- ID:
- ivo://CDS.VizieR/J/ApJ/844/103
- Title:
- Orbit alignment in triple stars
- Short Name:
- J/ApJ/844/103
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The statistics of the angle {Phi} between orbital angular momenta in hierarchical triple systems with known inner visual or astrometric orbits are studied. A correlation between apparent revolution directions proves the partial orbit alignment known from earlier works. The alignment is strong in triples with outer projected separation less than ~50au, where the average {Phi} is about 20{deg}. In contrast, outer orbits wider than 1000 au are not aligned with the inner orbits. It is established that the orbit alignment decreases with the increasing mass of the primary component. The average eccentricity of inner orbits in well-aligned triples is smaller than in randomly aligned ones. These findings highlight the role of dissipative interactions with gas in defining the orbital architecture of low-mass triple systems. On the other hand, chaotic dynamics apparently played a role in shaping more massive hierarchies. The analysis of projected configurations and triples with known inner and outer orbits indicates that the distribution of {Phi} is likely bimodal, where 80% of triples have {Phi}<70{deg} and the remaining ones are randomly aligned.
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Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/422/2765
- Title:
- Orbital motion monitoring of A-star multiples
- Short Name:
- J/MNRAS/422/2765
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As a part of our ongoing Volume-limited A-Star (VAST) adaptive optics survey, we have obtained observations of 26 binary systems with projected separations <100AU, 13 of which have sufficient historical measurements to allow for refinement of their orbital elements. For each system with an estimated orbit, the dynamical system mass obtained was compared with the system mass estimated from mass-magnitude relations. Discrepancies between the dynamical and theoretical system mass can be explained by the presence of a previously unresolved spectroscopic component, or by a non-solar metallicity of the system. Using this approach to infer the presence of additional companions, a lower limit to the fraction of binaries, triples, and quadruples can be estimated as 39%, 46%, and 15%, for systems with at least one companion within 100AU. The fraction of multiple systems with three or more components shows a relative increase compared to the fraction for Solar-type primaries resolved in previous volume-limited surveys. The observations have also revealed a pair of potentially young (<100Myr) M-dwarf companions, which would make an ideal benchmark for the theoretical models during the pre-Main Sequence contraction phase for M-dwarfs. In addition to those systems with orbit fits, we report 13 systems for which further orbital monitoring observations, are required, 11 of which are newly resolved as a part of the VAST survey.
- ID:
- ivo://CDS.VizieR/J/AJ/154/110
- Title:
- Orbits based on SOAR speckle interferometry. II.
- Short Name:
- J/AJ/154/110
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Orbits of 44 close and fast visual binaries are computed using the latest speckle observations; 23 orbits are determined for the first time, and the rest are revisions, some of those substantial. Six combined orbits use radial velocities. The median period is 15.6 years, and the shortest period is one year. Most stars are nearby late-type dwarfs. Dynamical parallaxes and estimates of the masses are derived from the orbital elements and the photometry of the components.
- ID:
- ivo://CDS.VizieR/J/AJ/152/138
- Title:
- Orbits based on speckle interferometry at SOAR
- Short Name:
- J/AJ/152/138
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The orbits of 55 visual binary stars are computed using recent speckle interferometry data from the SOAR telescope: 33 first-time orbits and 22 revisions of previous orbit calculations. The orbital periods range from 1.4-370 years, and the quality of the orbits ranges from definitive to preliminary and tentative. Most binaries consist of low-mass dwarfs and have short periods (median period 31 years). The dynamical parallaxes and masses are evaluated and compared to the Hipparcos parallaxes. Using differential speckle photometry, binary components are placed on the color-magnitude diagram.
- ID:
- ivo://CDS.VizieR/J/AJ/156/194
- Title:
- Orbits of double-lined pairs in multiple stars
- Short Name:
- J/AJ/156/194
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Spectroscopic orbits are computed for inner pairs in nine hierarchical multiple systems (HIP 19639, 60845, 75663, 76816, 78163, 78416, 80448, 84789, and HD 105080) and for one simple binary HIP 61840. All subsystems are double-lined, and their periods range from 2.27 to 30.4 days. Five spectroscopic binaries are twins with equal masses. Each hierarchical system is discussed individually, providing estimates of outer periods, masses, orbital inclination, and axial rotation. For systems with three resolved visual components (HIP 60845 and 80448), the outer and inner visual orbits are determined, complementing the description of their architecture. The radial velocities of HIP 75663A, 76816B, and 78163B are found to be variable with long periods, implying that these hierarchies are 2 + 2 quadruples. The period-eccentricity relation for spectroscopic subsystems is discussed.
