K
K. Topka
Researcher at Harvard University
Publications - 15
Citations - 1075
K. Topka is an academic researcher from Harvard University. The author has contributed to research in topics: Luminosity & Stars. The author has an hindex of 10, co-authored 15 publications receiving 1037 citations.
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Journal ArticleDOI
The Einstein /HEAO 2/ X-ray Observatory
Riccardo Giacconi,G. Branduardi,Ulrich G. Briel,A. Epstein,Daniel G. Fabricant,E. D. Feigelson,William R. Forman,Paul Gorenstein,J. E. Grindlay,H. Gursky,F. R. Harnden,J. P. Henry,C. Jones,E. M. Kellogg,D. Koch,S. S. Murray,Ethan J. Schreier,F. D. Seward,Harvey Tananbaum,K. Topka,L. van Speybroeck,Stephen S. Holt,Robert H. Becker,Elihu Boldt,Peter J. Serlemitsos,George W. Clark,Claude R. Canizares,Thomas H. Markert,Robert Novick,D. J. Helfand,Knox S. Long +30 more
TL;DR: The Einstein X-ray Observatory (HEAO 2) as mentioned in this paper is a fully imaging focusing Xray telescope with an angular resolution of a few arc sec, a field of view of up to one deg, and a sensitivity several hundred times greater than previously available in any Xray astronomy experiment.
Journal ArticleDOI
Results from an extensive Einstein stellar survey.
G. S. Vaiana,J. P. Cassinelli,Giuseppina Fabbiano,Riccardo Giacconi,Leon Golub,Paul Gorenstein,B. M. Haisch,F. R. Harnden,H. Johnson,Jeffrey L. Linsky,C. W. Maxson,R. Mewe,Robert Rosner,F. D. Seward,K. Topka,C. Zwaan +15 more
TL;DR: The preliminary results of the Einstein Observatory stellar X-ray survey are presented in this article, showing that stars in general constitute a pervasive class of low-luminosity galactic Xray sources.
Journal ArticleDOI
Discovery of an X-ray star association in VI Cygni (CYG OB2)
F. R. Harnden,G. Branduardi,Martin Elvis,Paul Gorenstein,J. E. Grindlay,J. P. Pye,Robert Rosner,K. Topka,G. S. Vaiana +8 more
TL;DR: A group of six X-ray sources located within 0.4 deg of Cygnus X-3 has been discovered with the Einstein Observatory as mentioned in this paper, and five of them correspond to stars in the heavily obscured OB association VI Cygni.
Journal ArticleDOI
Soft X-ray structure of the Perseus cluster of galaxies
TL;DR: In this article, the authors used a focusing telescope system aboard a sounding rocket to obtain a 05-15-keV X-ray image of the Perseus cluster of galaxies.
Journal ArticleDOI
The stellar contribution to the galactic soft X-ray background
Robert Rosner,Y. Avni,Jay A. Bookbinder,Riccardo Giacconi,L. Golub,F. R. Harnden,C. W. Maxson,K. Topka,G. S. Vaiana +8 more
TL;DR: In this paper, the authors constructed log N-log S relations for stars based on median X-ray luminosities for dF, dG, and dK stars and investigated the stellar contribution to the diffuse soft Xray background in the 0.28-1.0 keV passband.