Orbits of four young triple-lined multiple systems. (2016)
Keywords :
binaries general - binaries: spectroscopic - stars: solar-type
Abstract:Each of the nearby triple systems HIP 7601, 13498, 23824, and 113597 (HD 10800, 18198, 35877, 217379) consist of solar-type dwarfs with comparable masses, where all three components are resolved spectrally, while the outer pairs are resolved both visually and spectrally. These stars are relatively young (between 100 and 600Myr) and chromospherically active (X-ray sources), although they rotate slowly. I determine the spectroscopic orbits of the inner subsystems (periods 19.4, 14.1, 5.6, 20.3days) and the orbits of the outer systems (periods 1.75, 51, 27, 500years, respectively). For HIP 7601 and 13498, the combined spectro-interferometric outer orbits produce direct measurement of the masses of all of the components, allowing
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Most spectra used here were taken with the 1.5m telescope located at
the Cerro Tololo Interamerican Observatory in Chile, which is operated
by the Small & Moderate Aperture Research Telescope System (SMARTS)
Consortium (http://www.astro.yale.edu/smarts/). The observing time was
allocated through NOAO (programs 14B-0009, 15A-0055, 15B-0012). The
observations were made with the fiber-fed echelle spectrograph CHIRON
(http://www.ctio.noao.edu/noao/content/chiron) by the telescope
operators in service mode. The spectra taken in the slicer mode have a
resolution of R=80000 and a signal-to-noise ratio (S/N) of at least
20. They cover the range from 415 to 880nm in 53 orders.
Thorium-argon calibrations were recorded for each target. A few
spectra taken in 2010 at the same telescope with the Fiber Echelle
(FECH) with a resolution of R=44000 are also used here.
Information on the resolved outer subsystems has been retrieved from
the Washington Double Star Catalog (WDS; Cat. B/wds). It is
complemented by recent speckle interferometry from the SOuthern
Astrophysical Research (SOAR) telescope. The latest publication
(Tokovinin et al. 2015, Cat. J/AJ/150/50) contains references to the
previous papers of this series. Observations made in 2015 and 2016 are
not yet published.
In the ESO archive, I found 11 spectra of HIP7601 taken with HARPS in
the period from 2009 to 2012 (program 088C.513 and its continuation).
The spectral resolution is very similar to that of CHIRON: R=80000.
- B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014)
- B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
- V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
- I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
- I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
- III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
- J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)
- J/AJ/149/195 : Spectroscopy of the quadruple system HD91962 (Tokovinin+, 2015)
- J/AJ/149/8 : RV of southern visual multiple stars (Tokovinin+, 2015)
- J/AJ/147/87 : From binaries to multiples. II. Statistics (Tokovinin, 2014)
- J/AJ/147/86 : From binaries to multiples. I. FG-67 sample (Tokovinin, 2014)
- J/A+A/568/A26 : SACY. V. Multiple systems (Elliott+, 2014)
- J/AJ/143/42 : Speckle interferometry with SOAR in 2010-2011 (Hartkopf+, 2012)