Astron. Astrophys. 332, 857-866 (1998)

Light variations of massive stars (  Cyg variables) ^*

XV. The LMC supergiants R 99 (LBV), R 103, R 123 (LBV) and R 128

A.M. van Genderen ¹, C. Sterken ^{** 2}, M. de Groot ³ and R.A. Reijns <sup>1

1</sup> Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
² University of Brussels (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
³ Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland

Received 20 October 1997 / Accepted 5 January 1998

Abstract

VBLUW photometry (Walraven system) of the four variable LMC supergiants R 99, R 103, R 123 and R 128 is analysed, searched for periods and discussed. Based on former and present photometry we conclude that two of the three emission-line objects are undoubtedly active LBVs (R 99 and R 123), although not so spectacular. R 123, like AG Car near minimum brightness, shows a low amplitude S Dor activity with superimposed  Cyg-type variations.

Key words: stars: variables: other supergiants stars: individual R 99 = HDE 269445, R 103 = HDE 269546 = -68 82, R 123 = HD 37836 = -69 201 = S 124, R 128 = HDE 269859 = -69 221

* Based on observations obtained at the European Southern Observatory at La Silla, Chile
** Belgian Fund for Scientific Research (FWO)

Send offprint requests to: A.M. van Genderen

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and reductions
• 3. The light- and colour curves, the period analysis
  • 3.1. R 99 = HDE 269445, Ofpe/WN9
  • 3.2. R 103 = HDE 269546 = -68 82, B3 Ip
  • 3.3. R 123 = HD 37836 = -69 201 = S 124, Bpec
  • 3.4. R 128 = HDE 269859 = -69 221, B2 Ia
• 4. Discussion and conclusions
  • 4.1. R 99 = HDE 269445
  • 4.2. R 103 = HDE 269546
  • 4.3. R 123 = HD 37836
  • 4.4. R 128 = HDE 269859
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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