J/MNRAS/405/2570 Linear polarization of nearby bright stars (Bailey+, 2010)
The linear polarization of nearby bright stars measured at the parts per
million level.
Bailey J., Lucas P.W., Hough J.H.
<Mon. Not. R. Astron. Soc., 405, 2570-2578 (2010)>
=2010MNRAS.405.2570B 2010MNRAS.405.2570B
ADC_Keywords: Stars, nearby ; Polarization
Keywords: polarization - techniques: polarimetric - ISM: magnetic fields
Abstract:
We report observations of the linear polarization of a sample of 49
nearby bright stars measured to sensitivities of between ∼1 and
∼4x10-6. The majority of stars in the sample show measurable
polarization, but most polarizations are small with 75 per cent of the
stars having P<2x10-5.
Description:
The observations were obtained with the PlanetPol polarimeter mounted
on the 4.2-m aperture William Herschel Telescope (WHT) which is
located at the Observatorio de Roque de Los Muchachos (ORM) at La
Palma in the Canary Islands. The bulk of the measurements described
here were obtained over the period 2005 April 25 to May 9.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 49 Properties of sample stars
table2.dat 42 35 Previous polarization measurements
table3.dat 66 49 Planetpol linear polarization measurements
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See also:
II/226 : Stellar polarization catalogs agglomeration (Heiles, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HR HR number
6- 25 A20 --- OName Other names
26- 30 F5.2 mag Vmag V magnitude
32- 39 A8 --- SpType MK spectral type
41- 44 F4.1 pc Dist Heliocentric distance
46- 47 I2 h RAh Right ascension (J2000)
49- 50 I2 min RAm Right ascension (J2000)
52 A1 --- DE- Declination sign (J2000)
53- 54 I2 deg DEd Declination (J2000)
56- 57 I2 arcmin DEm Declination (J2000)
59- 63 F5.1 deg GLON Galactic longitude
65- 68 F4.1 deg GLAT Galactic latitude
70 A1 --- l_vsini Limit flag on vsini
71- 73 I3 km/s vsini ? Rotational velocity
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HR HR number
6- 10 F5.3 % Pol ? Polarization (Heiles, 2000, Cat. II/226)
12- 16 F5.3 % e_Pol ? rms uncertainty on PH
18- 20 I3 10-5 Q/I.T ? Q/I Stokes parameter
(Tinbergen, 1982A&A...105...53T 1982A&A...105...53T)
22 I1 10-5 e_Q/I.T ? rms uncertainty on Q/IT
24- 26 I3 10-5 U/I.T ? U/I Stokes parameter
(Tinbergen, 1982A&A...105...53T 1982A&A...105...53T)
28 I1 10-5 e_U/I.T ? rms uncertainty on U/IT
30- 32 I3 10-5 Q/I.P ? Q/I Stokes parameter
(Piirola, 1977A&AS...30..213P 1977A&AS...30..213P)
34- 35 I2 10-5 e_Q/I.P ? rms uncertainty on Q/IP
37- 39 I3 10-5 U/I.P ? U/I Stokes parameter
(Piirola, 1977A&AS...30..213P 1977A&AS...30..213P)
41- 42 I2 10-5 e_U/I.P ? rms uncertainty on U/IP
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- HR HR number
6- 22 A17 --- Dates Date(s) of observation
23- 28 F6.1 10-6 Q/I Q/I Stokes parameter
30- 32 F3.1 10-6 e_Q/I rms uncertainty on Q/I
34- 39 F6.1 10-6 U/I U/I Stokes parameter
41- 43 F3.1 10-6 e_U/I rms uncertainty on U/I
45- 50 F6.1 10-6 Pol Polarisation (is calculated from
Pol=sqrt[(Q/I)2+(U/I)2])
52- 54 F3.1 10-6 e_Pol rms uncertainty on P
56- 60 F5.1 deg theta Polarisation position angle
62- 66 F5.1 deg e_theta rms uncertainty on theta
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Dec-2010