University of Hertfordshire

Dr Ralf Napiwotzki

Dr Ralf Napiwotzki

Postal address:
University of Hertfordshire, Hatfield, Hertfordshire
United Kingdom

Publications

  1. 2019
  2. The ESO supernovae type Ia progenitor survey (SPY): The radial velocities of 644 DA white dwarfs

    Napiwotzki, R., Karl, C. A., Lisker, T., Catalan, S., Drechsel, H., Heber, U., Homeier, D., Koester, D., Leibundgut, B., Marsh, T. R., Moehler, S., Nelemans, G., Reimers, D., Renzini, A., Stroer, A. & Yungelson, L., 27 Jul 2019, In: Astronomy & Astrophysics. 638, 22 p., A131.

    Research output: Contribution to journalArticlepeer-review

  3. 2018
  4. Massive stars in the hinterland of the young cluster, Westerlund 2

    Drew, J. E., Herrero, A., Mohr-Smith, M., Monguio, M., Wright, N. J., Kupfer, T. & Napiwotzki, R., 21 Oct 2018, In: Monthly Notices of the Royal Astronomical Society: Letters. 480, 2, p. 2109–2124 16 p.

    Research output: Contribution to journalArticlepeer-review

  5. 2017
  6. The deep OB-star population in Carina from the VST Photometric H-alpha Survey (VPHAS+)

    Mohr-Smith, M., Drew, J., Napiwotzki, R., Simon-Diaz, S., Wright, N. J., Barentsen, G., Eisloeffel, J., Farnhill, H., Greimel, R., Monguio, M., Kalari, V., Parker, Q. A. & Vink, J. S., 21 Feb 2017, In: Monthly Notices of the Royal Astronomical Society. 465, 2, p. 1807-1830 24 p., stw2751.

    Research output: Contribution to journalArticlepeer-review

  7. 2016
  8. A search for white dwarfs in the Galactic plane: the field and the open cluster population

    Raddi, R., Catalan, S., Gaensicke, B. T., Hermes, J. J., Napiwotzki, R., Koester, D., Tremblay, P. -E., Barentsen, G., Farnhill, H. J., Mohr-Smith, M., Drew, J. E., Groot, P. J., Guzman-Ramirez, L., Parker, Q. A., Steeghs, D. & Zijlstra, A., 1 Apr 2016, In: Monthly Notices of the Royal Astronomical Society. 457, 2, 17 p.

    Research output: Contribution to journalArticlepeer-review

  9. 2015
  10. Discovery of a brown dwarf companion to the A3V star β Circini

    Smith, L., Lucas, P. W., Peña, C. C., Kurtev, R., Marocco, F., Jones, H. R. A., Beamin, J. C., Napiwotzki, R., Borissova, J., Burningham, B., Faherty, J., Pinfield, D. J., Gromadzki, M., Ivanov, V. D., Minniti, D., Stimson, W. & Villanueva, V., 21 Dec 2015, In: Monthly Notices of the Royal Astronomical Society. 454, 4, p. 4476-4483 8 p.

    Research output: Contribution to journalArticlepeer-review

  11. New OB star candidates in the Carina Arm around Westerlund 2 from VPHAS+

    Mohr-Smith, M., Drew, J. E., Barentsen, G., Wright, N. J., Napiwotzki, R., Corradi, R. L. M., Eislöffel, J., Groot, P., Kalari, V., Parker, Q. A., Raddi, R., Sale, S. E., Unruh, Y. C., Vink, J. S. & Wesson, R., 11 Jul 2015, In: Monthly Notices of the Royal Astronomical Society. 450, 4, p. 3855-3873 19 p.

    Research output: Contribution to journalArticlepeer-review

  12. Spectral classification of photometrically selected AGB candidates in NGC 6822

    Sibbons, L. F., Ryan, S. G., Napiwotzki, R. & Thompson, G. P., 2 Feb 2015, In: Astronomy and Astrophysics. 574, 33 p., A102.

    Research output: Contribution to journalArticlepeer-review

  13. The AGB population in IC 1613 using JHK photometry

    Sibbons, L. F., Ryan, S. G., Irwin, M. & Napiwotzki, R., 1 Jan 2015, In: Astronomy and Astrophysics. 573, 15 p., A84.

