Binary Stars With Components of Solar Type: 25 Orbits and System Masses

We report on the results of speckle observations at the 4.1 m SOAR telescope in 2010 and 2011. A total of 639 objects were observed. We give 562 measurements of 418 resolved binaries, including 21 pairs resolved for the first time, and upper detection limits for 221 unresolved stars. New orbital elements have been determined for 42 physical pairs, of which 22 are first-time calculations; the rest are corrections, sometimes substantial. Linear elements are calculated for nine apparently optical doubles. We comment on new pairs, new orbital solutions, and other remarkable objects.

show abstract

“…It was not resolved here despite predicted separation of 0. 07; the visual orbit of Docobo & Ling (2009b) therefore needs revision.…”

Section: Notes On Individual Objectsmentioning

confidence: 99%

Speckle Interferometry at Soar in 2010 and 2011: Measures, Orbits, and Rectilinear Fits

Hartkopf

Tokovinin

Mason

2012

The Astronomical Journal

268

View full text Add to dashboard Cite

show abstract

“…References. -a:Docobo & Ling (2010); b: Rica (2013); c:Heintz (1998);d: Heintz (1963); e:Mason et al (2004a); f:Docobo & Ling (2009); g:Heintz (1996b); h: citetHeintz2001; i: Heintz (1975); j: Heintz (1998); k:Cvetkovic (2011) …”

mentioning

confidence: 99%

A SURVEY OF THE HIGH ORDER MULTIPLICITY OF NEARBY SOLAR-TYPE BINARY STARS WITH Robo-AO

Riddle

Tokovinin

Mason

et al. 2015

ApJ

272

View full text Add to dashboard Cite

We conducted a survey of nearby binary systems composed of main sequence stars of spectral types F and G in order to improve our understanding of the hierarchical nature of multiple star systems. Using Robo-AO, the first robotic adaptive optics instrument, we collected high angular resolution images with deep and well-defined detection limits in the SDSS i band. A total of 695 components belonging to 595 systems were observed. We prioritized observations of faint secondary components with separations over 10 to quantify the still poorly constrained frequency of their sub-systems. Of the 214 secondaries observed, 39 contain such subsystems; 19 of those were discovered with Robo-AO. The selection-corrected frequency of secondary sub-systems with periods from 10 3.5 to 10 5 days is 0.12±0.03, the same as the frequency of such companions to the primary. Half of the secondary pairs belong to quadruple systems where the primary is also a close pair, showing that the presence of subsystems in both components of the outer binary is correlated. The relatively large abundance of 2+2 quadruple systems is a new finding, and will require more exploration of the formation mechanism of multiple star systems. We also targeted close binaries with periods less than 100 yr, searching for their distant tertiary components, and discovered 17 certain and 2 potential new triples. In a subsample of 241 close binaries, 71 have additional outer companions. The overall frequency of tertiary components is not enhanced, compared to all (non-binary) targets, but in the range of outer periods from 10 6 to 10 7.5 days (separations on the order of 500 AU), the frequency of tertiary components is 0.16±0.03, exceeding by almost a factor of two the frequency of similar systems among all targets (0.09). Measurements of binary stars with Robo-AO allowed us to compute first orbits for 9 pairs and to improve orbits of another 11 pairs.

show abstract

“…This ninth-magnitude star (HD 2236888, G5V) appeared to be a normal tight visual binary, first resolved by R. Aitken in 1913 (A 2700, ADS 17052, WDS J23518−0637). The visual orbit with a 30 yr period, last updated by Docobo & Ling (2009), is very well constrained. It is fully covered by accurate speckle measurements (the first one in 1985) and is rated grade 2 in the orbit catalog.…”

Section: Hip 117666 (Quadruple)mentioning

confidence: 99%

Spectroscopic Orbits of Subsystems in Multiple Stars. IX

Tokovinin

2023

View full text Add to dashboard Cite

New spectroscopic orbits of inner subsystems in 14 hierarchies are determined from long-term monitoring with the optical echelle spectrometer, CHIRON. Their main components are nearby solar-type stars belonging to nine triple systems (HIP 3645, 14307, 36165, 79980, 103735, 103814, 104440, 105879, 109443) and five quadruples of 2 + 2 hierarchy (HIP 41171, 49336, 75663, 78163, and 117666). The inner periods range from 254 days to 18 yr. Inner subsystems in HIP 3645, 14313, 79979, 103735, 104440, and 105879 are resolved by speckle interferometry, and their combined spectro-interferometric orbits are derived here. Astrometric orbits of HIP 49336 Aa,Ab and HIP 117666 Aa,Ab are determined from wobble in the observed motion of the outer pairs. Comparison with three spectroscopic orbits found in the Gaia data release 3 archive reveals that Gaia underestimated the amplitudes (except for HIP 109443), while the periods match approximately. This work contributes new data on the architecture of nearby hierarchical systems, complementing their statistics.

show abstract

Binary Stars With Components of Solar Type: 25 Orbits and System Masses

Cited by 18 publications

References 41 publications

Speckle Interferometry at Soar in 2010 and 2011: Measures, Orbits, and Rectilinear Fits

Speckle Interferometry at Soar in 2010 and 2011: Measures, Orbits, and Rectilinear Fits

A SURVEY OF THE HIGH ORDER MULTIPLICITY OF NEARBY SOLAR-TYPE BINARY STARS WITH Robo-AO

Spectroscopic Orbits of Subsystems in Multiple Stars. IX

Contact Info

Product

Resources

About