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The radius and other fundamental parameters of the F9 V star beta Virginis
J. R. North, J. Davis, J. G. Robertson +10
We have used the Sydney University Stellar Interferometer (SUSI) to measure the angular diameter of the F9 V star beta Virginis. After correcting for limb darkening and combining w…
Welcome back, Polaris the Cepheid
H. Bruntt, A. J. Penny, D. Stello +2
For about 100 years the amplitude of the 4-day pulsation in Polaris has decreased. We present new results showing a significant increase in the amplitude based on 4.5 years of cont…
Polaris the Cepheid returns: 4.5 years of monitoring from ground and space
H. Bruntt, N. R. Evans, D. Stello +6
We present the analysis of 4.5 years of nearly continuous observations of the classical Cepheid Polaris, which comprise the most precise data available for this star. We have made…
Oscillating K giants with the WIRE satellite: determination of their asteroseismic masses
D. Stello, H. Bruntt, H. Preston +1
Mass estimates of K giants are generally very uncertain. Traditionally, stellar masses of single field stars are determined by comparing their location in the Hertzsprung-Russell d…
A search for solar-like oscillations in K giants in the globular cluster M4
S. Frandsen, H. Bruntt, F. Grundahl +10
To expand the range in the colour-magnitude diagram where asteroseismology can be applied, we organized a photometry campaign to find evidence for solar-like oscillations in giant…
Multisite campaign on the open cluster M67. III. Delta Scuti pulsations in the blue stragglers
H. Bruntt, D. Stello, J. C. Suarez +20
We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time series from eight sites using nine 0.6-2.1…
Solar-like oscillations in open cluster stars
D. Stello, H. Bruntt, T. Arentoft +19
Asteroseismology of stellar clusters is potentially a powerful tool. The assumption of a common age, distance, and chemical composition provides constraints on each cluster member,…
Asteroseismology: a powerful tool to complement planet transits
D. Stello, H. Kjeldsen, T. R. Bedding
The study of stellar oscillations - asteroseismology - has revolutionized our understanding of the physical properties of the Sun, and similar potential for other stars has been de…
Multisite campaign on the open cluster M67. II. Evidence for solar-like oscillations in red giant stars
D. Stello, H. Bruntt, H. Kjeldsen +19
Measuring solar-like oscillations in an ensemble of stars in a cluster, holds promise for testing stellar structure and evolution more stringently than just fitting parameters to s…
Multi-site campaign on the open cluster M67. I. Observations and photometric reductions
D. Stello, T. Arentoft, T. R. Bedding +18
We report on an ambitious multi-site campaign aimed at detecting stellar variability, particularly solar-like oscillations, in the red giant stars in the open cluster M67 (NGC 2682…
Bayesian Inference from Observations of Solar-Like Oscillations
Brendon J. Brewer, Timothy R. Bedding, Hans Kjeldsen +1
Stellar oscillations can provide a wealth of information about a star, which can be extracted from observed time series of the star's brightness or radial velocity. In this paper w…
Oscillation mode lifetimes in ksi Hydrae: Will strong mode damping limit asteroseismology of red giant stars?
D. Stello, H. Kjeldsen, T. R. Bedding +1
We introduce a new method to measure frequency separations and mode lifetimes of stochastically excited and damped oscillations, so-called solar-like oscillations. Our method shows…
Do red giants have short mode lifetimes?
D. Stello, H. Kjeldsen, T. R. Bedding +1
We show evidence that the red giant star ksi Hya has an oscillation mode lifetime, tau, of about 2 days significantly shorter than predicted by theory (tau = 17 days, Houdek & Goug…
Simulating stochastically excited oscillations. The mode lifetime of xi Hya
D. Stello, H. Kjeldsen, T. R. Bedding +5
The discovery of solar-like oscillations in the giant star xy Hya (G7III) was reported by Frandsen et al. (2002). Their frequency analysis was very limited due to alias problems in…
Time-series Spectroscopy of Pulsating sdB Stars II: Velocity Analysis of PG1605+072
S. J. O'Toole, T. R. Bedding, H. Kjeldsen +2
We present the analysis of time-resolved spectroscopy of the pulsating sdB star PG1605+072. From our main observing run of 16 nights we have detected velocity variations at 5 frequ…
The problem of the Pleiades distance. Constraints from Stromgren photometry of nearby field stars
Dennis Stello, Poul Erik Nissen
The discrepancy between the Pleiades cluster distance based on Hipparcos parallaxes and main sequence fitting is investigated on the basis of Stromgren photometry of F-type stars.…