2001A&A...367..183L


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST05:39:17

2001A&A...367..183L - Astronomy and Astrophysics, volume 367, 183-188 (2001/2-3)

Dynamical mass determination for the very low mass stars LHS 1070 B and C.

LEINERT C., JAHREISS H., WOITAS J., ZUCKER S., MAZEH T., ECKART A. and KOEHLER R.

Abstract (from CDS):

We followed the relative orbit of the close pair of very late-type stars in the nearby triple system LHS 1070 during the past seven years. These observations are used to derive the astrometric elements of the orbit. Using the period of 16.1±1.4 years and assuming the distance of 7.39pc given by van Altena (1995) to be exactly correct, the combined mass of components B and C is 0.138±0.003M. Otherwise, this mass scales with the third power of the distance, which presently is not known to better than 9%. The dynamical mass would equal the combined mass of 0.161±0.002M derived from the theoretical mass-luminosity relation of Baraffe et al. (1998A&A...337..403B) and Chabrier et al. (2000ApJ...542..464C) for a 5% larger distance of 7.78pc. A critical comparison with the theoretical relations therefore has to await more precise parallax determinations for this comparatively faint system with visual magnitude V=15.3. The wide orbit of component A around the center of mass of components B and C cannot yet be determined from our measurements. However, we can show that it is probably co-planar with the close pair orbit and should have a period in the range 60-1000 years.

Abstract Copyright:

Journal keyword(s): low-mass stars - binaries - mass-luminosity relation

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 LP 881-64 ** 00 24 44.220360 -27 08 25.04904   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve 114 0
2 G 272-61B Fl* 01 39 01.6334059022 -17 57 01.121866655     13.2     M6V 779 0
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1426 1
4 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 399 0
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10927 0
6 V* EZ Aqr BY* 22 38 33.576000 -15 17 59.75700 15.762 14.33 12.38 12.12 8.677 M5V 277 1

    Equat.    Gal    SGal    Ecl

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2019.09.21-05:39:17

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