Zobrazeno 1 - 10
of 17
pro vyhledávání: '"J. O. Petersen"'
Autor:
L. M. Freyhammer, M. Monelli, G. Bono, P. Cunti, I. Ferraro, A. Calamida, S. Degl’Innocenti, P. G. Prada Moroni, M. Del Principe, A. Piersimoni, G. Iannicola, P. B. Stetson, M. I. Andersen, R. Buonanno, C. E. Corsi, M. Dall’Ora, J. O. Petersen, L. Pulone, C. Sterken, J. Storm
Publikováno v:
The Astrophysical Journal. 623:860-865
We present three different optical and near-infrared (NIR) data sets for evolved stars in the Galactic Globular Cluster Omega Cen The comparison between observations and homogeneous sets of stellar isochrones and Zero-Age Horizontal Branches provides
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c432ac3c60125f7ba712e382ec05ce8
https://doi.org/10.1086/428643
https://doi.org/10.1086/428643
Autor:
J. O. Petersen, G. K. Andreasen
Publikováno v:
Stellar Pulsation ISBN: 9783540176688
For the g a l a c t i c Cepheids Simon and Lee (1981) gave a successful , q u a n t i t a t i v e descript ion of the Her t z sp rung sequence by means of Fourier decomposi t ion pa rame te r s . They found a sys temat ic va r i a t i on wi th per io
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50bb4e2c7ae20a677b3349e9ced5bbf3
https://doi.org/10.1007/3-540-17668-3_204
https://doi.org/10.1007/3-540-17668-3_204
Autor:
J. O. Petersen
Publikováno v:
Astrophysics and Space Science. 210:153-155
The discrepancies between observed and theoretically calculated period ratios of the double mode, classical Cepheids and other groups of Cepheid type variables have played a prominent role in investigations of the important physical characteristics o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d45bf14525c6505f11fc4f83a371b4a
https://doi.org/10.1007/bf00657887
https://doi.org/10.1007/bf00657887
Very recently the MACHO Collaboration published detailed data for 45 double-mode Cepheids in the Large Magellanic Cloud. Here we compare these data with new stellar pulsation models. We conclude that the new period ratios are in good agreement with a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bdbde74e21e04da09ea4b1213c8e3530
http://cds.cern.ch/record/300673
http://cds.cern.ch/record/300673
Autor:
J. O. Petersen
Publikováno v:
Nonlinear Phenomena in Stellar Variability ISBN: 9789401044622
The application of Fourier decomposition parameters has revolutionized important areas of investigations of Cepheid type variables since the introduction of Fourier analysis in its modern form by Simon and Lee (1981).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8faea15e56c2b19f315f596143a32ae7
https://doi.org/10.1007/978-94-011-1062-4_20
https://doi.org/10.1007/978-94-011-1062-4_20
Publikováno v:
International Astronomical Union Colloquium. 176:497-498
Based on new analyses of light curves of SX Phœnicis variables in globular clusters and on results taken from the literature, an overview of oscillation patterns in this subgroup of δ Scuti variables is given. Belonging to the Blue Straggler stars,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bbad1911b8466c1407c7e55f11c0b34
https://doi.org/10.1017/s0252921100058620
https://doi.org/10.1017/s0252921100058620
Publikováno v:
International Astronomical Union Colloquium. 176:252-253
Preliminary results are reported for a monitoring program on ω Cen. We search for multi-mode SX Phe stars and changes in pulsation parameters of the cluster variables in order to test models of stellar evolution. With a periodogram for 10,000 light
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13d123ccd865d8ec664ad6431fb9251d
https://doi.org/10.1017/s0252921100057717
https://doi.org/10.1017/s0252921100057717
Autor:
J. O. Petersen, M. Andersen
Publikováno v:
International Astronomical Union Colloquium. 155:389-390
The distribution of the RR Lyrae stars in the globular cluster ω Centauri is studied, using the data published by Martin in 1938. Comparing the accumulated numbers of variables within the angular distance, r, from the centre of the cluster, it is sh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a3aa3db5bd927e0c2d67523d9a050a9
https://doi.org/10.1017/s0252921100037647
https://doi.org/10.1017/s0252921100037647
Autor:
J. O. Petersen, G. Jancso, H. B. Jensen, P.S.L. Booth, J. A. J. Skard, P. Villeneuve, Göran Jarlskog, X. De Bouard, S. Ø. Nielsen, E. Lillethun, H. Bøggild, H. E. Miettinen, L.J. Carroll, B. Guillerminet, E. Lohse, Leif J. Jönsson, J. E. Hooper, R. Møller, J. V. Morris, D. B. Smith, A. Klovning, A. Lu, M. Davidson, S. Almehed, B. Lörnstad, N. A. McCubbin, P. Catz, E. Dahl-Jensen, K. H. Hansen, G. Damgaard, P. Herbsleb, Michael Albrow, N. Elverhaug, J. N. Jackson, I. Dahl-Jensen, G. von Dardel
Publikováno v:
Nuclear Physics B. 135:461-485
In the course of an experiment to investigate the structure of final states from high-energy proton-proton collisions containing an identified charged hadron of high transverse momentum near 90° in the c.m.s., we have studied correlations between th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::164c2bbaf626179a2877e498fc43cd61
https://doi.org/10.1016/0550-3213(78)90349-8
https://doi.org/10.1016/0550-3213(78)90349-8
Autor:
J. O. Petersen, L. Hansen
Publikováno v:
International Astronomical Union Colloquium. 82:272-275
UBVRI light curves are obtained for the two halo RR Lyrae variables U Caeli with period 0.420 days (73 observations) and V Caeli with period 0.571 days (42 observations). It is shown that their light curve characteristics are very similar to those of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7be56e8de3239743946587a4e9954e96
https://doi.org/10.1017/s0252921100109509
https://doi.org/10.1017/s0252921100109509