Universiteit Leiden

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Arnout van Genderen

Associate Professor / Guest

Name
Dr. A.M. van Genderen
Telephone
+31 71 527 5863
E-mail
genderen@strw.leidenuniv.nl
ORCID iD
0000-0002-7625-6366

Arnout van Genderen started his astronomical career at the Leiden Observatory as a 'candidate assistent' in 1961, and was fascinated by the study of variable stars by means of multi-colour photometry. A novelty was that he found proof that the light variations of magnetic stars are periodic and in phase with the magnetic variations. This was based on the photometry done with the 45-cm Zunderman reflector. After his Master of Science he was sent to the Leiden Southern Station Hartebeespoortdam, Broederstroom, Transvaal (now called Gauteng), South Africa, in 1966 for half a year. The main telescope was the 90-cm Lightcollector equipped with the Walraven 5-colour photometer. For the first time it was shown that Cepheids in the Small Magellanic Cloud showed a strong ultraviolet-excess confirming that they are metal poor. The subject of his PhD in 1969 concerned Cepheids in the Small Magellanic Cloud. The dust-to-gas ratio of its interstellar medium appeared to be about five times smaller than in our Galaxy: obviously the cause of their low metal content. He was sent out to the Leiden Southern Station early 1971 once more, now for eight years until 1978. The observations were made for colleagues and himself. The main subject of research concerned many types of variable stars, which were the basis for a number of theses and many papers. Additionally, he trained numerous students sent out by the Dutch astronomical institutes, to get used to a telescope and how to deal with the raw data and the calibration processes. As an amateur-archeologist he discovered on the grounds of the Oservatory the remains of an Early Iron Age village, which turned out te be the oldest and the best preserved Early Iron Age village of Africa South of the Sahara. Carbon dating yielded the years 300-600. This meant that Bantu-language speaking people migrated to South-Africa (their ancestors came from Cameroon and the Congo-Basin), 1000 years earlier than historians believed. Back at the Leiden Observatory he decided to stop observing. Roughly 20 000 hours of working at night were enough, apart from a few weeks at the ESO, Chile, to use the Lightcollector again, which just was moved from South-Africa to the ESO. He was appointed 'Universitair Hoofddocent' equivalent to Associate Professor, in the nineties. He retired in 2001, but is still doing research in the field of variable stars.

