2020MNRAS.497.2175C

Query : 2020MNRAS.497.2175C

2020MNRAS.497.2175C - Mon. Not. R. Astron. Soc., 497, 2175-2189 (2020/September-2)

Phase-locked polarization by photospheric reflection in the semidetached eclipsing binary µ1 Sco.

COTTON D.V., BAILEY J., KEDZIORA-CHUDCZER L. and DE HORTA A.

Abstract (from CDS):

We report the detection of phase-locked polarization in the bright (mV = 2.98-3.24) semidetached eclipsing binary µ1 Sco (HD 151890). The phenomenon was observed in multiple photometric bands using two different HIPPI-class (HIgh Precision Polarimetric Instrument) polarimeters with telescopes ranging in size from 35 cm to 3.9 m. The peak-to-trough amplitude of the polarization is wavelength dependent and large, ∼700 ppm in green light, and is easily seen with even the smallest telescope. We fit the polarization phase curve with a SYNSPEC/VLIDORT polarized radiative transfer model and a Wilson-Devinney geometric formalism, which we describe in detail. Light from each star reflected by the photosphere of the other, together with a much smaller contribution from tidal distortion and eclipse effects, wholly accounts for the polarization amplitude. In the past, polarization in semidetached binaries has been attributed mostly to scattering from extra-stellar gas. Our new interpretation facilitates determining masses of such stars in non-eclipsing systems.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: individual: m 1 Sco - stars: binaries: close - radiative transfer - polarization - techniques: polarimetric

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 631 0
2 HD 5679 SB* 01 02 18.4439850768 +81 52 32.081564352   6.92 6.92     G2III:+B8/9 476 0
3 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1354 1
4 * bet Per SB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1265 1
5 * lam Tau SB* 04 00 40.8167738514 +12 29 25.239987626 2.66 3.29 3.41 3.44 3.53 B4IV 364 0
6 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1789 0
7 HD 48099 Be* 06 41 59.2308626256 +06 20 43.532571372 5.38 6.32 6.37 6.30 6.35 O5V((f))z+O9:V 310 0
8 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1610 0
9 HD 80558 s*b 09 18 42.3559197816 -51 33 38.338564212 6.15 6.47 5.93 5.36 4.94 B6Ia 124 0
10 * l Car cC* 09 45 14.8117044917 -62 30 28.450312664   5.09 3.75     G5Iab/b 343 0
11 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 605 1
12 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 973 0
13 HD 111613 sg* 12 51 17.9760267672 -60 19 47.240368104 6.00 6.10 5.72 5.32 5.03 B9.5Iab 123 0
14 * alf Vir bC* 13 25 11.57937 -11 09 40.7501 -0.20 0.74 0.97 1.06 1.30 B1V 877 1
15 V* BH CVn RS* 13 34 47.8087660104 +37 10 56.691826860 5.43 5.38 4.98 4.57 4.27 A6m 350 0
16 * alf Cen ** 14 39 36.50 -60 50 02.3   0.4 -0.1     G2V+K1V 1031 0
17 * alf Ser PM* 15 44 16.0741095811 +06 25 32.268792881 5.080 3.800 2.630 1.82 1.25 K2IIIbCN1 533 0
18 * omi Sco V* 16 20 38.1737722092 -24 10 09.495477665 5.99 5.40 4.57 3.69 2.93 A5II 269 0
19 V* U Her OH* 16 25 47.4719383584 +18 53 32.863368084 8.85 8.23 6.70     M6.5-8+e 563 1
20 HD 149404 s*b 16 36 22.5628499784 -42 51 31.902127776 5.23 5.88 5.52 6.90   O8.5Iab(f)p 265 0
21 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1908 0
22 NAME LHB X 16 42.0 +02 19           ~ 414 0
23 * mu.01 Sco Be* 16 51 52.2283548696 -38 02 50.638070400 1.98 2.82 2.98     B1V+B 305 0
24 * mu.02 Sco bC? 16 52 20.1453198 -38 01 03.125839 2.52 3.343 3.542     B2IV 161 0
25 HD 154445 * 17 05 32.2587926880 -00 53 31.437713328 5.10 5.73 5.61 5.39 5.34 B1V 276 0
26 V* U Oph SB* 17 16 31.7137908168 +01 12 37.998551304   5.941 5.921     B3V 388 1
27 * alf Oph ** 17 34 56.06945 +12 33 36.1346 2.32 2.22 2.07 1.93 1.85 A5IVnn 495 0
28 HD 160529 s*b 17 41 59.0261939376 -33 30 13.704456780 8.17 7.87 6.66 5.50 4.51 B8-A9Ia+ 203 1
29 HD 174237 Be* 18 46 43.0891606728 +52 59 16.654686648 5.06 5.80 5.90     B3+F5III 212 0
30 * bet Lyr SB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 955 0
31 * U Sge SB* 19 18 48.4082723376 +19 36 37.722978540 6.23 6.61 6.58     B7III+K1III 385 0
32 * eta Aql cC* 19 52 28.3689223781 +01 00 20.371980515 5.12 4.61 3.80   3.030 F6Iab+B9.8V 701 0
33 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
34 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 756 0
35 * 14 Cep SB* 22 02 04.5726270264 +58 00 01.309758516 4.77 5.551 5.542     O9IV(n)var+B1:V: 262 0
36 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.217   13.106   DA4.1 536 0
37 V* V373 Cas SB* 23 55 33.8386958472 +57 24 43.807358448 5.49 6.21 6.00     B0.5II+B3.5/4III/V 157 0

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