    Research output: Contribution to journalArticlepeer-review

  14. 2014
  15. The first planet detected in the WTS: an inflated hot-Jupiter in a 3.35 day orbit around a late F-star [ERRATUM]

    Cappetta, M., Saglia, R. P., Birkby, J. L., Koppenhoefer, J., Pinfield, D. J., Hodgkin, S. T., Cruz, P., Kovacs, G., Sipocz, B., Barrado, D., Nefs, B., Pavlenko, Y. V., Fossati, L., Burgo, C. D., Martin, E. L., Snellen, I., Barnes, J., Campbell, D. A., Catalan, S., Galvez-Ortiz, M. C. & 18 others, Goulding, N., Haswell, C., Ivanyuk, O., Jones, H. R. A., Kuznetsov, M., Lodieu, N., Marocco, F., Mislis, D., Murgas, F., Napiwotzki, R., Palle, E., Pollacco, D., Baro, L. S., Solano, E., Steele, P., Stoev, H., Tata, R. & Zendejas, J., 11 Nov 2014, In: Monthly Notices of the Royal Astronomical Society. 444, 4, p. 3150 stu1662.

    Research output: Contribution to journalArticlepeer-review

  16. Ultraviolet-excess sources with a red/infrared counterpart: Low-mass companions, debris discs and QSO selection

    Verbeek, K., Groot, P. J., Scaringi, S., Casares, J., Corral-Santana, J. M., Deacon, N., Drew, J. E., Gänsicke, B. T., Gonzalez-Solares, E., Greimel, R., Heber, U., Napiwotzki, R., Ostensen, R. H., Steeghs, D., Wright, N. J. & Zijlstra, A., Feb 2014, In: Monthly Notices of the Royal Astronomical Society. 438, 1, p. 2-13 12 p.

    Research output: Contribution to journalArticlepeer-review

  17. 2013
  18. A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey

    Verbeek, K., Groot, P. J., Nelemans, G. A., Scaringi, S., Napiwotzki, R., Drew, J. E., Steeghs, D. T. H., Casares, J., Corral-Santana, J. M., Gänsicke, B. T., González-Solares, E. A., Greimel, R., Heber, U., Irwin, M. J., Knigge, C., Wright, N. J. & Zijlstra, A., 1 Oct 2013, In: Monthly Notices of the Royal Astronomical Society. 434, 4, p. 2727-2741 15 p.

    Research output: Contribution to journalArticlepeer-review

  19. High Galactic latitude runaway stars as tracers of the spiral arms

    Silva, M. D. V. & Napiwotzki, R., May 2013, In: Monthly Notices of the Royal Astronomical Society. 431, 1, p. 502-510

    Research output: Contribution to journalArticlepeer-review

  20. The detection of an older population in the Magellanic Bridge

    Bagheri, G., Cioni, M-RL. & Napiwotzki, R., Mar 2013, In: Astronomy & Astrophysics. 551, 9 p., A78.

    Research output: Contribution to journalArticlepeer-review

  21. 2012
  22. Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey

    Verbeek, K., Groot, P. J., Scaringi, S., Nelemans, G., Napiwotzki, R., Spikings, B., Drew, J. E., Østensen, R. H., Steeghs, D., Gänsicke, B. T., Casares, J., Corral-Santana, J. M., Corradi, R. L. M., Deacon, N., Drake, J. J., González-Solares, E., Irwin, M. J., Greimel, R., Heber, U. & Knigge, C., 21 Oct 2012, In: Monthly Notices of the Royal Astronomical Society. 426, 2, p. 1235-1261 27 p.

    Research output: Contribution to journalArticlepeer-review

  23. The brightest pure-H ultracool white dwarf

    Catalan, S., Tremblay, P. -E., Pinfield, D. J., Smith, L., Zhang, Z. H., Napiwotzki, R., Marocco, F., Day-Jones, A. C., Gomes, J., Forde, K. P., Lucas, P. W. & Jones, H. R. A., Oct 2012, In: Astronomy & Astrophysics. 546, 5 p., 3.