More information about Arnout van Genderen

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Associate Professor / Guest

  • Science
  • Sterrewacht
  • Sterrewacht

Work address

Huygens
Niels Bohrweg 2
2333 CA Leiden
Room number 509

Contact

  • Genderen A.M. van, Nieuwenhuijzen H. & Lobel A. (2015), An early detection of blue luminescence by neutral PAHs in the direction of the yellow hypergiant HR 5171A?, 583: A98. article in journal: refereed
  • Genderen A. (2014), Personal Ornament in the Early Iron Age of the Transvaal: New Discoveries at Site 24/73 (Leiden Observatory), South African Journal of Science 70: 218-219. article in journal: refereed
  • Chesneau O., Meilland A., Chapellier E., Millour F., Genderen A.M. van, Nazé Y., Smith N., Spang A., Smoker J., Dessart L., Kanaan S., Bendjoya P., Feast M., Groh J., Lobel A., Nardetto N., Otero S., Oudmaijer R., Tekola A., Whitelock P., Arcos C., Curé M. & Vanzi L. (2014), The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase, Astronomy & Astrophysics 563: A71. article in journal: refereed
  • Genderen A., Veijgen S. & Hucht K. (2013), The photometric variability of the WC9-type Wolf-Rayet star WR 103, Astrophysics and Space Science 345: 133-145. article in journal: refereed
  • Houten C.J. van, Houten-Groeneveld I. van, Genderen A.M. van & Kwee K.K. (2009), VBLUW photometry of 13 eclipsing binary stars, The Journal of Astronomical Data 15(2): 2. article in journal: refereed
  • Sterken C., Genderen A.M. van, Plummer A. & Jones A.F. (2008), Wra 751, a luminous blue variable developing an S Doradus cycle, Astronomy & Astrophysics 484: 463-467. article in journal: refereed
  • Genderen A.M. van & Sterken C. (2007), Orbital effects on the light curves of eta Car, BP Cru, and Other Eccentric Binaries, Informational Bulletin on Variable Stars 5782: 1. article in journal: refereed
  • Genderen A.M. van, Sterken C., Allen W.H. & Walker W.S.G. (2006), An overview of the photometric events, trends and brightenings of eta Carinae, Journal of Astronomical Data 12(3). article in journal: refereed
  • Genderen A.M. van, Jones A. & Sterken C. (2006), Light variations of alpha Cygni variables in the Magellanic Clouds, Journal of Astronomical Data 12(4). article in journal: refereed
  • Genderen A.M. van & Sterken C. (2005), A photometric study of 11 massive stars in the Magellanic Clouds, Astronomische Nachrichten = Astronomical notes 326: 725-730. article in journal: refereed
  • Allen W.H., Genderen A.M. van & Sterken C. (2005), The 2003.5 Post-Periastron Brightening of eta Carinae, Informational Bulletin on Variable Stars 5601: 1. article in journal: refereed
  • Genderen A.M. van, Sterken C. & Jones A.F. (2004), Light variations of massive stars (α Cyg variables). XIX. The late-type supergiants R 59, HDE 268822, HDE 269355, HDE 269612 and HDE 270025 in the LMC, Astronomy & Astrophysics 419: 667-671. article in journal: refereed
  • Genderen A.M. van & Sterken C. (2004), η Carinae: The 1998 brightening and the smearing-out effect, Astronomy & Astrophysics 423: L1-L4. article in journal: refereed
  • Genderen A.M. van, Sterken C. & Allen W.H. (2003), Eta Carinae: The optical flare-like events during low-excitation passages, Astronomy & Astrophysics 405: 1057-1062. article in journal: refereed
  • Genderen A.M. van, Sterken C., Allen W.H. & Liller W. (2003), Eta Car: the optical features at the 2003.5 low-excitation event, Astronomy & Astrophysics 412: L25-L28. article in journal: refereed
  • Paardekooper S., Hucht K.A. van der, Genderen A.M. van, Brogt E., Gieles M. & Meijerink R. (2003), New type of brightness variations of the colliding wind W04 + 05((f)) binary WR 30a, Astronomy & Astrophysics 404: L29-L32. article in journal: refereed
  • Genderen A.M. van (2003), The effect of the apsidal motion on the light curve of the close binary HD 93205 (O3V+O8V), Astronomy & Astrophysics 397: 921-925. article in journal: refereed
  • Genderen A.M. van & Sterken C. (2002), Light variations of massive stars (alpha Cyg variables). XVIII. The B[e] supergiants S 18 in the SMC and R 66 = HDE 268835 and R 126 = HD 37974 in the LMC, Astronomy & Astrophysics 386: 926-935. article in journal: refereed
  • Paardekooper S., Veen P.M., Genderen A.M. van & Hucht K.A. van der (2002), On the variability of the visual binary WR86, WC7 with a ß-Cephei companion, Astronomy & Astrophysics 384: 1012-1022. article in journal: refereed
  • Veen P.M., Genderen A.M. van & Hucht K.A. van der (2002), The enigmatic WR46: A binary or a pulsator in disguise. III. Interpretation, Astronomy & Astrophysics 385: 619-631. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Crowther P.A. & Hucht K.A. van der (2002), The enigmatic WR46: A binary or a pulsator in disguise. II. The spectroscopy, Astronomy & Astrophysics 385: 600-618. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Hucht K.A. van der, Allen W.H., Arentoft T. & Sterken C. (2002), The enigmatic WR46: A binary or a pulsator in disguise. I. The photometry, Astronomy & Astrophysics 385: 585-599. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Hucht K.A. van der & Sterken C. (1999), Is WR 103 (WC9) as violent as the WN8 stars?. In: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies. IAU Colloq.. 261. conference paper
