Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1314...45v&link_type=abstract
INTERNATIONAL CONFERENCE ON BINARIES: In celebration of Ron Webbink's 65th Birthday. AIP Conference Proceedings, Volume 1314, p
Physics
Spectroscopic Binaries, Radiative Transfer, Accretion Disks, Brightness, Spectroscopic Binaries, Close Binaries, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Accretion And Accretion Disks, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification
Scientific paper
It has been established that Algols, issuing from a binary with a B-type primary at birth, show more observed systems at large mass ratios than calculated with the conservative assumption, where no mass and angular momentum leaves the system. We have introduced in the Brussels binary evolutionary code the spinning up of the gainer caused by impacting mass coming from the donor when the latter fills up its Roche volume. This impacting matter creates moreover a hot spot at the area of impact. When the kinetic energy of fast rotation added to the radiative energy of the hot spot is larger than the binding energy, a fraction of the transferred matter leaves the system. Our calculations have been performed on a large number of binaries during hydrogen core burning of the donor (case A) as well as during its hydrogen shell burning (case B). The evolutionary tracks are available as a catalog at the CDS in Strasbourg. Our calculations show that binaries with a late B-primary at birth evolve almost conservatively, whereas those with an early B-type primary blow matter into interstellar space during short lasting eras of fast mass transfer. The obtained calculated distribution of mass ratios now fits the observations a little bit better. The obtained calculated distribution of orbital periods fits the observations well.
de Greve Jean-Pierre
de Loore Bert
Jansen Kim
Mennekens Nicki
van Rensbergen Walter
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