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9 results on '"J. E. Solheim"'

1. Near Continuous Photometry with the Whole Earth Telescope (WET)

Author

J. E. Solheim

Subjects
Physics, observational stars, Astronomy, variables, Astrophysics::Instrumentation and Methods for Astrophysics, White dwarf, Astronomy and Astrophysics, QB1-991, Astrophysics, Methods observational, Physics::History of Physics, law.invention, methods, Telescope, Photometry (astronomy), Space and Planetary Science, law, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, fundamental parameters, white dwarfs
Abstract

The Whole Earth Telescope (WET) saw first light in 1988. It was invented by scientists from the Astronomy Department, University of Texas at Austin. The idea was to generate a world-wide network of cooperating astronomical observatories to obtain uninterrupted time-series measurements of some variable stars. The technological goal was to resolve the multi-periodic oscillations in these objects into their individual components; the scientific goal was to construct accurate theoretical models of the target objects, constrained by their observed behavior, from which fundamental astrophysical parameters could be derived. This approach has been extremely successful, and has placed stellar seismology at the forefront of stellar astrophysics. The network is run as a single astronomical instrument with many operators, and the collaboration includes scientists from all continents on our planet, taking part in the observations, data reduction, analysis and theoretical interpretation. The expertise of Lithuanian astronomers in photometry, and their access to the observing station Mt. Maidanak in Uzbekistan, has been important for the success of the network.

Published
2003

2. On the Quality of WET Time

Author

D. J. Sullivan and J. E. Solheim

Subjects
Physics, instrumentation, media_common.quotation_subject, Astronomy, Real-time computing, synchronisation, Astronomy and Astrophysics, QB1-991, timing accuracy, continuous photometry, Space and Planetary Science, Synchronization (computer science), Quality (business), media_common
Abstract

The goal of the WET collaboration is to produce a photometric light curve as continuous and accurate as possible, given the weather and technical constraints. In order to join light curves from different observers, it is important that all observer’s clocks are accurately synchronised with Universal Time, and with a precision substantially better than one second. This requires vigilance and careful checking by the observer, who needs to be familiar with the instrument and how the integration intervals are determined. This is in particular important with the introduction of the more complex CCD photometers. Ideally each observer should have access to their own time source, and a GPS solution is recommended. It is also important that the information about timing peculiarities are carefully checked and recorded and passed on to the data analysts.

Published
2003

3. Wet Observations of GD 358 in 2000

Author

J. E. Solheim, T. Sullivan, Paul A. Bradley, J. M. Gonzalez Perez, E. G. Meištas, Encarni Romero-Colmenero, E. W. Klumpe, Thorsten Nagel, G. Vauclair, Stefan Dreizler, Waldemar Ogloza, J. Xiaojun, P. Martinez, F. Johannessen, M. Chevreton, Antonio Kanaan, Matt A. Wood, Sonja Schuh, Martha L. Boyer, Nicole M. Silvestri, J. N. Fu, A. Ulla, Donald E Winget, Kazuhiro Sekiguchi, Staszek Zola, Denis J. Sullivan, T. S. Metcalfe, Jam Shaw, R. L. Riddle, Atsuko Nitta, E. R. Nather, J. L. Deetjen, Donal O'Donoghue, Souza Oliveira Kepler, A. F. Murillo Costa, S. D. Kawaler, J. E. S. Costa, Anjum S. Mukadam, J. Larrison, T. J. Ahrens, A. Kyle Jones, J. KrzesiŃski, S. J. Kleinman, R. Kalytis, R. Janulis, and A. E. Collins

Subjects
Physics, stars, lcsh:QB1-991, Stars, Space and Planetary Science, lcsh:Astronomy, evolution, Astronomy, Astronomy and Astrophysics, individual, GD 358 - stars, Astrobiology
Abstract

We report on the 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23 to June 8, 2000. We acquired more than 232 000 independent measurements and detected the non-radial g-modes consistent with degree ℓ = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude ℓ = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order.

