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

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

20

Low-Mass Stars, Binaries, Mass-Luminosity Relation

Scientific paper

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 7.39 pc given by van Altena (\cite{vanaltena95}) to be exactly correct, the combined mass of components B and C is 0.138 +/- 0.003 Msun. 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 +/- 0.002 Msun derived from the theoretical mass-luminosity relation of Baraffe et al. (\cite{baraffe98}) and Chabrier et al. (\cite{chabrier2000}) for a 5% larger distance of 7.78 pc. 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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Dynamical mass determination for the very low mass stars LHS 1070 B and C does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dynamical mass determination for the very low mass stars LHS 1070 B and C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical mass determination for the very low mass stars LHS 1070 B and C will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1711255

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.