1999A&A...352..239M


Query : 1999A&A...352..239M

1999A&A...352..239M - Astronomy and Astrophysics, volume 352, 239-247 (1999/12-1)

The dwarf nova RZ Leonis: photometric period, "anti-humps" and normal alpha disc.

MENNICKENT R.E., STERKEN C., GIEREN W. and UNDA E.

Abstract (from CDS):

We present results of differential photometry of the dwarf nova RZ Leonis spanning a 11-year baseline. The most striking feature of the light curve is a non-coherent periodic hump of variable amplitude. A seasonal time series analysis yields a photometric period of 0.0756(12)d. In addition, low amplitude fluctuations of the mean magnitude in time scale of months are observed. We find that the hump's amplitude is anti-correlated with the star's mean magnitude and becomes ``negative" (i.e. an absorption feature or ``anti-hump") when the system is very faint. Secondary humps and ``anti-humps" are also observed. The transition from ``anti-humps" to fully developed humps occurs on a time scale of 70 days. We interprete the observations as a rapid response of the accretion disk to the increase of mass transfer rate. In this case we deduce a viscosity parameter α∼0.08, i.e. much larger than often claimed for WZ Sge-like stars. We note that the secondary star in RZ Leo is close to a main-sequence red dwarf and not a brown-dwarf like star as suggested for other long cycle-length SU UMa stars like WZ Sge and V592 Her. Our results indicate that large amplitude and long cycle length dwarf novae might not necessarily correspond to objects in the same evolutive stage.

Abstract Copyright:

Journal keyword(s): stars: individual: RZ Leo - stars: novae, cataclysmic variables - stars: fundamental parameters - stars: evolution - stars: binaries: general

Nomenclature: Fig.1: [MSG99] CN (Nos C1-C4).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* WX Cet CV* 01 17 04.17 -17 56 23.0           ~ 165 0
2 V* U Gem CV* 07 55 05.2324414746 +22 00 05.044127985   15.3 14.54     DA 1075 0
3 V* EG Cnc CV* 08 43 03.9863206560 +27 51 49.693595508           DAe 169 0
4 V* RZ Leo CV* 11 37 22.2524330304 +01 48 58.617459936     19.6     DA+dM2 152 0
5 V* AL Com CV* 12 32 25.7951754648 +14 20 42.292188276     16.2     ~ 240 0
6 V* V592 Her No* 16 30 56.400 +21 16 58.49           ~ 52 0
7 V* V2051 Oph CV* 17 08 19.0873634976 -25 48 31.704262776   17.5       ~ 237 0
8 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20     DAepv 914 0
9 V* IP Peg CV* 23 23 08.5362249504 +18 24 59.206884012           M2 369 0
10 [M96a] RZ Leo star 2 * ~ ~   14.888 14.201     ~ 2 0

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2022.05.24-08:33:06

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