C. Karl

1.0k total citations
13 papers, 495 citations indexed

About

C. Karl is a scholar working on Astronomy and Astrophysics, Instrumentation and Nuclear and High Energy Physics. According to data from OpenAlex, C. Karl has authored 13 papers receiving a total of 495 indexed citations (citations by other indexed papers that have themselves been cited), including 12 papers in Astronomy and Astrophysics, 8 papers in Instrumentation and 2 papers in Nuclear and High Energy Physics. Recurrent topics in C. Karl's work include Stellar, planetary, and galactic studies (10 papers), Gamma-ray bursts and supernovae (9 papers) and Astronomy and Astrophysical Research (8 papers). C. Karl is often cited by papers focused on Stellar, planetary, and galactic studies (10 papers), Gamma-ray bursts and supernovae (9 papers) and Astronomy and Astrophysical Research (8 papers). C. Karl collaborates with scholars based in Germany, United Kingdom and Russia. C. Karl's co-authors include U. Heber, N. Christlieb, R. Napiwotzki, H. Drechsel, E.-M. Pauli, G. Nelemans, D. Reimers, D. Koester, H. Edelmann and A. Renzini and has published in prestigious journals such as Astronomy and Astrophysics, Astronomische Nachrichten and ArXiv.org.

In The Last Decade

C. Karl

13 papers receiving 482 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
C. Karl Germany	9	492	200	27	22	10	13	495
E. Yaz Türkiye	12	382 0.8×	192 1.0×	34 1.3×	15 0.7×	17 1.7×	25	385
E.-M. Pauli Germany	9	468 1.0×	213 1.1×	27 1.0×	16 0.7×	9 0.9×	14	481
M. R. Villamariz Spain	7	495 1.0×	201 1.0×	17 0.6×	16 0.7×	4 0.4×	9	503
David K. Lai United States	6	467 0.9×	232 1.2×	10 0.4×	43 2.0×	10 1.0×	7	475
G. Hill Canada	11	264 0.5×	124 0.6×	22 0.8×	12 0.5×	10 1.0×	25	272
J. Jurcsik Hungary	16	538 1.1×	237 1.2×	38 1.4×	12 0.5×	8 0.8×	50	550
Ian Steer Türkiye	3	260 0.5×	114 0.6×	31 1.1×	21 1.0×	6 0.6×	7	267
A. Niedzielski Poland	16	592 1.2×	341 1.7×	10 0.4×	25 1.1×	9 0.9×	50	599
G. Casali Italy	11	263 0.5×	145 0.7×	18 0.7×	24 1.1×	6 0.6×	21	281
L. M. Freyhammer Belgium	14	415 0.8×	205 1.0×	18 0.7×	12 0.5×	19 1.9×	29	428

Countries citing papers authored by C. Karl

Since Specialization

Citations

This map shows the geographic impact of C. Karl's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by C. Karl with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites C. Karl more than expected).

Fields of papers citing papers by C. Karl

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by C. Karl. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by C. Karl. The network helps show where C. Karl may publish in the future.

Co-authorship network of co-authors of C. Karl

This figure shows the co-authorship network connecting the top 25 collaborators of C. Karl. A scholar is included among the top collaborators of C. Karl based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with C. Karl. C. Karl is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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13 of 13 papers shown

Geier, S., C. Karl, H. Edelmann, U. Heber, & R. Napiwotzki. (2008). Binary sdB Stars with Massive Compact Companions. University of Hertfordshire Research Archive (University of Hertfordshire). 392. 207. 1 indexed citations

Karl, C., U. Heber, C. S. Jeffery, R. Napiwotzki, & S. Geier. (2006). Spectroscopic Analysis of Sdb Binaries from the Spy Project. CERN Bulletin. 15. 151–158. 4 indexed citations

Edelmann, H., U. Heber, M. Altmann, C. Karl, & T. Lisker. (2005). High resolution spectroscopy of bright subdwarf B stars. Astronomy and Astrophysics. 442(3). 1023–1030. 41 indexed citations

Nelemans, G., C. Karl, B. Voß, et al.. (2005). Binaries discovered by the SPY project. Astronomy and Astrophysics. 440(3). 1087–1095. 58 indexed citations

Nelemans, G., R. Napiwotzki, C. Karl, et al.. (2005). Binaries discovered by the SPY project. IV. Five single-lined DA double white dwarfs. Radboud Repository (Radboud University). 51 indexed citations

Heber, U., H. Drechsel, R. H. Østensen, et al.. (2004). HS 2333+3927: A new sdB+dM binary with a large reflection effect. Astronomy and Astrophysics. 420(1). 251–264. 30 indexed citations

Napiwotzki, R., C. Karl, G. Nelemans, et al.. (2004). Close binary white dwarfs and supernovae IA. Radboud Repository (Radboud University). 20(2). 113–116. 2 indexed citations

Napiwotzki, R., N. Christlieb, H. Drechsel, et al.. (2003). SPY - the ESO Supernovae type Ia Progenitor survey. University of Hertfordshire Research Archive (University of Hertfordshire). 112. 25–30. 51 indexed citations

Karl, C., R. Napiwotzki, U. Heber, et al.. (2001). Rotation Velocities of White Dwarfs. Springer Link (Chiba Institute of Technology). 18. 6 indexed citations

10.

Koester, D., R. Napiwotzki, N. Christlieb, et al.. (2001). High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia progenitor survey (SPY). I.. Astronomy and Astrophysics. 378(2). 556–568. 99 indexed citations

11.

Napiwotzki, R., H. Edelmann, U. Heber, et al.. (2001). Binaries discovered by the SPY project. Astronomy and Astrophysics. 378(1). L17–L20. 36 indexed citations

12.

Napiwotzki, R., N. Christlieb, H. Drechsel, et al.. (2001). Search for progenitors of supernovae type Ia with SPY. Astronomische Nachrichten. 322(5-6). 411–418. 87 indexed citations

13.

Napiwotzki, R., H. Edelmann, U. Heber, et al.. (2001). Binaries discovered by the SPY project I. HE 1047-0436: a subdwarf B + white dwarf system. ArXiv.org. 29 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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