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

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Light variations of massive stars ([FORMULA]  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 1

1 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 [FORMULA]  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

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© European Southern Observatory (ESO) 1998

Online publication: March 30, 1998
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