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Massive B-type pulsators in low-metallicity environments
C. Karoff, T. Arentoft, L. Glowienka +5
Massive B type pulsators such as beta Cep and slowly pulsating B (SPB) stars pulsate due to layers of increased opacity caused by partial ionization. The increased opacity blocks t…
A multi-site campaign to measure solar-like oscillations in Procyon. I. Observations, Data Reduction and Slow Variations
Torben Arentoft, Hans Kjeldsen, Timothy R. Bedding +45
We have carried out a multi-site campaign to measure oscillations in the F5 star Procyon A. We obtained high-precision velocity observations over more than three weeks with eleven…
The amplitude of solar oscillations using stellar techniques
Hans Kjeldsen, Timothy R. Bedding, Torben Arentoft +6
The amplitudes of solar-like oscillations depend on the excitation and damping, both of which are controlled by convection. Comparing observations with theory should therefore impr…
AsteroFLAG: first results from hare-and-hounds Exercise 1
W. J. Chaplin, T. Appourchaux, T. Arentoft +15
We report on initial results from the first phase of Exercise 1 of the asteroFLAG hare and hounds. The asteroFLAG group is helping to prepare for the asteroseismology component of…
SPB stars in the open SMC cluster NGC 371
C. Karoff, T. Arentoft, L. Glowienka +5
Pulsation in beta Cep and SPB stars are driven by the kappa mechanism which depends critically on the metallicity. It has therefore been suggested that beta Cep and SPB stars shoul…
Oscillations in Procyon A: First results from a multi-site campaign
S. Hekker, T. Arentoft, H. Kjeldsen +45
Procyon A is a bright F5IV star in a binary system. Although the distance, mass and angular diameter of this star are all known with high precision, the exact evolutionary state is…
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…
VSOP: The Variable Star One-shot Project I. Project presentation and first data release
T. H. Dall, C. Foellmi, J. Pritchard +21
The Variable Star One-shot Project (VSOP) is aimed at (1) providing the variability type and spectral type of all unstudied variable stars, (2) process, publish, and make the data…
The Variable Star One-shot Project, and its little child: Wikimbad
C. Foellmi, T. H. Dall, J. Pritchard +21
The Variable Star One-shot Project (VSOP) aimed at providing to the world-wide stellar community the necessary one-shot spectrum of unstudied variable stars, too often classified a…
Stellar Oscillations Network Group
F. Grundahl, H. Kjeldsen, J. Christensen-Dalsgaard +2
Stellar Oscillations Network Group (SONG) is an initiative aimed at designing and building a network of 1m-class telescopes dedicated to asteroseismology and planet hunting. SONG w…
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…
Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
T. Arentoft, J. De Ridder, F. Grundahl +9
This is the first step in a project to combine studies of eclipsing binaries and oscillating stars to probe the interior of Blue Stragglers (BS). This may imply a way to discrimina…
Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations
Timothy R. Bedding, Hans Kjeldsen, Torben Arentoft +16
We have observed oscillations in the nearby G2 subgiant star beta Hyi using high-precision velocity observations obtained over more than a week with the HARPS and UCLES spectrograp…
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,…
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…
Asteroseismology with the Kepler mission
J. Christensen-Dalsgaard, T. Arentoft, T. M. Brown +4
NASA's Kepler mission will fly a photometer based on a wide-field Schmidt camera with a 0.95 m aperture, staring at a single field continuously for at least 4 years. Although the m…
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…
Bisectors of the cross-correlation function applied to stellar spectra. Discriminating stellar activity, oscillations and planets
T. H. Dall, N. C. Santos, T. Arentoft +2
Aims: We investigate whether bisectors derived from cross-correlation functions (CCF) of single-exposure spectra can be used to provide information on stellar atmospheres, and whet…
A Photometric Study of the Light Variations of the Triple System DG Leonis
P. Lampens, Y. Frémat, R. Garrido +8
Multi-site and multi-year differential photometry of the triple star DG Leo reveals a complex frequency spectrum that can be modelled as the combination of at least three Delta Scu…
The rise and fall of V4334 Sgr (Sakurai's Object)
H. W. Duerbeck, W. Liller, C. Sterken +10
CCD UBVRi photometry of the final helium flash object V4334 Sgr (Sakurai's Object), carried out during 1997 - 1999, is presented, and the light curve from its pre-discovery rise to…