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Time-series Spectroscopy of Pulsating sdB stars III: Line Indices of PG1605+072
S. J. O'Toole, M. A. S. G. Joergensen, H. Kjeldsen +3
We present the detection and analysis of line index variations in the pulsating sdB star PG 1605+072. We have found a strong dependence of line index amplitude on Balmer line order…
A 6.3-h superhump in the cataclysmic variable TV Columbae: the longest yet seen
A. Retter, C. Hellier, T. Augusteijn +5
We present results from a two week multi-longitude photometric campaign on TV Col held in 2001 January. The data confirm the presence of a permanent positive superhump found in re-…
Time-resolved spectroscopy and spectrophotometry of the pulsating sdB star PG 1605+072
S. J. O'Toole, T. R. Bedding, H. Kjeldsen +1
We present the latest results from our analysis of time resolved spectroscopy of PG 1605+072, a high amplitude pulsating sdB star. The star is believed to have evolved off the extr…
Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign
D. Garcia-Alvarez, B. H. Foing, D. Montes +2
We present simultaneous and continuous observations of the H, H, He {\sc i} D, Na {\sc i} D,D doublet and the Ca {\sc ii} H & K lines for the RS CVn system…
Solar-like oscillations in semiregular variables
Timothy R. Bedding
Power spectra of the light curves of semiregular variables, based on visual magnitude estimates spanning many decades, show clear evidence for stochastic excitation. This supports…
Oscillations in alpha Cen A observed with UCLES at the AAT
T. R. Bedding, R. P. Butler, C. McCarthy +5
We report Doppler measurements of alpha Cen A from time-series spectroscopy made with UCLES at the 3.9-m AAT. Wavelength calibration using an iodine absorption cell produced high-p…
Evidence for Solar-like Oscillations in Arcturus (Alpha Boo)
Alon Retter, Timothy R. Bedding, Derek Buzasi +1
Observations of the red giant Arcturus (Alpha Boo) obtained with the star tracker on the Wide Field Infrared Explorer (WIRE) satellite during a baseline of 19 successive days in 20…
The light curve of the semiregular variable L2 Puppis: I. A recent dimming event from dust
T. R. Bedding, A. A. Zijlstra, A. Jones +5
The nearby Mira-like variable L2 Pup is shown to be undergoing an unprecedented dimming episode. The stability of the period rules out intrinsic changes to the star, leaving dust f…
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 evolution of the Mira variable R Hydrae
Albert A. Zijlstra, T. R. Bedding, J. A. Mattei
The Mira variable R Hydrae is well known for its declining period, which Wood & Zarro (1981) attributed to a possible recent thermal pulse. Here we investigate the long-term period…
The extended atmosphere and evolution of the RV Tau star R Scuti
M. Matsuura, I. Yamamura, A. A. Zijlstra +1
We analyze ISO/SWS spectra of the RV Tau star R Scuti. The infrared spectra are dominated by H2O emission bands. The near- and mid-infrared excess is attributed to H2O; the dust co…
Confirmation of Solar-Like Oscillations in eta Bootis
H. Kjeldsen, T. R. Bedding, I. K. Baldry +9
We report observations of the G0 subgiant eta Boo made in 1998, in Balmer-line equivalent width with the 2.5-m Nordic Optical Telescope and in velocity with the 24-inch Lick CAT. I…
Solar-Like Oscillations in beta Hydri: Evidence for Short-Lived High-Amplitude Oscillations
T. R. Bedding, H. Kjeldsen, I. K. Baldry +7
Velocity measurements of the G2 subgiant beta Hyi with both UCLES and CORALIE show a clear excess of power centred at 1.0 mHz. In the UCLES data we find evidence for a short-lived,…