2006A&A...454..855P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:04:05

2006A&A...454..855P - Astronomy and Astrophysics, volume 454, 855-862 (2006/8-2)

Indirect imaging of an accretion disk rim in the long-period interacting binary W Crucis.

PAVLOVSKI K., BURKI G. and MIMICA P.

Abstract (from CDS):

Light curves of the long-period Algols are known for their complex shape (asymmetry in the eclipse, light variations outside the eclipse, changes from cycle-to-cycle), but their interpretation is not possible in the standard model of binary stars. We determined that complex structures present in these active Algol systems could be studied with the eclipse-mapping method that was successfully applied to the new 7-color photometric observations in the Geneva system of W Cru, belonging to the isolated group of these active Algols. Several cycles of this long-period (198.5days) eclipsing binary were covered by observations. We used a modified Rutten's approach to the eclipse-mapping. The optimization of the system's parameters and the recovery of the disk intensity distribution are performed using a genetic algorithm (GA). The finding of a primary (hot) component is hidden in thick accretion disk confirms previous solutions. The mass of the primary component, M1=8.2M, indicates that it is a mid-B type star. The mass-losing component fills its critical lobe, which, for the system's parameters, means it is a G-type supergiant with a mass M2=1.6M. The disk is very extended geometrically, and its outer radius is about 80% of the primary's critical lobe. A reconstructed image reveals the rather clumpy and nonuniform brightness distribution of an accretion disk rim in this system that is seen almost edge-on. This clumpiness accounts for light curve distortions and asymmetries, as well as for secular changes.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - accretion, accretion disks - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/454/855): table1.dat>

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 - 2020
#notes
1 HD 232121 Al* 00 10 42.0679098681 +54 53 29.360355721   9.67       B5+K3III 172 0
2 V* RX Cas bL* 03 07 45.7481570255 +67 34 38.614798549   10.14 8.64     K1III+A5eIII 173 0
3 V* UU Cnc bL* 08 02 30.8976311335 +15 10 41.915044498   10.38 8.85 8.1   K4III 65 0
4 HD 101021 PM* 11 37 00.5237073388 -61 17 00.397363559   6.27 5.15     K0III 38 0
5 V* W Cru bL* 12 11 59.1618206802 -58 47 00.737393202   9.47 8.44     F8/G1Ia/abe 90 0
6 V* W Ser Al* 18 09 50.6487890730 -15 33 00.269169421   9.64 8.42     F8/G2Iaep(+A) 128 0
7 V* RZ Oph Al* 18 45 46.3797130544 +07 13 12.287281203   11.00 10.00     F3Ibe 98 0
8 V* V356 Sgr Al* 18 47 52.3313273686 -20 16 28.244431656   7.07 6.99     B9III 163 0
9 * bet Lyr bL* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 886 0
10 V* V367 Cyg bL* 20 47 59.5848515369 +39 17 15.722701131 8.080 7.680 6.990     A3Ibep 197 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:04:05

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