Advancing Double Star Studies in an Age of Space-Based Astrometric Missions

PhD by Publication


Letchford, Roderick R.. 2022. Advancing Double Star Studies in an Age of Space-Based Astrometric Missions. PhD by Publication Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/q7q97
Title

Advancing Double Star Studies in an Age of Space-Based Astrometric Missions

TypePhD by Publication
Authors
AuthorLetchford, Roderick R.
Supervisor
1. FirstDr Carolyn Brown
2. SecondProf Graeme White
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages132
Year2022
PublisherUniversity of Southern Queensland
Place of PublicationAustralia
Digital Object Identifier (DOI)https://doi.org/10.26192/q7q97
Abstract

The astrometric study of double stars is over 200 years old, and historically it has been a driver of stellar astrophysics resulting in the determination of the properties of stars, as well as formation and evolution models. Modern, space-based astronomy, from missions such as HIPPARCOS and Gaia, has opened a new sophisticated avenue of binary star studies. These space missions give the astrometric measures of a double star, its angular separation in arcseconds and position angle in degrees, with precisions that are 3 to 4 orders of magnitude more precise than has been available todate from single-aperture ground observations. In this thesis, Paper 1 crossmatches the double stars from the first published catalogue of double stars in the southern hemisphere (the Dunlop Catalogue) with the Gaia Data Release 2 (Gaia DR2) from the Gaia space-based mission and estimates the accuracy of the measures in the Dunlop Catalogue. Overall position angles are within 70°'/separation', separations within 7%, and apparent visual magnitudes are within 1 mag. Paper 2 develops an iteration-based technique for the determination of the first order orbital elements for long period and under-sampled arcs. This technique is then applied to a sample of binary stars from the Dunlop Catalogue. Orbital elements with a mean period and semi-major axis of ~81,000 years and ~76' respectively, were calculated displaying a mean uncertainty of ~37%. Paper 3 confirms the presence of 14 optical double stars within the Dunlop Catalogue and presents and applies an upgraded technique for calculating their rectilinear elements. This upgraded technique results in a minimum one order of magnitude improvement in their one sigma uncertainties over the current method.

Keywordsastrometry, visual binaries, stellar kinematics, celestial mechanics
Related Output
Has partAssessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop
Has partOrbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop
Has partRectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Public Notes

Roderick R Letchford, et al., Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop, Monthly Notices of the Royal Astronomical Society, Volume 510, Issue 4, March 2022, Pages 5330–5347, https://doi.org/10.1093/mnras/stab3777 (This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society©: 2022 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.)

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Byline AffiliationsCentre for Astrophysics
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Related outputs

Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop." Astronomische Nachrichten. 343 (6-7), pp. 1-14. https://doi.org/10.1002/asna.20220018
Orbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Orbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop." Astronomische Nachrichten. 343 (3), pp. 1-13. https://doi.org/10.1002/asna.20210113
Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop." Monthly Notices of the Royal Astronomical Society. 510 (4), pp. 5330-5347. https://doi.org/10.1093/mnras/stab3777