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J/A+A/383/580    BV polarimetric variability of 3 O-type stars   (Clarke+, 2002)

On the polarimetric variability of bright O-type stars. Clarke D., McDavid D., Smith R.A., Henrichs H.F. <Astron. Astrophys. 383, 580 (2002)> =2002A&A...383..580C
ADC_Keywords: Stars, O ; Stars, bright ; Polarization Keywords: polarization - stars: early-type - stars: individual: ξ Per - stars: individual: λ Cep - stars: individual: 68 Cyg Abstract: Polarimetric data associated with multi-parameter observational campaigns of selected bright O-type stars and their variable winds, are analysed in relation to the outcomes of the UV and optical spectroscopic studies. For the stars ξ Per and λ Cep, individual measurement uncertainties are Δp~±0.0002 with nightly mean uncertainties of Δp~±0.00007. Although variability is apparent on a night-to-night basis, with differences in Δp∼0.0002, no correlations are found between these and the periodic behaviours associated with the stellar SiIV and Hα lines. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 03 58 57.9 +35 47 28 xi Per = HR 1228 22 11 30.6 +59 24 52 lambda Cep = HR 8469 21 18 27.2 +43 56 45 68 Cyg = HR 8154 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablev.dat 64 48 Polarimetric data (V-band) from the 1991 October campaign for ξ Per, λ Cep and 68 Cyg tableb.dat 64 125 Polarimetric data (B-band) form the 1989 October campaign for ξ Per and λ Cep tables.tex 77 249 LaTeX version of the tables
See also: J/A+AS/116/257 : Variability in O-stars wind (Kaper+, 1996) Byte-by-byte Description of file: tableb.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Star Star name (1) 14- 25 F12.4 d HJD Heliocentric Julian date 28- 33 F6.3 % q Normalised Stokes parameter, q 35- 40 F6.3 % u Normalised Stokes parameter, u 42- 46 F5.3 % p(B) Degree of polarization 48- 52 F5.3 % e_p(B) rms uncertainty on p(B) (G1) 54- 59 F6.2 deg theta Vibration direction, θ relative to the standard equatorial frame 61- 64 F4.2 deg e_theta rms uncertainty on theta (G1)
Note (1): For ξ Per, data measured in the B-band (with the addition of a 10% neutral density filter)
Byte-by-byte Description of file: tablev.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Star Star name 14- 25 F12.4 d HJD Heliocentric Julian date 28- 33 F6.3 % q Normalised Stokes parameter, q 35- 39 F5.3 % e_q rms uncertainty on q 41- 46 F6.3 % u Normalised Stokes parameter, u 48- 52 F5.3 % e_u rms uncertainty u 54- 58 F5.3 % p(V) Degree of polarization (G1) 60- 64 F5.3 % e_p(V) rms uncertainty on p(V)
Global Notes: Note (G1): Estimates for the uncertainty of the p(B) and θ based on the photon count associated with the individual measurement set.
Acknowledgements: David Clarke
(End) Patricia Bauer [CDS] 20-Dec-2001
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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