Department of Physics and Astronomy

Dr. Jan-Uwe Ness


Bild von Jan-Uwe Ness Saturn
Orion Nebula
taken with my Digital Camera on Hamburg's Great Refractor

........ and a little Jan with his Great Aunt......


Address:

Arizona State University
Department of Physics and Astronomy
PO Box 871504
Tempe, AZ, 95287-1504, USA

Phone: +1 (480) 727-7909
Telefax: +1 (480) 965-7954
e-mail : Jan-Uwe.Ness@asu.edu


Career

I obtained my PhD degree on high-resolution X-ray spectroscopy of Stellar Coronae at Hamburger Sternwarte, the observatory of the University of Hamburg, Germany. My second post-doc position was at the University of Oxford, where I worked with href="http://www-thphys.physics.ox.ac.uk/user/CaroleJordan/"> Prof. Dame Carole Jordan (8/2004-12/2005) on X-ray and UV spectroscopy of Stellar Coronae. Since January 2006 I work on Classical Novae at Arizona State University with Prof. Sumner Starrfield. The project is funded by a Chandra Fellowship grant. I have been appointed for a scientist position at the XMM-Newton Science Operations Centre and will start at Collection of links to external press releases

Curriculum vitae

PDF-Format
Postscript Format

Research Interests:


Activities


Publications

All publications
PS version; pdf version

Past year
All years
click numbers to get ps version of article

36 "Swift X-ray Observations of Classical Novae"
Ness, J.-U., Schwarz, G., Retter, A., Starrfield, S., Schmitt, J.H.M.M., Gehrels, N., and Burrows, D. 2007,
accepted by ApJ
pdf version

35 "X-rays from Classical T Tauri St ars: Coronae or Accretion Shocks ?"
Ness, J.-U. and Schmitt, J.H.M.M. 2006,
Proc eedings of WORKSHOP High resolution X-ray spectroscopy: towards XEUS and Con-X
pdf version

34 "V723 Cas: A dying nova or a new-bor n SSS?"
Ness, J.-U., Starrfield, S., and Schwarz, G. 2006,
Proc eedings of WORKSHOP High resolution X-ray spectroscopy: towards XEUS and Con-X
pdf version

33 "Densities of stellar flares from spectral lines"
Mitra-Kreav, U. and Ness, J.-U. 2006,
Proc eedings of WORKSHOP High resolution X-ray spectroscopy: towards XEUS and Con-X
pdf version

32 "Die explodierte Zigarre" (in German)
Steenken, N. and Ness, J.-U. 2005,
Sterne und Weltraum 12/05, page 68

31 "Anomalous X-ray line ratios in the cTTS TW Hya"
Ness, J.-U. and Schmitt, J.H.M.M. 2005,
A&A 444, L41 pdf version

30 "An X-ray emission line spectrum of Nova V382 Velorum 1999"
Ness, J.-U., Starrfield, S., Jordan, C. Krautter, J., Schmitt, J.H.M.M. 2005,
MNRAS 364, 1015 pdf version

29 "Detection of X-ray emission from beta Pictoris with XMM-Newton:
a cool corona, a boundary layer or what?"
Hempel, M., Robrade, J., Ness, J.-U., Schmitt, J.H.M.M. 2005,
A&A 440, 727 pdf version

28 "On the nature of the X-ray source in GK Persei"
Vrielmann, S., Ness, J.-U., Schmitt, J.H.M.M. 2005,
A&A 439, 287 pdf version

27 "Spectral Indications of Density Variability in the Corona of AD Leonis"
Maggio, A. and Ness, J.-U. 2005,
ApJL 622, 57 pdf version

26 "X-rays from accretion shocks in T Tauri stars: The case of BP Tau"
Schmitt, J.H.M.M., Robrade, J., Ness, J.-U., Favata, F., and Stelzer, B. 2005,
A&AL 432, 35 pdf version

25 "Modeling CHANDRA low energy transmission grating spectrometer observations of classical novae with PHOENIX. I. V4743 Sagittarii"
Petz, A., Hauschildt, P.H., Ness, J.-U., and Starrfield, S. 2005,
A&AL 432, 35 pdf version

24 "The value of density measurements in stellar coronae"
Ness, J.-U. and Jordan, C. (pdf version)
Poster presentation AIP Conference Proceedings 774, 187
(XDAP workshop)

23 "X-rays of stellar Coronae with Chandra and XMM-Newton: densities and structures in stellar Coronae"
Ness, J.-U. Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 5 - 9 July 2004, Hamburg, Germany.
ESA Special Publications series (ESA SP-560), page 33 pdf version

22 "Advances of plasma diagnostics with high-resolution spectroscopy of stellar coronae"
Ness, J.-U.
Adv. in Space Research 38, 1494 (2006) pdf version

21 "On the sizes of stellar X-ray coronae"
Ness, J.-U., Güdel, M., Schmitt, J.H.M.M., Audard, M., and Telleschi, A. 2004,
A&A 427, 667-683 (2004) pdf version

20 "Is T Leonis a superoutbursting intermediate polar?"
Vrielmann, S., Ness, J.-U., and Schmitt, J.H.M.M.
A&A, 419, 673 (2004) pdf version

19 "Detection of Saturnian X-ray emission with XMM-Newton"
Ness, J.-U., Schmitt, J.H.M.M., and Robrade, J.
A&AL, 414, 49 (2004) pdf version

