Hans Bruntt | Aarhus University (original) (raw)
Address: Aarhus, Midtjylland, Denmark
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Papers by Hans Bruntt
Master Thesis Institute of Physics and Astronomy Aarhus University, 1999
ABSTRACT Following the failure of the main experiment on board the Wide-Field Infrared Explorer s... more ABSTRACT Following the failure of the main experiment on board the Wide-Field Infrared Explorer satellite (WIRE), the on-board star camera was used as the first space-based asteroseismology experiment. From May 1999 through November 2006, well over 200 targets were observed for periods ranging up to 40+ days. The typical noise level (measured at a frequency of 10 mHz) of these observations was
Bulletin of the American Astronomical Society, Dec 1, 2004
WIRE observations of K giants (e.g., alpha Boo, Retter et al. 2004) have revealed the presence of... more WIRE observations of K giants (e.g., alpha Boo, Retter et al. 2004) have revealed the presence of low-level variability in some K giants which is at least quasi-periodic, and which is suggestive of p-mode oscillations. In 2004 (Preston, Bruntt and Buzasi, Cool Stars 13), we presented new WIRE oscillation data for five K giants, some of which were strongly periodic.
Astron Astrophys Suppl Series, 1999
ABSTRACT
Astronomy and Astrophysics, Apr 18, 1998
Bulletin of the American Astronomical Society, Dec 1, 2004
ABSTRACT The WIRE satellite has observed the F-type star Procyon for two periods during 1999 and ... more ABSTRACT The WIRE satellite has observed the F-type star Procyon for two periods during 1999 and 2000. The two data sets consist of time series of 10 days length with a cadence of 0.5 seconds and a duty cycle of 15 than the Sun and thus [the photometric signal arising from] granulation is expected to have higher amplitude. We have used the two WIRE data sets to put an upper limit on the granulation and find this to be close to a factor of two times the amplitude seen in the Sun. This limit is lower than the factor [of] five proposed by observations with the Canadian MOST mission (Matthews et al. 2004). Due to the rather low duty cycle in the WIRE data set we are not able to confirm the oscillations seen in Procyon from radial velocity measurements (Martic et al. 2004).
Vizier Online Data Catalog, Jun 1, 1999
The Astronomical Journal, 2016
Proceedings of the International Astronomical Union, 2009
We combine results from interferometry, asteroseismology and spectroscopic analyses to determine ... more We combine results from interferometry, asteroseismology and spectroscopic analyses to determine accurate fundamental parameters (mass, radius and effective temperature) of 10 bright solar-type stars covering the H-R diagram from spectral type F5 to K1. Using “direct” techniques that are only weakly model-dependent we determine the mass, radius and effective temperature. We demonstrate that model-dependent or “indirect” methods can be reliably used even for relatively faint single stars for which direct methods are not applicable. This is important for the characterization of the targets of the CoRoT and Kepler space missions.
Proceedings of the International Astronomical Union
Proceedings of The International Astronomical Union, 2003
Proceedings of the International Astronomical Union, 2006
The fundamental properties of detached eclipsing binary stars can be measured very accurately, wh... more The fundamental properties of detached eclipsing binary stars can be measured very accurately, which could make them important objects for constraining the treatment of convection in theoretical stellar models. However, only four or five pieces of information can be found for the average system, which is not enough. We discuss studies of more interesting and useful objects: eclipsing binaries in clusters and eclipsing binaries with pulsating components.
Master Thesis Institute of Physics and Astronomy Aarhus University, 1999
ABSTRACT Following the failure of the main experiment on board the Wide-Field Infrared Explorer s... more ABSTRACT Following the failure of the main experiment on board the Wide-Field Infrared Explorer satellite (WIRE), the on-board star camera was used as the first space-based asteroseismology experiment. From May 1999 through November 2006, well over 200 targets were observed for periods ranging up to 40+ days. The typical noise level (measured at a frequency of 10 mHz) of these observations was
Bulletin of the American Astronomical Society, Dec 1, 2004
WIRE observations of K giants (e.g., alpha Boo, Retter et al. 2004) have revealed the presence of... more WIRE observations of K giants (e.g., alpha Boo, Retter et al. 2004) have revealed the presence of low-level variability in some K giants which is at least quasi-periodic, and which is suggestive of p-mode oscillations. In 2004 (Preston, Bruntt and Buzasi, Cool Stars 13), we presented new WIRE oscillation data for five K giants, some of which were strongly periodic.
Astron Astrophys Suppl Series, 1999
ABSTRACT
Astronomy and Astrophysics, Apr 18, 1998
Bulletin of the American Astronomical Society, Dec 1, 2004
ABSTRACT The WIRE satellite has observed the F-type star Procyon for two periods during 1999 and ... more ABSTRACT The WIRE satellite has observed the F-type star Procyon for two periods during 1999 and 2000. The two data sets consist of time series of 10 days length with a cadence of 0.5 seconds and a duty cycle of 15 than the Sun and thus [the photometric signal arising from] granulation is expected to have higher amplitude. We have used the two WIRE data sets to put an upper limit on the granulation and find this to be close to a factor of two times the amplitude seen in the Sun. This limit is lower than the factor [of] five proposed by observations with the Canadian MOST mission (Matthews et al. 2004). Due to the rather low duty cycle in the WIRE data set we are not able to confirm the oscillations seen in Procyon from radial velocity measurements (Martic et al. 2004).
Vizier Online Data Catalog, Jun 1, 1999
The Astronomical Journal, 2016
Proceedings of the International Astronomical Union, 2009
We combine results from interferometry, asteroseismology and spectroscopic analyses to determine ... more We combine results from interferometry, asteroseismology and spectroscopic analyses to determine accurate fundamental parameters (mass, radius and effective temperature) of 10 bright solar-type stars covering the H-R diagram from spectral type F5 to K1. Using “direct” techniques that are only weakly model-dependent we determine the mass, radius and effective temperature. We demonstrate that model-dependent or “indirect” methods can be reliably used even for relatively faint single stars for which direct methods are not applicable. This is important for the characterization of the targets of the CoRoT and Kepler space missions.
Proceedings of the International Astronomical Union
Proceedings of The International Astronomical Union, 2003
Proceedings of the International Astronomical Union, 2006
The fundamental properties of detached eclipsing binary stars can be measured very accurately, wh... more The fundamental properties of detached eclipsing binary stars can be measured very accurately, which could make them important objects for constraining the treatment of convection in theoretical stellar models. However, only four or five pieces of information can be found for the average system, which is not enough. We discuss studies of more interesting and useful objects: eclipsing binaries in clusters and eclipsing binaries with pulsating components.