Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Acta Astronomica

2 Smak J.

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: stars: individual: Z Cha

Sortuj według:

Ogranicz wyniki do:

Stream Overflow in Z Cha and OY Car during Quiescence

Smak J.

Acta Astronomica

2012

Vol. 62, No. 2

213--217

Eclipses of the hot spot in Z Cha and OY Car observed by many authors during their quiescence are re-analyzed. Distances of the spot from the center of the disk rs are determined from phases of ingress and egress. In the case of several eclipses of Z Cha and nearly all eclipses of OY Car it is found that r_s(egress)s(ingress). This is interpreted as being due to the effects of stream overflow and implies that those values of r_s are not representative for the radius of the disk r_d. The r_s(ingress)-dt relations (where dt is the time since last outburst) are improved when points affected by the stream overflow are omitted.

Enhanced Mass Transfer in Dwarf Novae of the SU~UMa Type During Their Outbursts and Superoutbursts

Smak J.

Acta Astronomica

2004

Vol. 54, No. 3

221--231

Observational data for five dwarf novae of the SU UMa type provide several strong arguments in favor of a significant enhancement in the mass transfer rate during their outbursts and superoutbursts. The mass transfer rates during normal outbursts are estimated from the amount of accreted mass assuming the theoretical mass transfer rate at quiescence, based on models involving gravitational waves. The resulting rates Menh≈0.6-1.8×1017 g/s imply enhancement by a factor of 15-46, which is consistent with observational evidence for VW Hyi and with theoretical predictions. The mass transfer rates during superoutbursts are enhanced to Menh≈3-6×1017 g/s. The corresponding enhancement ratios range from ≈20-60 (when the mass transfer rates at quiescence are obtained under assumption of no enhancement during normal outbursts) up to ≈100 (resulting from the assumption of the theoretical mass transfer rate during quiescence).