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Home All issues Volume 584 (December 2015) A&A, 584 (2015) A40 Full HTML
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Table 5

Parameters of the light curve solution of J2256 in 2013−2014.

Parameter B 1 B 2 V 1 V 2 R 1 R 2 I 1 I 2
JD 2 456 000+ 540 594 537 596 538 631 541 897
N 77 72 68 75 87 88 89 80
q = Mwd/Mred 1.004 ± 0.013
i, ° 78.8 ± 0.1
⟨ Rred ⟩, a0 0.3903(14)
ξ, a0 0.5004(13)
Tred, K 3151 ± 78 3488 ± 56 3187 ± 27 3143 ± 51 3183 ± 18 3208 ± 24 3120 ± 9 3200 ± 24
m opt 14.9 14.4 14.9 14.4
Fopt, conditional units 34.07 26.38 14.96 7.929
White dwarf
R wd 0.0227(2)ξ = 0.0114(1)a0
Twd, K 22 720 ± 110
Accretion disk
e 0.004(1) 0.006(4) 0.074(6) 0.058(5) 0.044(6) 0.055(3) 0.076(1) 0.090(6)
Rd, ξ 0.646(1) 0.649(7) 0.663(3) 0.637(10) 0.576(6) 0.608(2) 0.594(2) 0.715(11)
R d / a 0 0.3218 0.323 0.309 0.302 0.276 0.288 0.276 0.328
a, a0 0.3218(3) 0.323(3) 0.309(1) 0.302(4) 0.276(3) 0.288(1) 0.276(9) 0.328(5)
0.5βd,° 0.8(1) 0.8(1) 1.3(1) 1.4(1) 2.1(1) 2.1(1) 1.8(1) 1.3(1)
αe, ° 129.5(2) 116(2) 173(1) 166(2) 121(2) 112(2) 174(1) 160(4)
α g 0.543(3) 0.583(2) 0.532(2) 0.564(3) 0.492(2) 0.511(2) 0.496(2) 0.485(3)
⟨ Tin ⟩, K 38 180 ± 180 41 834 ± 228 36 215 ± 165 39 293 ± 220 36 395 ± 154 38 064 ± 217 35 839 ± 166 37 578 ± 215
Hot spot
R hl / a 0 0.069 0.0613 0.1191 0.104 0.1136 0.153 0.139 0.161
Rhl, ° 12.3 10.9 22.1 19.7 23.6 30.4 28.9 28.1
R hs / a 0 0.159 0.1755 0.226 0.192 0.122 0.150 0.232 0.3095
Rhs, ° 28.3 31.1 41.9 36.4 25.3 29.8 48.2 54.1
Rsp/a0 = (Rhl + Rhs) /a0 0.228(13) 0.237(1) 0.346(11) 0.297(14) 0.236(22) 0.303(26) 0.371(9) 0.47(2)
Rsp/a0 = (Rhl + Rhs), ° 40.6 42.0 64.2 56.3 49.0 60.3 77.0 82.1
TU, K 11 325 ± 860 12 590 ± 1115 17 378 ± 1235 17 322 ± 1170 17 949 ± 1600 22 138 ± 1554 18 992 ± 374 24 880 ± 1570
0.5zsp, ° 1.3(2) 1.1(1) 1.4(1) 1.6(2) 2.3(2) 2.0(1) 1.9(1) 1.5(1)
Hot line
av, a0 0.0347(1) 0.0221(4) 0.070(3) 0.0521(2) 0.084(4) 0.117(6) 0.089(1) 0.103(2)
bv, a0 0.379(1) 0.348(10) 0.285(10) 0.308(6) 0.415(10) 0.416(10) 0.408(7) 0.367(5)
cv, a0 0.0045(5) 0.0047(3) 0.0083(5) 0.009(1) 0.0114(7) 0.0109(3) 0.0088(2) 0.0092(5)
Tww,max, K 17 330 ± 1960 16 755 ± 1350 15 305 ± 1993 14 580 ± 1882 16 762 ± 1100 14 092 ± 1088 15 199 ± 1173 16 026 ± 980
Tlw,max, K 16 890 ± 370 17 468 ± 1009 20 291 ± 992 20 817 ± 997 19 959 ± 1068 21 641 ± 1024 22 696 ± 309 27 397 ± 1293
β1, ° 31.5(1) 35.2(4) 26.5(2) 28.3(1) 16.4(2) 13.6(5) 19.7(1) 23.5(5)
1525 2267 2313 2710 1318 2252 1336 3636

Notes. N − number of average points of the light curve; Rd− radius of the disk at apoastron in units ξ (distance between the center of the white dwarf and L1) and in units a0; a, a0− main semi-axis of the disk in units of binary separation a0; 0.5βd− half thickness of the outer disk edge; ⟨ Tin ⟩− average temperatures of the internal disk region (boundary layer); Rhl− radius of the hot line (in the orbital plane) in units a0 and degrees; Rhs− size of the hot-spot part that is not covered by the hot line (in the orbital plane) in units a0 and degrees; Rsp− total radius of the hot spot in units a0 and degrees; TU− temperature of the gas stream axis; 0.5zsp− half thickness of the hot spot; av,bv,cv− hot line axes; Tww,max and Tlw,max− temperatures Thl of the windward and leeward sides of the gas stream near the disk (r = 0) according to (4); β1− the angle between the axis of the gas stream and the line connecting the mass centers of the components.

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