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?)
Abstract
Multi-colour photometry (Walraven system) of five super- and hypergiants in the LMC, viz. R 74, R 78, HD 34664, R 84 and R 116, is searched for variability and periods, and discussed. Apart from R 84, of which the claimed variability in the past must be due to a number of faint field stars at the edge of the apertures, all are variable. R 74 and HD 34664 are weak-active LBVs with superimposed microvariations. HD 34664 is the second known B[e] star which is also an LBV. The first reported one is R 4 in the SMC. This could alter some views on the evolutionary history of B[e] stars and LBVs. R 78 is an alpha Cyg variable, but presumably no LBV. R 116 appears to be a close counterpart of the galactic ex-/dormant LBV zeta (1) Sco, also showing an intricate alpha Cyg-type multi-period microvariability. Based on observations obtained at the European Southern Observatory at La Silla, Chile}
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1999
- Bibcode:
- 1999A&A...349..537V
- Keywords:
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- STARS: INDIVIDUAL: R 116 = HDE 269700;
- R 74 = HDE 268939;
- R 78 = HDE 269050;
- R 84 = HDE 269227;
- S 22 = HD 34664;
- GALAXIES: MAGELLANIC CLOUDS