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The latest developments on Of?p stars

  • Yael Nazé (a1), Asif ud-Doula (a2), Maxime Spano (a3), Gregor Rauw (a1), Michael De Becker (a1) and Nolan R. Walborn (a4)...

Abstract

In recent years several in-depth investigations of the three prototypical Of?p stars were undertaken, revealing their peculiar properties. To clarify some of the remaining questions, we have continued our monitoring of the prototypical Of?p trio. HD 108 has now reached its quiescent, minimum-emission state, for the first time in 50–60yrs, while new echelle spectra of HD 148937 confirm the presence in several H and He lines of the 7d variations detected previously only in the Hα line. A new XMM observation of HD 191612 clearly shows that its X-ray emission is not modulated by the orbital period of 1542d, but the high-energy variations are rather compatible with the 538d period of the optical changes - it is thus not of colliding-wind origin but linked to the phenomena responsible for the spectral/photometric variations, though our current MHD simulations remain at odds with the observational properties.

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References

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Andrillat, Y., Fehrenbach, C., Swings, P., & Vreux, J. M. 1973, A&A, 29, 171
Nazé, Y., Vreux, J.-M., & Rauw, G. 2001, A&A, 372, 195
Nazé, Y., Barbieri, C., Segafredo, A., Rauw, G. et al. 2006, IBVS 5693
Nazé, Y., Rauw, G., Pollock, A. M. T., Walborn, N. R. et al. 2007, MNRAS, 375, 145
Nazé, Y., Walborn, N. R., & Martins, F. 2008a, Rev. Mexicana AyA 44, 331
Nazé, Y., Walborn, N. R., Rauw, G., Martins, F. et al. 2008b, AJ, 135, 1946
Nazé, Y., Ud-Doula, A., Spano, M., Rauw, G. et al. 2010, A&A 520A, 59
Walborn, N. R., Sota, A., Maíz Apellániz, J., Alfaro, E. J. et al. 2010, ApJ (Letters), 711, L143
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