Artículo de revista
Rotational velocities of the giants in symbiotic stars - I. D '-type symbiotics
Fecha
2006-02-01Registro en:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Volume: 365 Issue: 4 Pages: 1215-1219 Published: FEB 1 2006
0035-8711
Autor
Zamanov, R. K.
Bode, Michael
Melo, C. H. F.
Porter, J.
Gomboc, A.
Konstantinova Antova, R.
Institución
Resumen
We have measured the rotational velocities (v sin i) of the mass donors in a number of D'-type symbiotic stars (SSs), using the cross-correlation function method. Four out of five D' SSs with known v sin i appeared to be very fast rotators compared with the catalogues of v sin i for the corresponding spectral types. At least three of these stars rotate at a substantial fraction (greater than or similar to 0.5) of the critical velocity. This means that at least in D'-type SSs the cool components rotate faster than isolated giants. If these binary stars are synchronized, their orbital periods should be relatively short (4-60 d). We also briefly discuss the possible origin of the rapid rotation and its connection with mass loss and dust formation.