J/A+A/596/A44 Tr16-22. V and V/I Stokes parameters (Naze+, 2016)
The puzzling properties of the magnetic O star Tr16-22.
Naze Y., Barba R., Bagnulo S., Morrell N., Gamen R., Petit V., Neiner C.
<Astron. Astrophys. 596, A44 (2016)>
=2016A&A...596A..44N 2016A&A...596A..44N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, early-type ; Magnetic fields
Keywords: stars: early-type - X-rays: stars - stars: individual: Tr16-22 -
stars: magnetic field
Abstract:
The detection of bright, hard, and variable X-ray emission in Tr16-22
prompted spectropolarimetric observations of this star, which in turn
led to the discovery of a surface magnetic field.
We want to further constrain the properties of this star, in
particular to verify whether X-ray variations are correlated to
changes in optical emission lines and magnetic field strength, as
expected from the oblique rotator model that is widely accepted for
magnetic O stars.
We have obtained new low-resolution spectropolarimetric and long-term
high-resolution spectroscopic monitoring of Tr16-22, and we also
analyse new, serendipitous X-ray data.
Description:
The following tables provide the I (2nd column) and V/I (3rd column)
values vs wavelength (1st column), for each FORS2 observation of 2015.
They are raw, i.e. not shifted for heliocentric correction, not
rectified, not filtered by line-selecting masks, not filtered for
deviant points... (see Sect. 2.2 of the paper for details on the
reduction and subsequent analysis) to permit re-analysis. However, the
authors advice anyone interested doing so to rather reduce the data
from scratch (data are available in the ESO archive). Note also that
the I was not flat-fielded, as needed for the analysis (see Sect. 2.2).
Objects:
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RA (2000) DE Designation(s)
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10 45 08.22 -59 46 07.0 Tr 16-22 = Cl Trumpler 16 22
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 41 7 List of observation files
files/* . 7 Individual observation files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- FileName Name of the file in subdirectory files
16-41 A26 --- Title Title of the file
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Byte-by-byte Description of file: files/*
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda Wavelength
9- 18 F10.2 --- I Stokes I
20- 34 F15.9 --- V/I Stokes V/I
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Acknowledgements:
Yael Naze, ynaze(at)uliege.be
(End) Patricia Vannier [CDS] 30-Sep-2016