Zobrazeno 1 - 10
of 70
pro vyhledávání: '"B.R. Pettersen"'
Proceedings of the Midnight Sun Conference, held in Tromsø, Norway, July 1-8, 1987
Kniha
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Autor:
B.R. Pettersen
Publikováno v:
Symposium - International Astronomical Union. 137:49-52
Current stellar models predict fully convective structures for masses less than about 0.3 Mo. We have monitored low luminosity dMe and dM stars for flare activity with the 2.1 m telescope at McDonald Observatory. The dMe stars produced 2-5 detectable
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83baee698d800d2bb30e85e13b228a43
https://doi.org/10.1017/s0074180900187418
https://doi.org/10.1017/s0074180900187418
Autor:
B.R. Pettersen, K.P. Panov, M.S. Ivanova, C.W. Ambruster, E. Valtaoja, L. Valtaoja, S. Avgoloupis, L.N. Mavridis, J.H. Seiradakis, S.R. Sundland, K. Olah, O. Havnes, Ø. Olsen, J.-E Solheim, T. Aanesen
Publikováno v:
Symposium - International Astronomical Union. 137:15-18
Time resolved U-filter lightcurves of stellar flares on the dM4e star AD Leo have been measured to determine the flare frequency for individual observing seasons between 1972 and 1988. This report adds new data for 1984-1988. We use the number of fla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::159bdf99cc751b53cc8c39dcf6939508
https://doi.org/10.1017/s0074180900187315
https://doi.org/10.1017/s0074180900187315
Publikováno v:
International Astronomical Union Colloquium. 130:378-380
New starspot photometry of BY Dra and EV Lac, extending over a decade is analyzed in combination with data from the literature to study the long-term behaviour of spottedness on these stars. Both stars show brightness suppression as well as brightnes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7820a7e99026ce248f16fb3e8e62fbe5
https://doi.org/10.1017/s0252921100079951
https://doi.org/10.1017/s0252921100079951
Akademický článek
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Akademický článek
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Autor:
B.R. Pettersen
Publikováno v:
International Astronomical Union Colloquium. 71:17-33
Physical parameters (temperature, luminosity, radius, mass and chemical abundance) of the photospheres of red dwarf flare stars and spotted stars are determined for quiescent conditions. The interrelations between these quantities are compared to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ad609933e7f1cba3e07fefc77e39617
https://doi.org/10.1017/s0252921100095907
https://doi.org/10.1017/s0252921100095907
Autor:
B.R. Pettersen
Publikováno v:
International Astronomical Union Colloquium. 71:239-243
Light curves of major stellar flares have been used to study the behavior of U-B, B-V, and V-R. The majority of the flux transmitted through these filters is continuum radiation, but U and B are affected by emission lines. The variability of Ha and H
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f36dacf9a64affb5e17a5859156bb92e
https://doi.org/10.1017/s0252921100096159
https://doi.org/10.1017/s0252921100096159
Autor:
K.E. Egge, B.R. Pettersen
Publikováno v:
International Astronomical Union Colloquium. 71:481-483
Almost twenty years ago a large flare event was observed on the prototype contact binary W UMa by Kuhi (1964). Similar events have been reported on 44 i Boo (Eggen 1948) and U Peg (Huruhata 1952) . In this paper we present photoelectric observations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c8eebe5334e383b4988a744de52161f
https://doi.org/10.1017/s0252921100096536
https://doi.org/10.1017/s0252921100096536