- ID:
- ivo://CDS.VizieR/J/AJ/124/1144
- Title:
- Orbits of 171 single-lined spectroscopic binaries
- Short Name:
- J/AJ/124/1144
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- 25,563 radial velocity measurements are reported for 1359 single-lined stars in the Carney-Latham sample of 1464 stars selected for high proper motion; for 171 of these, spectroscopic orbital solutions are derived. The radial velocities of nearly all of the 1464 stars defined in Paper XII (J/AJ/107/2240) have been monitored with the CfA Digital Speedometers (see Latham 1985, in IAU Colloq. 88, 21; and 1992, in IAU Colloq. 135, 110). Three nearly identical instruments have been used on the Multiple Mirror Telescope and 1.5 m Tillinghast Reflector at the F.L. Whipple Observatory atop Mount Hopkins, Arizona, and on the 1.5m Wyeth Reflector located at the Oak Ridge Observatory in the town of Harvard, Massachusetts. Echelle spectrographs have been used with photon counting intensified Reticon detectors to record about 45Angstroems of spectrum in a single order. Most of the spectra were centered near 5187Angstroems, but a significant number of the early spectra were centered near 5197Angstroems. The shift in central wavelength was adopted in order to include all three lines of the Mgb triplet, after it was fully appreciated that all the other lines in our spectral window became extremely weak for our most metal-poor stars. The spectral resolution is about 8.5km.s-1 for all our exposures, and the signal-to-noise ratios range from about 5 to 50 per resolution element.
- ID:
- ivo://CDS.VizieR/J/PAZh/45/35
- Title:
- Orbits of 451 wide visual double stars
- Short Name:
- J/PAZh/45/35
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- Based on positional observations, we have determined the orbits of 130 visual double stars for the first time and improved the orbits of 321 stars. The histogram of eccentricities for all of the derived orbits corresponds to the relation f=2e. The period distribution has two pronounced maxima at P~200 and 550yr. The ephemeris relative positions and their errors have been calculated for the next three years.
- ID:
- ivo://CDS.VizieR/J/AJ/160/6
- Title:
- OSMOS & modspec RVs of 30 cataclysmic variables
- Short Name:
- J/AJ/160/6
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present spectroscopy and orbital periods Porb for 30 apparently nonmagnetic cataclysmic binaries with periods below ~3hr, nearly all of which are dwarf novae, mostly of the SU Ursae Majoris subclass. We then turn to the evidence supporting the prediction that short-period dwarf novae evolve toward longer periods after passing through a minimum period-the "period bounce" phenomenon. Plotting data from the literature reveals that for superhump period excess {epsilon}=(P_sh_-P_orb_)/P_orb_ below ~0.015, the period appears to increase with decreasing {epsilon}, agreeing at least qualitatively with the predicted behavior. Next, motivated by the long (decadal) outburst intervals of the WZ Sagittae subclass of short-period dwarf novae, we ask whether there could be a sizable population of "lurkers"-systems that resemble dwarf novae at minimum light, but which do not outburst over accessible timescales (or at all) and therefore do not draw attention to themselves. By examining the outburst history of the Sloan Digital Sky Survey sample of Cataclysmic Variables (CVs), which were selected by color and not by outburst, we find that a large majority of the color-selected dwarf-nova-like objects have been observed to outburst, and we conclude that "lurkers," if they exist, are a relatively minor part of the CV population.
- ID:
- ivo://CDS.VizieR/J/AJ/154/105
- Title:
- Parameters of 529 Kepler eclipsing binaries
- Short Name:
- J/AJ/154/105
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present precise values of the eccentricity and periastron angle of 529 detached, eccentric, eclipsing stars from the Kepler Eclipsing Binary catalog that were determined by modeling their long cadence data. The temperatures and relative radii of their components as well as their mass ratios were calculated based on approximate values of the empirical relations of MS stars. Around one-third of the secondary components were revealed to be very late dwarfs, some of them possible brown dwarf candidates. Most of our targets fall below the envelope P(1-e^2^)^3/2^=5days. The (e,P) distribution of the known eccentric binaries exhibits a rough trend of increasing eccentricity with the period. The prolonged and continuous Kepler observations allowed us to identify 60 new highly eccentric targets with e>0.5.
- ID:
- ivo://CDS.VizieR/V/41
- Title:
- Physical parameters of spectroscopic binaries
- Short Name:
- V/41
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalogue contains all stars listed in the 7th Catalogue of Spectroscopic Binaries (Batten, 1967PDAO...13..119B), supplements by Pedoussaut et al.: 1971A&AS....4..253P (11), 1973A&AS...10..105P (12) and 1977A&AS...27...55P (13), and data picked up by the authors from current publications up to the beginning of 1978.
