J/MNRAS/476/4442 Polarization of seven MBM clouds stars (Neha+, 2018)
Polarization of seven MBM clouds at high Galactic latitude.
Neha S., Maheswar G., Soam A., Lee C.W.
<Mon. Not. R. Astron. Soc., 476, 4442-4458 (2018)>
=2018MNRAS.476.4442N 2018MNRAS.476.4442N (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Magnetic fields ; Polarization
Keywords: polarization - ISM: clouds - ISM: individual objects: MBM 33-39 -
ISM: magnetic fields
Abstract:
We made R-band polarization measurements of 234 stars towards the
direction of the MBM 33-39 cloud complex. The distance of the MBM
33-39 complex was determined as 120±10pc using polarization results
and near-infrared photometry from the 2MASS survey. The magnetic field
geometry of the individual clouds inferred from our polarimetric
results reveals that the field lines are in general consistent with
the global magnetic field geometry of the region obtained from
previous studies. This implies that the clouds in the complex are
permeated by the interstellar magnetic field. Multi-wavelength
polarization measurements of a few stars projected on to the complex
suggest that the size of the dust grains in these clouds is similar to
those found in the normal interstellar medium of the Milky Way. We
studied a possible formation scenario of the MBM 33-39 complex by
combining the polarization results from our study with those from the
literature and by identifying the distribution of ionized, atomic and
molecular (dust) components of material in the region.
Description:
Polarimetric observations were made using the Aries Imaging
Polarimeter (AIMPOL). This polarimeter is used as a back-end
instrument at the Cassegrain focus of the 104-cm Sampurnanand
Telescope, which is at the Aryabhatta Research Institute of
Observational Sciences (ARIES), Nainital, India.
We also observed a few bright stars towards MBM 33, MBM 34 and MBM 35
in multi-wavelengths (V, R and I).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 100 30 Polarization of observed Tycho stars in the
VRI filters
table7.dat 59 234 Polarization results of 234 stars observed in
the direction of the MBM 33-39 cloud complex
with P/σP≥2
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Cluster Cluster name, MBM 33, MBM 34 and MBM 35
8- 9 I2 --- Star [1/30] Star ID
11- 20 F10.6 deg RAdeg Right ascension (J2000)
22- 30 F9.6 deg DEdeg Declination (J2000)
32- 34 F3.1 % PV Polarisation degree in V band
36- 38 F3.1 % e_PV rms uncertainty on PV
40- 41 I2 deg thetaV Polarisation angle in V band
43 I1 deg e_thetaV rms uncertainty on thetaV
45- 47 F3.1 % PR Polarisation degree in R band
49- 51 F3.1 % e_PR rms uncertainty on PR
53- 54 I2 deg thetaR Polarisation angle in R band
56 I1 deg e_thetaR rms uncertainty on thetaR
58- 60 F3.1 % PI Polarisation degree in I band
62- 64 F3.1 % e_PI rms uncertainty on PI
66- 68 I3 % thetaI Polarisation angle in I band
70 I1 % e_thetaI rms uncertainty on thetaI
72- 75 F4.2 % lambdamax Wavelenght of maximum degree of polarization
77- 80 F4.2 % e_lambdamax rms uncertainty on lambdamax
82- 85 F4.2 um Pmax Maximum degree of polarization as a percentage
at wavelength lambdamax
87- 90 F4.2 um e_Pmax rms uncertainty on Pmax
92- 95 F4.2 -- RV Total-to-selective extinction
97-100 F4.2 --- e_RV rms uncertainty on RV
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Star [1/234] Star ID
5- 14 F10.6 deg RAdeg Right ascension (J2000)
16- 24 F9.6 deg DEdeg Declination (J2000)
26- 32 F7.3 deg GLON Galactic longitude
34- 39 F6.3 deg GLAT Galactic latitude
41- 43 F3.1 % P Degree of polarization
45- 48 F4.2 % e_P rms uncertainty on P
50- 52 I3 deg theta Polarization position angle
54- 55 I2 deg e_theta rms uncertainty on theta
57- 59 I3 deg thetaGal Galactic polarization position angle
measured from Galactic North
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Apr-2021