Hrivnak, B. J. ; Lu, W. ; Van de Steene, G. ; Van Winckel, H. ; Sperauskas, J. ; Bohlender, D.

published in EAS Publications Series, 71, pp. 127-128 (2015)

Abstract: We have investigated pulsations and searched for binarity in 7 bright proto-planetary nebulae. All are found to pulsate, with dominant periods of 39-132 days. However, no strong evidence of binarity is found in any of them. This implies that any binary companion must have either a very long period (>30 yr) or low mass (0.2 Msun). This appears to rule out Roche lobe overflow as a contribution to the shaping of the surrounding nebula.

DOI: 10.1051/eas/1571026
Links: link