Naslov
Abell-35 phenomena in symbiotic stars: discovery of 1.2 and 6.4 day periods in vv8 (v471 per)

Autori
Munari, U. ; Siviero, A. ; Tamajo, Ettore ; Fiaschi, M. ; Dallaporta, S. ; Cherini, G. ; Frigo, A. ; Castellani, F. ; Graziani, M. ; Moretti, S. ; Tomaselli, S.

Izvornik
Baltic astronomy (1392-0049) 21 (2012), 1/2; 180-183

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
planetary nebulae: central star – stars: symbiotic binaries – common envelope

Sažetak
We are collected high precision (median value of total error bud- get 0.008, 0.006, 0.006, 0.004 mag for B, V , RC, IC bands, respectively) opti- cal photometry of VV8, so far 782 individual observing runs uniformly dis- tributed over the period 2005-2011. This data set allows us to refine the known long periodicity of VV8 to P=16.8 yr, with peak-to-valley amplitudes of
B=0.18 and
V=0.14 mag. In addition, we have discovered two new period- icities: 6.431 day (total amplitude
B=
V=
I=0.05 mag) and 1.184882 day (
B=0.022,
V=0.018,
I=0.014 mag). These two short periods are reminis- cent of the Abell-35 phenomena displayed by binary nuclei of planetary nebulae that have gone through a common envelope phase. Twice the 6.431 day period would nicely correspond to the double-peaked light-curve that the G5III star in VV8 would display if ellipsoidally distorted by filling its Roche lobe.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je prezentiran na skupu ASIAGO Meeting on symbiotiy stars, održanom od 10.-11.2011., Padova, Italija.

POVEZANOST RADA