18 "X-ray emission from Saturn"
Ness, J.-U., Schmitt, J.H.M.M., Wolk, S.J., Dennerl, K., and Burwitz, V.
A&A, 418, 337 (2004) pdf version

17 "High-resolution X-ray plasma diagnostics of stellar coronae in the XMM-Newton and Chandra era"
Ness, J.-U., Reviews in Modern Astronomy, 17, 189-208

16 "Coronal abundances from high-resolution X-ray data: The case of Algol"
J.H.M.M. Schmitt and Ness, J.-U.
A&A 415, 1099 (2004) pdf version

15 "Are stellar coronae optically thin in X-rays? -- A systematic investigation of opacity effects"
Ness, J.-U., Schmitt, J.H.M.M., Audard, M., Güdel, M., and Mewe, R. 2003,
A&A 407, 347; pdf version A&A online

14 "A Chandra LETGS observation of V4743 Sgr: A Super Soft X-ray Source and a Violently Variable Light Curve"
Ness, J.-U., Starrfield, S., Burwitz, V., Wichmann, R., Hauschildt, P., Drake, J.J., Krautter, J., Orio, M., Hernanz, M., Gehrz, R.D, Woodward, C.E., Butt, Y., Mukai, K., Balman, S., and Truran, J.W. 2003
ApJL 594, 127 (2003); pdf version; ApJL online

13 "A spatially resolved limb flare on Algol B observed with XMM-Newton"
J.H.M.M. Schmitt, Ness, J.-U., and Franco, G.,
A&A 412, 849 (2003) pdf version

12 "Modeling the NeIX Triplet Spectral Region of Capella with the Chandra and XMM-Newton Gratings"
Ness, J.-U., Brickhouse, N.S., Drake, J.J., and Huenemoerder, D.P., 2003
ApJ, 598, 1277-1289 pdf version

11 "Coronal densities and temperatures for cool stars in different stages of activity"
Ness, J.-U., Audard, M., Schmitt, J.H.M.M., and Güdel, M.
Adv. Space Res. Vol. 32, No. 6, pp. 937-943(2003)

10 "Coronal density diagnostics with Helium-like triplets:
CHANDRA--LETGS observations of Algol, Capella, Procyon, Epsilon Eri, Alpha Cen A&B, UX Ari, AD Leo, YY Gem, and HR 1099"
Ness, J.-U., Schmitt, J.H.M.M., Burwitz, V., Mewe, R., Raassen, A.J.J., van der Meer, R.L.J., Predehl, P., and Brinkman, A.C. 2002,
A&A 394, 911-926

9 "CORA: Emission line fitting with Maximum Likelihood"
Ness, J.-U. and Wichmann, R. 2002,
Astron. Nachr. 323, 129

8 "High-resolution X-ray plasma diagnostics of stellar coronae"
PhD Thesis, Januar (2002);alternatively from Staats- und Universitätsbibliothek Hamburg

7 "Chandra LETGS Observation of the Active Binary Algol"
Ness, J.-U., Schmitt, J.H.M.M., Burwitz, V., Mewe, R., and Predehl, P. 2002,
A&A 387, 1032

6 "Influence of radiation fields on He-like density diagnostics"
(Viewgraphs for talk at Cool Stars Workshop 12 in Boulder, Colorado, USA)
Ness, J.-U., Mewe, R., Schmitt, J.H.M.M., and Raassen, A.J.J.
In: "The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown, G.M. Harper, & T.R. Ayres
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems, & The Sun, Univ. Colorado, P.255-264 (PDF version)

5 "Influence of radiation fields on plasma density diagnostics"
(Poster for Stellar Coronae 2001) (PDF version)
Ness, J.-U., Mewe, R., Schmitt, J.H.M.M., and Raassen, A.J.J. In: F.Favata and J.J. Drake (eds.): ASP Conf Ser. 277, 545

4 "Coronal density diagnostics with He-like triplets using Chandra LETGS"
(Viewgraphs for talk at Stellar Coronae 2001)
Ness, J.-U., Mewe, R., Schmitt, J.H.M.M., Raassen, A.J.J., van der Meer, R.L.J., Burwitz, V., Predehl, P, and Brinkman, A.C.
In: F.Favata and J.J. Drake (eds.): ASP Conf Ser. 277, 127

3: "Helium-like triplet density diagnostics:
Applications to CHANDRA-LETGS X-ray observations of Capella and Procyon "
Ness, J.-U., Mewe, R., Schmitt, J.H.M.M, Raassen, A.J.J., Porquet, D., Kaastra, J.S., van der Meer, R.L.J., Burwitz, V., and Predehl, P. 2001
A&A, 367, 282-296

2: "A Search for X-ray emission from Saturn, Uranus and Neptune"
Ness, J.-U. and Schmitt, J.H.M.M. 2000,
A&A 355, 394-397 pdf version

1: "Wechselwirkung unterschiedlich großer Galaxien und dadurch induzierte Sternentstehung"
Ness, J.-U. Diplomarbeit 1998, Institut für Theoretische Physik und Astrophysik der Christian-Albrechts Universität Kiel


Personal Stuff:

Pictures of Comets
My musical organ
Mars with my own digital cammera in comparison with recent Hubble Image
Last modified: Friday, 14-Nov-2008 21:43:44 CET by ness@thphys.ox.ac.uk