    Research output: Contribution to journalArticlepeer-review

  24. MUCHFUSS - massive unseen companions to hot faint underluminous stars from SDSS

    Geier, S., Schaffenroth, V., Hirsch, H., Tillich, A., Heber, U., Maxted, P. F. L., Ostensen, R. H., Barlow, B. N., O'Toole, S. J., Kupfer, T., Marsh, T., Gaensicke, B., Napiwotzki, R., Cordes, O., Mueller, S., Classen, L., Ziegerer, E. & Drechsel, H., Jun 2012, In: Astronomische Nachrichten. 333, 5-6, p. 431-435 5 p.

    Research output: Contribution to journalArticlepeer-review

  25. The AGB population of NGC 6822: Distribution and the C/M ratio from JHK photometry.

    Sibbons, L. F., Ryan, S. G., Cioni, M-RL., Irwin, M. & Napiwotzki, R., Apr 2012, In: Astronomy & Astrophysics. 540, 24 p., A135.

    Research output: Contribution to journalArticlepeer-review

  26. 2011
  27. New short-period stellar pulsators at large Galactocentric distances

    Ramsay, G., Barclay, T., Napiwotzki, R., Barclay, T., Cropper, M., Hakala, P. & Potter, S., 1 Oct 2011, In: Monthly Notices of the Royal Astronomical Society. 417, 1, p. 400-407 8 p.

    Research output: Contribution to journalArticlepeer-review

  28. Stellar variability on time-scales of minutes: results from the first 5 yr of the Rapid Temporal Survey

    Barclay, T., Ramsay, G., Hakala, P., Napiwotzki, R., Nelemans, G., Potter, S. & Todd, I., Jun 2011, In: Monthly Notices of the Royal Astronomical Society. 413, 4, p. 2696-2708 13 p.

    Research output: Contribution to journalArticlepeer-review

  29. The magnetic and metallic degenerate G77-50

    Farihi, J., Dufour, P., Napiwotzki, R. & Koester, D., Jun 2011, In: Monthly Notices of the Royal Astronomical Society. 413, 4, p. 2559-2569 11 p.

    Research output: Contribution to journalArticlepeer-review

  30. A white dwarf companion to the relativistic pulsar PSR J1141-6545

    Antoniadis, J., Bassa, C. G., Wex, N., Kramer, M. & Napiwotzki, R., Mar 2011, In: Monthly Notices of the Royal Astronomical Society. 412, 1, p. 580-584 5 p.

    Research output: Contribution to journalArticlepeer-review

  31. The VMC survey I. Strategy and first data

    Cioni, M-RL., Clementini, G., Girardi, L., Guandalini, R., Gullieuszik, M., Miszalski, B., Moretti, M. I., Ripepi, V., Rubele, S., Bagheri, G., Bekki, K., Cross, N. J. G., de Blok, W. J. G., de Grijs, R., Emerson, J. P., Evans, C. J., Gibson, B., Gonzales-Solares, E., Groenewegen, M. A. T., Irwin, M. J. & 14 others, Ivanov, V. D., Lewis, J., Marconi, M., Marquette, J-B., Mastropietro, C., Moore, B., Napiwotzki, R., Naylor, T., Oliveira, J. M., Read, M., Sutorius, E., van Loon, J. T., Wilkinson, M. I. & Wood, P. R., Mar 2011, In: Astronomy and Astrophysics. 527, 22 p., A116.

    Research output: Contribution to journalArticlepeer-review

  32. Binaries discovered by the MUCHFUSS project SDSS J08205+0008 - An eclipsing subdwarf B binary with brown dwarf companion

    Geier, S., Schaffenroth, V., Drechsel, H., Heber, U., Kupfer, T., Tillich, A., Ostensen, R., Smolders, K., Degroote, P., Maxted, P. F. L., Barlow, B. N., Gansicke, B. T., Marsh, T. R. & Napiwotzki, R., 2011, In: The Astrophysical journal. 731, Part II

    Research output: Contribution to journalArticlepeer-review

  33. Brown dwarf companions to white dwarfs

    Burleigh, M. R., Steele, P. R., Dobbie, P. D., Farihi, J., Napiwotzki, R., Maxted, P. F. L., Barstow, M. A., Jameson, R. F., Casewell, S. L., Gaensicke, B. T. & Marsh, T. R., 2011, Planetary systems beyond the main sequence. Schuh, S., Drechsel, H. & Heber, U. (eds.). Meville: American Institute of Physics, p. 262-270 9 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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