19 53 54.4821159649 +44 24 51.341564299   15.31 13.126 13.083 9.78 M5.5Ve 187 1
4 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2926 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-11:53:49

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