J/ApJS/141/469 Linear polarization catalog toward HD 62542 (Pereyra+, 2002)
Polarimetry toward the IRAS Vela shell. I. The catalog.
Pereyra A., Magalhaes A.M.
<Astrophys. J. Suppl. Ser. 141, 469 (2002)>
=2002ApJS..141..469P 2002ApJS..141..469P
ADC_Keywords: Polarization ; Magnetic fields ; Interstellar medium
Keywords: catalogs - ISM: clouds - ISM: individual (Gum Nebula, Vela Shell) -
ISM: magnetic fields - polarization - stars: individual (HD 62542)
Abstract:
We have obtained linear polarization measurements of stars along the
western side of the IRAS Vela Shell toward HD 62542. From 16 CCD
fields distributed along the ionization front (I-front) we have built
a catalog of 856 objects with polarization signal-to-noise ratio
larger than 10. We detect very significant levels of polarization and
hence an appreciable magnetic field throughout the region. Composite
polarization maps around the I-front are shown. In some regions the
polarization vectors are parallel to the I-front, but a perpendicular
trend is also evident along parts of the front. In addition, the
polarization pattern seems to be affected by gas streaming inside the
cloud.
The observations were made using a CCD imaging polarimeter attached to
the 1.5m Telescope of Cerro Tololo Inter-American Observatory (CTIO),
Chile. The data were collected in 1991 December and 1992 December.
Table 1: CCD Field Positions
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Field RA (J2000) DE Obs. Date
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01 7 42 37.08 -42 13 44.66 Dec. 1991
02 7 42 01.22 -42 07 02.30 Dec. 1991
03 7 41 25.31 -42 02 02.93 Dec. 1991
04 7 43 12.93 -42 20 25.03 Dec. 1991
05 7 38 59.84 -41 36 55.29 Dec. 1992
06 7 39 32.15 -41 28 59.42 Dec. 1992
07 7 40 03.96 -41 36 59.53 Dec. 1992
08 7 40 03.70 -41 44 59.52 Dec. 1992
09 7 40 35.51 -41 53 01.63 Dec. 1992
10 7 42 11.43 -42 01 06.96 Dec. 1992
11 7 42 10.92 -42 17 07.95 Dec. 1992
12 7 42 42.72 -42 25 11.05 Dec. 1992
13 7 42 10.66 -42 25 07.94 Dec. 1992
14 7 41 06.41 -42 29 03.71 Dec. 1992
15 7 40 09.39 -42 56 59.98 Dec. 1992
16 7 39 36.94 -43 08 58.84 Dec. 1992
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 75 875 Field data
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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- 5 A5 --- --- [Field]
7- 12 A6 --- [PM2002] Name (FF NNN) (1)
14- 18 A5 --- --- [Field]
20- 25 A6 --- [PM2002]2 Second designation in an other field
27- 28 I2 h RAh Hour of Right Ascension (J2000)
30- 31 I2 min RAm Minute of Right Ascension (J2000)
33- 37 F5.2 s RAs Second of Right Ascension (J2000)
39 A1 --- DE- Sign of the Declination (J2000)
40- 41 I2 deg DEd Degree of Declination (J2000)
43- 44 I2 arcmin DEm Arcminute of Declination (J2000)
46- 50 F5.2 arcsec DEs Arcsecond of Declination (J2000)
52- 56 F5.3 % PolV Percent linear polarization in the V band
58- 62 F5.3 % e_PolV Measured error in PolV (2)
64- 68 F5.1 deg PA Polarization angle (3)
70- 74 F5.2 mag Vmag The V band magnitude
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Note (1): Designation:
[PM2002] FF NNN, where
FF is the number of the field and
NNN the number of the object in the field
Note (2): The latter are obtained from the residuals of the observations
at each waveplate position angle (ψi) with respect to the
expected cos4ψi curve; they are consistent with the photon noise
errors (Magalhaes, Benedetti & Roland, 1984PASP...96..383M 1984PASP...96..383M).
Note (3): Measured from North to East.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-Sep-2002