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J/A+A/611/A69       B,V and R band polarimetry of lambda Tau  (Berdyugin+, 2018)

High-precision broad-band polarimetry of early-type binaries. II. Variable, phase-locked polarization in triple Algol-type system lambda Tauri. Berdyugin A., Piirola V., Sakanoi T., Kagitani M., Yoneda M. <Astron. Astrophys. 611, A69 (2018)> =2018A&A...611A..69B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Polarization Keywords: polarization - scattering - binaries: eclipsing - techniques: polarimetric - circumstellar matter Abstract: Linear polarization measurements of lambda Tau in the B, V and R passbands with the high-precision Dipol-2 polarimeter have been carried out. The data have been obtained on the 60cm KVA (Observatory Roque de los Muchachos, La Palma, Spain) and Tohoku 60cm (Haleakala, Hawaii, USA) remotely controlled telescopes during 69 observing nights. Optical polarimetry revealed small intrinsic polarization with ∼0.05% peak to peak variation over the orbital period of ∼3.95d. Variability pattern is typical for binary systems showing strong second harmonic of the orbital period. We apply a standard analytical method and our own light scattering models to derive parameters of the inner binary orbit from the fit to the observed variability of the normalized Stokes parameters. Analytic and numerical modelling codes are used to interpret the data. Description: Obtained polarization data of lambda Tau in the form of the normalized Stokes parameters q and u are presented for the B, V and R passbands. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 04 00 40.82 +12 29 25.2 lambda Tau = HR 1239 --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file poldata.dat 97 69 Polarization data for the B, V and R passbands
Byte-by-byte Description of file: poldata.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d JD Heliocentrical Julian Date 15- 20 F6.4 --- Phase Orbital phase (1) 23- 28 F6.4 --- q(B) Stokes q for B band 31- 37 F7.4 --- u(B) Stokes u for B band 40- 45 F6.4 --- e_q(B) Error of q(B) and u(B) 49- 54 F6.4 --- q(V) Stokes q for V band 57- 63 F7.4 --- u(V) Stokes u for V band 66- 71 F6.4 --- e_q(V) Error of q(V) and u(V) 75- 80 F6.4 --- q(R) Stokes q for R band 83- 89 F7.4 --- u(R) Stokes u for R band 92- 97 F6.4 --- e_q(R) Error of q(R) and u(R)
Note (1): The phase of the orbital period was computed with the ephemeris JD(pr.min)=2455577.3203+3.952948d.
Acknowledgements: Andrei Berdyugin, andber(at)utu.fi
(End) Andrei Berdyugin [Turku Univ., Finland] Patricia Vannier [CDS] 08-Jan-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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