E. Budding
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View article: Absolute parameters of young stars: NO Puppis
Absolute parameters of young stars: NO Puppis Open
The southern early-type, young, eccentric-orbit eclipsing binary NO Puppis forms the A component of the multiple star Gaia DR3 5528147999779517568. The B component is an astrometric binary now at a separation of about 8.1 arcsec. There may…
View article: Comparative study of the W UMa type binaries S Ant and Epsilon CrA
Comparative study of the W UMa type binaries S Ant and Epsilon CrA Open
Contact binaries challenge contemporary stellar astrophysics with respect to their incidence, structure and evolution. We explore these issues through a detailed study of two bright examples: S Ant and Eps CrA, that permit high-resolution …
View article: IBN SINA’S OBSERVATION OF A TRANSIT OF VENUS IN 1032
IBN SINA’S OBSERVATION OF A TRANSIT OF VENUS IN 1032 Open
It has been said that the Venus transit of 24 May 1032 was observed by Ibn Sina and recorded among his written output. This was critically evaluated by Goldstein (1969), who demurred on the claim. However, Kapoor's (2013) thorough review h…
View article: ESTIMATING ORBITAL PARAMETERS FOR VISUAL DOUBLE STARS
ESTIMATING ORBITAL PARAMETERS FOR VISUAL DOUBLE STARS Open
A Bayesian optimisation technique was applied to estimate orbital parameters for the visual double stars Sirius, α Cen, AGC11AB, BU151AB, BU513AB, BU648, BU883AB, STT38BC, and STF1196AB. These estimates were compared with those adopted by …
View article: ESTIMATING ORBITAL PARAMETERS FOR VISUAL DOUBLE STARS
ESTIMATING ORBITAL PARAMETERS FOR VISUAL DOUBLE STARS Open
A Bayesian optimisation technique was applied to estimate orbital parameters for the visual double stars Sirius, ? Cen, AGC11AB, BU151AB, BU513AB, BU648, BU883AB, STT38BC, and STF1196AB. These estimates were compared with those adopted by …
View article: Comparative study of the W UMa type binaries S Ant and ε CrA
Comparative study of the W UMa type binaries S Ant and ε CrA Open
Contact binaries challenge contemporary stellar astrophysics with respect to their incidence, structure, and evolution. We explore these issues through a detailed study of two bright examples: S Ant and $\varepsilon$ CrA, that permit high-…
View article: The enigmatic multiple star VV Ori
The enigmatic multiple star VV Ori Open
New photometry, including TESS data, have been combined with recent spectroscopic observations of the Orion Ib pulsating triple-star system VV Ori. This yields a revised set of absolute parameters with increased precision. Two different pr…
View article: The enigmatic multiple star VV Ori
The enigmatic multiple star VV Ori Open
New photometry, including TESS data, have been combined with recent spectroscopic observations of the Orion Ib pulsating triple-star system VV Ori. This yields a revised set of absolute parameters with increased precision. Two different pr…
View article: Markov Chain Monte Carlo applied to the Double Stars of Miller and Pitman
Markov Chain Monte Carlo applied to the Double Stars of Miller and Pitman Open
Model orbits have been fitted to 27 physical double stars listed in a 1922 catalogue. A Markov Chain Monte Carlo technique was applied to estimate best fitting values and associated uncertainties for the orbital parameters. Dynamical masse…
View article: Markov Chain Monte Carlo Optimization applied to Dyson's Visual Double Stars
Markov Chain Monte Carlo Optimization applied to Dyson's Visual Double Stars Open
Estimates of orbital parameters were made using a Bayesian optimization technique on astrometric data for 25 visual binary systems catalogued a century ago by the ninth Astronomer Royal, Sir Frank Dyson. An advantage of this method is that…
View article: V410 Puppis: A useful laboratory for early stellar evolution
V410 Puppis: A useful laboratory for early stellar evolution Open
New spectrometric (HERCULES) and ground-based multi-colour photometric data on the multiple star V410 Puppis are combined with satellite photometry (HIPPARCOS and TESS), as well as historic astrometric observations. Absolute parameters for…
View article: Absolute parameters of young stars: PU Pup
Absolute parameters of young stars: PU Pup Open
We present combined photometric and spectroscopic analyses of the southern binary star PU Pup. High-resolution spectra of this system were taken at the University of Canterbury Mt. John Observatory in the years 2008 and again in 2014–2015.…
View article: <i>BVRI</i> Photometric Observations, Light Curve Solutions and Orbital Period Analysis of BF Pav
<i>BVRI</i> Photometric Observations, Light Curve Solutions and Orbital Period Analysis of BF Pav Open
A new ephemeris, period change analysis and light curve modeling of the W UMa-type eclipsing binary BF Pav are presented in this study. Light curves of the system taken in BVRI filters from two observatories, in Australia and Argentina, we…
View article: Absolute parameters of young stars: V puppis
Absolute parameters of young stars: V puppis Open
New spectrometric data on V Pup are combined with satellite photometry [HIPPARCOS and recent Transiting Exoplanet Survey Satellite (TESS)] to allow a revision of the absolute parameters with increased precision. We find: M1 = 14.0 ± 0.5, M…
View article: BVRI Photometric Observations, Light Curve Solutions and Orbital Period\n Analysis of BF Pav
BVRI Photometric Observations, Light Curve Solutions and Orbital Period\n Analysis of BF Pav Open
A new ephemeris, period change analysis and light curve modeling of the W\nUMa-type eclipsing binary BF Pav are presented in this study. Light curves of\nthe system taken in BVRI filters from two observatories in Australia and\nArgentina w…
View article: An Update on the Student Exoplanet Programme
An Update on the Student Exoplanet Programme Open
An update is given on the exoplanet research collaboration between Nielsen (a marketing research company), Brigham Young University, and NZ universities with the National University of Singapore, which has been expanded to include a commun…
View article: QZ Carinae Orbit of the Two Binary Pairs
QZ Carinae Orbit of the Two Binary Pairs Open
We present an updated O-C diagram of the light-time variations of the eclipsing binary (component B) in the system QZ Carinae as it moves in the long-period orbit around the non-eclipsing pair (component A). This includes new Variable Star…
View article: New light on R Arae
New light on R Arae Open
In mid-2018, efforts were renewed to check on the highly active mass-transfer process shown by the classical Algol system R Arae.We present new light curves and times of light minimum from this project.We also extend R Arae's period O-C di…
View article: Exoplanets and University-Industry Collaboration
Exoplanets and University-Industry Collaboration Open
A brief review is given of a university outreach programme by a commercial organisation, which uses the Kepler exoplanet data. Key insights derived from this research are presented, along with discussion of the benefi ts and challenges of …
View article: Absolute parameters of young stars: GG Lup and μ1 Sco
Absolute parameters of young stars: GG Lup and μ1 Sco Open
New high-resolution spectroscopy and $BVR$ photometry, together with\nliterature data, on the Gould's Belt close binary systems GG Lup and $\\mu^1$\nSco are presented and analysed.\n In the case of GG Lup, light and radial velocity curve f…