  • Genderen A.M. van & Sterken C. (1999), Light variations of massive stars (alpha Cygni variables). XVII. The LMC supergiants R 74 (LBV), R 78, HD 34664 = S 22 (B[e]/LBV), R 84 and R 116 (LBV?), Astronomy & Astrophysics 349: 537. article in journal: refereed
  • Veen P.M., Genderen A.M. van & Jones A.F. (1999), Long-term variation in the short-period binary system WR46 (WN3p+?). In: olf-Rayet Phenomena in Massive Stars and Starburst Galaxies. IAU Colloq.. 263. conference paper
  • Sterken C., Freyhammer L., Arentoft T. & Genderen A.M. van (1999), On the recent brightening of eta Carinae, Astronomy & Astrophysics 346: L33. article in journal: refereed
  • Genderen A.M. van, Sterken C., Groot M. & Burki G. (1999), Photometric behaviour of eta Carinae, a celestial Chinese lantern: 1974-1998, Astronomy & Astrophysics 343: 847. article in journal: refereed
  • Duerbeck H.W. & Genderen A.M. van (1999), Sakurai's Object: A rare stellar Cataclysm, Southern Stars 38: 80. article in magazine/newspaper
  • Duerbeck H.W., Genderen A.M. van, Gautschy A., Pavlenko Y.V., Brogt E., Janson M., Jones A.F., Kurk J., Liller W., Sterken C. & Voskes T. (1999), Sakurai's Object (V4334 Sgr): Pulsational Instability and Onset of Dust Formation in a Final Helium-Flash Star. In: Unsolved Problems in Stellar Evolution. STScI Symp. Ser.. 17. conference paper
  • Sterken C., Genderen A.M. van, Groot M.J. de & Burki G. (1999), The Variability of eta Carinae in the Visual Spectral Region. In: Eta Carinae at The Millennium. Astronomical Society of the Pacific Conference Series. 200. conference paper
  • Sterken C., Groot M. & Genderen A.M. van (1998), Cyclicities in the light variations of Luminous Blue Variables. II. R40 developing an S Doradus phase, Astronomy & Astrophysics 333: 565. article in journal: refereed
  • Duerbeck H.W. & Genderen A.M. van (1998), De laatste heliumflits van de Ster van Sakurai, Zenit 25: 112. article in magazine/newspaper
  • Genderen A.M. van (1998), De laatste heliumflits van de Ster van Sakurai: Een zeldzamevsterexplosie, Zenit : 112-116. article in magazine/newspaper
  • Leeuwen F. van, Genderen A.M. van & Zegelaar I. (1998), Hipparcos photometry of 24 variable massive stars (alpha Cygni variables), Astronomy and Astrophysics Supplement Series 128: 117. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Hucht K.A. van der & Sterken C. (1998), Is WR1303(WC9) as Violent as the WN8 stars?, IAU Colloq. 169. article in journal
  • Genderen A.M. van, Sterken C. & Groot M.S. de (1998), Light variations of massive stars (alpha Cyg variables). XVI. The LMC supergiants R 85 (LBV) and R 110 (LBV) and the SMC supergiants R 42 and R45, Astronomy & Astrophysics 337: 393. article in journal: refereed
  • Genderen A.M. van, Sterken C., Groot M.S. de & Reijns R.A. (1998), Light variations of massive stars (alpha Cyg variables). XV. The LMC supergiants R99 (LBV), R103, R123 (LBV) and R128, Astronomy & Astrophysics 332: 857. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Hucht K.A. van der & Jones A. (1998), Long-term changes in binary system WR46 (WN3p+?). In: Hucht K.A. van der, Eenens P., Koerigsberger G. (Eds.) Wolf-Rayet Phenomena in Massive Star and Starburst Galaxies, IAU Symp 193.. 100. book chapter
  • Liller W., Duerbeck H.W., Meer A. van der & Genderen A.M. van (1998), V4334 Sagittarii, International Astronomical Union Circulars 7049: 2. article in journal: refereed
  • Liller W., Janson M., Duerbeck H.W. & Genderen A.M. van (1998), V4334 Sagittarii, International Astronomical Union Circulars 6825: 2. article in journal: refereed
  • Veen P.M., Genderen A.M. van, Hucht K.A. van der, Li A., Sterken C. & Dominik C. (1998), WR 121 obscured by a dust cloud: the key to understanding occasional "eclipses" of "dusty" Wolf-Rayet WC stars?, Astronomy & Astrophysics 329: 199. article in journal: refereed
  • Genderen A.M. van (1996), FG Sagittae, speeltje voor waarnemers en astrofysici, Zenit : 8-13. article in magazine/newspaper
  • Genderen A.M. van (1979), Leidse Light Collector verhuist naar ChilGen, : 9. article in magazine/newspaper
  • Genderen A.M. van (1979), Long time baseline VBLUW photometry of four of the most luminous LMC supergiants HD 33579, HD 35343=S Dor, HDE 268757 and HDE 269006. I, Astronomy and Astrophysics Supplement Series 38: 151-154. article in journal: refereed
  • Genderen A.M. van (1976), Het Zuidelijk Station van de Leidse Sterrewacht in Broerderstroom, Zenit : 412-416. article in magazine/newspaper
  • Genderen A.M. van (1974), Nieuwe vondsten prehistorische dorpen in Transvaal. Bantoes zaten al 1000j eerder in Zuid-Afrika dan historici dachten. NRC Handelsblad, 24-8-1974, Zaterdag bijvoegsel: Z4. article in magazine/newspaper
  • Genderen A.M. van (1974), Personal Ornaments in the Early Iron Age of the Transvaal: New Discoveries at Site 24/73, Broederstroom, Transvaal, South Africa, South African Journal of Science 70(7): 218-219. article in journal
  • Genderen A.M. van (1967), Aardse en Astronomische oorzaken van klimaatveranderingen, Hemel en Dampkring (5): 1-75. article in magazine/newspaper
  • Jansen A.G. & Genderen A.M. van (1964), Een supernova in NGC 1073, Hemel en Dampkring : 7-13. article in magazine/newspaper
  • Genderen A.M. van (1963), Over het probleem der regelmaat in planeet- en satellietbaanstralen, Hemel en Dampkring : 172-173. article in magazine/newspaper
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