J/A+AS/131/401 Southern peculiar early-type stars polarimetry (Yudin+ 1998)
Polarimetry of southern peculiar early-type stars
Yudin R.V., Evans A.
<Astron. Astrophys. Suppl. Ser. 131, 401 (1998)>
=1998A&AS..131..401Y 1998A&AS..131..401Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, early-type ; Polarization
Keywords: polarization - circumstellar matter - stars: emission-line; Be -
stars: pre-main sequence
Abstract:
We present and discuss optical polarimetry of a large group
(60 objects) of peculiar early-type stars (Herbig Ae/Be stars and
candidate members, B[e] stars, extreme emission line objects etc.).
Most were taken from ``A new catalogue of members and candidate
members of Herbig Ae/Be stellar group'' The et al. (1994,
Cat. J/A+AS/104/315). For 40 out of the 60 objects polarization was
measured for the first time. On the basis of the data we draw
conclusions about the circumstellar shell configuration and
orientation for several objects. Polarimetric variability on different
time-scales (minutes...hours...days) was investigated, as well as
comparison with earlier measurements to investigate variability over
longer time-scales. No circular polarization was detected to a
5σ level in most of the investigated stars. Polarimetric data
obtained here as well as data available from the literature were
analyzed from the point of investigating the evolutionary status of
the objects. The relationship between the polarimetric and photometric
data was also investigated.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 35 59 Star positions
tables.dat 94 786 Polarimetry
tab6-11.tex 95 589 LaTeX version of tables 6 to 11
tab12-16.tex 97 434 LaTeX version of tables 12 to 16
tab17-22.tex 95 561 LaTeX version of tables 17 to 22
tab6-11.ps 72 1147 PostScript version of the tables (Part. 1)
tab12-16.ps 72 1110 PostScript version of the tables (Part. 2)
tab17-22.ps 72 1143 PostScript version of the tables (Part. 3)
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See also:
J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 22 F4.1 s RAs Right ascension (J2000.0)
24 A1 --- DE- Declination sign
25- 26 I2 deg DEd Declination (J2000.0)
28- 29 I2 arcmin DEm Declination (J2000.0)
31- 32 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 24 F13.5 d HJD Julian date of the middle of observation
26- 29 A4 --- Filt Filter used
31- 34 I4 s Tint Basic integration time for the corresponding
filter
36- 37 I2 --- Nint Number of integrations from which the values
were obtained
39- 44 F6.3 % Plin Linear polarisation
46- 50 F5.3 % e_Plin rms uncertainty on Plin
52- 56 F5.1 deg PA Equatorial position angle
58- 61 F4.1 deg e_PA rms uncertainty on PA (North through East)
63- 66 F4.1 deg sigma1 Internal error in PA (1)
68- 73 F6.3 % U U Stokes parameter (x100)
75- 80 F6.3 % Q Q Stokes parameter (x100)
82- 88 F7.3 % Pcirc Circular polarization
90- 94 F5.3 % e_Pcirc rms uncertainty on Pcirc
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Note (1): Internal error calculated from photon counting statistics
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Acknowledgements: Ruslan Yudin
(End) Patricia Bauer [CDS] 06-Apr-1998