Published
2003

4. Preliminary Results from XCOV 17: PG 1336-018

Author

T. S. Metcalfe, Jérôme Perez, G. Vauclair, R. H. Østensen, E. G. Meištas, B. Shobbrook, B. N. Ashoka, H. Mendelson, Steven D. Kawaler, Matthew R. Burleigh, Stefan Dreizler, Waldemar Ogloza, Adalberto Piccioni, Denis J. Sullivan, F. van Wyk, R. Kalytis, Freddy Marang, J. Krzesinski, R. S. Stobie, O. Giovannini, J. L. Deetjen, Anjum S. Mukadam, A. Nitta-Kleinman, S. Seetha, T. K. Watson, S. J. Kleinman, P. Martinez, P. Mosaklik, Michael D. Reed, Sonja Schuh, Ana Ulla, D. O'Donoghue, M. Chevreton, Staszek Zola, D. Ališauskas, Antonio Kanaan, Martin A. Barstow, Judith L. Provencal, T. Sullivan, Roberto Silvotti, J. E. Solheim, Souza Oliveira Kepler, Olga Suarez, P. Ibbetson, J. Rene-Fremy, D. Kilkenny, Elia M. Leibowitz, Xiao-Jun Jiang, N. Dolez, and Minia Manteiga

Subjects
Physics, Space and Planetary Science, Astronomy, Astronomy and Astrophysics, QB1-991, Astrobiology
Published
2000

5. Asteroseismology of RXJ 2117+3412

Author

Donald E Winget, E. G. Meištas, J. Krzesinski, A. V. Chernyshev, T. Matzeh, J. E. Solheim, G. Vauclair, Judith L. Provencal, B. N. Ashoka, S. J. Kleinman, T. M. K. Marar, N. Dolez, J. C. Clemens, Antonio Kanaan, Anne E. Sansom, Pawel Moskalik, B. Pfeiffer, R. E. Nather, Souza Oliveira Kepler, Paul A. Bradley, Juan Antonio Belmonte, Staszek Zola, B. Serre, M. Chevreton, Elia M. Leibowitz, Martin A. Barstow, T. K. Watson, Albert D. Grauer, G. Pajdosz, and Jian Shi Yang

Subjects
Physics, Space and Planetary Science, Astronomy, Astronomy and Astrophysics, QB1-991, Asteroseismology
Published
1998

6. Observations of modulation amplitude colors in AM CVn

Author

Christophe Massacand and J. E. Solheim

Subjects
Physics, Optics, Amplitude, Space and Planetary Science, business.industry, Modulation, Astronomy, Astronomy and Astrophysics, QB1-991, Astrophysics, business
Published
1995

7. Study of periodicities of the DAV white dwarf G 117-B15A with the Whole Earth Telescope

Author

Gilles Fontaine, Elia M. Leibowitz, Pierre Bergeron, B. N. Ashoka, R. E. Nather, Don Winget, S. Seetha, T. M. K. Marar, D. Dolez, J. E. Solheim, R. W. Tweedy, Albert D. Grauer, Matt A. Wood, F. Wesemael, B. P. Hine, J. C. Clemens, Antonio Kanaan, Chuck Claver, S. J. Kleinman, P. I. Emanuelsen, Tsevi Mazeh, Edward L. Robinson, G. Vauclair, Anne E. Sansom, Paul A. Bradley, M. Chevreton, Martin A. Barstow, Souza Oliveira Kepler, and Judith L. Provencal

Subjects
Telescope, Physics, Space and Planetary Science, law, Astronomy, White dwarf, Astronomy and Astrophysics, QB1-991, Astrophysics, Earth (classical element), law.invention
Published
1995

8. Multisite observations of the DAV white dwarf R 548

Author

B. N. Ashoka, Dayal Wickramasinghe, S. J. Kleinman, V. Kardapolov, D. A. H. Buckley, P. Birch, E. G. Meištas, Don Winget, Souza Oliveira Kepler, Raymundo Baptista, P. I. Emanuelsen, Carole A. Haswell, T. M. K. Marar, J. E. Solheim, O. Olsen, V. Tereshchenko, Denis J. Sullivan, D. Neill, Brian Warner, Antonio Kanaan, R. E. Nather, K. Wu, H. S. Mahra, M. S. Bessell, F. K. Rspaev, O. Giovannini, A. F. M. Costa, and D. O'Donoghue

Subjects
Physics, symbols.namesake, Fourier transform, Space and Planetary Science, Astronomy, Multi site, symbols, White dwarf, Astronomy and Astrophysics, QB1-991, Astrophysics
Abstract

The pulsating DA white dwarf R 548 was observed for 46 h in October 1993 in an eight-site campaign. New peaks near the known doublets in the Fourier transform are found.

Published
1995

9. The WET from outside Texas

Author

J. E. Solheim

Subjects
Physics, Space and Planetary Science, Astronomy, Astronomy and Astrophysics, QB1-991, Archaeology
Published
1993

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