Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-29
Astronomy and Astrophysics
Astrophysics
Astronomy & Astrophysics, in press (16 pages, 12 figures); also available at http://www.astro.ulb.ac.be/Html/ps.html#Astrometr
Scientific paper
10.1051/0004-6361:20053003
Hipparcos Intermediate Astrometric Data (IAD) have been used to derive astrometric orbital elements for spectroscopic binaries from the newly released Ninth Catalogue of Spectroscopic Binary Orbits (SB9). Among the 1374 binaries from SB9 which have an HIP entry, 282 have detectable orbital astrometric motion (at the 5% significance level). Among those, only 70 have astrometric orbital elements that are reliably determined (according to specific statistical tests discussed in the paper), and for the first time for 20 systems, representing a 10% increase relative to the 235 DMSA/O systems already present in the Hipparcos Double and Multiple Systems Annex. The detection of the astrometric orbital motion when the Hipparcos IAD are supplemented by the spectroscopic orbital elements is close to 100% for binaries with only one visible component, provided that the period is in the 50 - 1000 d range and the parallax is larger than 5 mas. This result is an interesting testbed to guide the choice of algorithms and statistical tests to be used in the search for astrometric binaries during the forthcoming ESA Gaia mission. Finally, orbital inclinations provided by the present analysis have been used to derive several astrophysical quantities. For instance, 29 among the 70 systems with reliable astrometric orbital elements involve main sequence stars for which the companion mass could be derived. Some interesting conclusions may be drawn from this new set of stellar masses, like the enigmatic nature of the companion to the Hyades F dwarf HIP 20935. This system has a mass ratio of 0.98 but the companion remains elusive.
Babusiaux Carine
Jancart Sylvie
Jorissen Alain
Pourbaix Dimitri
No associations
LandOfFree
Astrometric orbits of SB9 stars 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 Astrometric orbits of SB9 stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Astrometric orbits of SB9 stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-562092