Jørgen Otzen Petersen

Personal data: 

     Name: Jørgen Otzen Petersen
    Title: associate professor (danish "lektor")

    Email: oz@astro.ku.dk
      Fax: +45 3532 5989
    Phone: +45 3532 5994
Secretary: +45 3532 5999

Job description:

My main research interests are stellar evolution and stellar pulsation. Two older papers are: "Studies of Cepheid-type variability XI. Are some BL Herculis variables overtone pulsators ?" in Astron. Astrophys. 272, 217 (1993), "The RR Lyrae stars of omega Centauri revisited I. Catalogue of Fourier decomposition parameters" in Astron. Astrophys. Suppl. 105, 145 (1994). Two papers for IAU Coll. 155 (ASP Conf. Ser. 83, 1995) are included here: Petersen, J.O. and Christensen-Dalsgaard J. 1995: "Models of the double-mode Cepheids in the Large Magellanic Cloud", and Petersen, J.O. and Andersen, M. 1995: "The distribution of the RR Lyrae variables in omega Centauri and background light".
March 2001 the following is available:
Internal report: J.O. Petersen "Selected Stellar Model Evolution Sequences and Model Series: Update 1999 of Earlier Plots Based on Models With Old Opacities".
Paper from: The First MONS Workshop: Science with a Small Space Telescope, eds. H. Kjeldsen, T.R. Bedding, Aarhus Univ., 119-125, (1998), J.O. Petersen: "MONS and high-amplitude Delta Scuti stars".
Poster for: The Third MONS Workshop on MONS Science Preparation and Target Selection, 24-26 Jan. 2000, TAC, Aarhus University, Denmark, J.V. Clausen, J.O. Petersen and M.I. Andersen: "High-Amplitude Pulsation Variable Stars and Eclipsing Binaries as MONS Targets".
Papers on distances of Delta Scuti stars:

From: Views on Distance Indicators, eds. M. Arnaboldi, F. Caputo, A. Rifatto, Memorie della Soc. Astron. Italiana 69, 59-68, (1998), J.O. Petersen and E. Høg: "Hipparcos parallaxes and distances of high-amplitude Delta Scuti stars".

Astron. and Astrophys. 331, 989 (1998), J.O. Petersen and E. Høg: "Hipparcos parallaxes and period-luminosity relations of high-amplitude Delta Scuti stars".

From: Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era, eds. D. Egret, A. Heck, ASP Conf. Ser. 167, 107-112 (1999), J.O. Petersen: "Delta Scuti Variables as Precise Distance Indicators".

Astron. and Astrophys. 352, 547-554 (1999): J.O. Petersen and J. Christensen-Dalsgaard: "Pulsation models of Delta Scuti variables II. Delta Scuti stars as precise distance indicators".

Report from Astronomical Observatory, NBIfAPG, Copenhagen University 1999/2001: J.O. Petersen: "Pulsation models of Delta Scuti variables III. Delta Scuti stars as precise distance indicators: SUMMARY POP. I & II and tables and figures for population II".

Papers on SX Phoenicis variables in globular clusters:

From: A Half Century of Stellar Pulsation Interpretations: A Tribute to Arthur N. Cox, eds. P.A. Bradly, J.A. Guzik, ASP Conf. Ser. 135, 458 (1998), L.M. Freyhammer, M.I. Andersen, J.O. Petersen 1998: " Variable Stars in the Globular Cluster Omega Centauri: Multimode Variability of SX Phoenicis Stars in the Central Region".

From: 6th Vienna Workshop in Astrophysics, eds. M. Breger, M. Montgomery, to be printed in ASP Conf. Ser. (2000), J.O. Petersen, M. Quaade, L.M. Freyhammer, M.I. Andersen 2000: " Double-mode SX Phoenicis variables in globular clusters".

Poster to IAU Coll. 185 in Leuven, Belgium, July 2001, J.O. Petersen, L.M. Freyhammer 2001: " Using SX Phoenicis variables in M55 and theoretical period-luminosity(-colour-metallicity) relations for distance determination".

Until 1999 my teaching was mainly a course for 2nd y students, giving a survey of general astrophysics (called "Astronomi 211") and a 5 weeks project course for graduate studens, where each participant write a Fortran program that can calculate a very simple stellar model. From Oct. 1999 I am retired from the Copenhagen University.
Last updated 18 July 2001 by Jørgen Otzen Petersen, oz@astro.ku.dk.