J/ApJ/698/2031 Polarimetry of HAeBe stars (Rodrigues+, 2009)
The alignment of the polarization of Herbig Ae/Be stars with the interstellar
magnetic field.
Rodrigues C.V., Sartori M.J., Gregorio-Hetem J., Magalhaes A.M.
<Astrophys. J., 698, 2031-2035 (2009)>
=2009ApJ...698.2031R 2009ApJ...698.2031R
ADC_Keywords: Polarization ; Stars, Be ; Interstellar medium ; YSOs
Keywords: stars: pre-main sequence - ISM: magnetic fields - polarization
Abstract:
We present a study of the correlation between the direction of the
symmetry axis of the circumstellar material around intermediate mass
young stellar objects and that of the interstellar magnetic field. We
use CCD polarimetric data on 100 Herbig Ae/Be stars. A large number of
them show intrinsic polarization, which indicates that their
circumstellar envelopes are not spherical. The interstellar magnetic
field direction is estimated from the polarization of field stars.
There is an alignment between the position angle of the Herbig Ae/Be
star polarization and that of the field stars for the most polarized
objects. This may be an evidence that the ambient interstellar
magnetic field plays a role in shaping the circumstellar material
around young stars of intermediate mass and/or in defining their
angular momentum axis.
Description:
We obtained polarimetric data on 102 fields containing probable HAeBe
stars selected from The et al. (1994, Cat. J/A+AS/104/315), Torres
(1999, C. A. O., Special Publ. 10 (Rio de Janeiro Observatorio
Nacional)), and Vieira et al. (2003, Cat. J/AJ/126/2971). The
observations were done with the 0.60m Boller & Chivens telescope at
the Observatorio do Pico dos Dias, Brazil, operated by the Laboratorio
Nacional de Astrofisica, Brazil from 1998 to 2002.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 102 104 Polarimetry of HAeBe objects
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See also:
J/ApJ/653/657 : Spectroscopic observations of Herbig Ae/Be stars (Manoj+,
2006)
J/AJ/129/856 : Herbig Ae/Be stars in nearby OB associations (Hernandez+,
2005)
J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)
J/A+AS/136/429 : Herbig Ae/Be stars candidates (Corporon+ 1999)
J/AJ/118/1043 : Herbig Ae/Be stars catalog (Herbst+, 1999)
J/AZh/73/194 : Circumstellar Disks of Ae/Be Herbig Stars (Grinin+ 1996)
J/A+AS/111/399 : Polarization variability in Herbig Ae/Be stars (Jain+, 1995)
J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)
J/AJ/106/656 : Herbig Ae/Be stars (Brooke+, 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Object name (see Ref and Note (2))
15 A1 --- f_Name Note about object (1)
17- 20 F4.1 mag Vmag Torres 1999/Simbad V band magnitude or B
band magnitude if flagged
22 A1 --- f_Vmag [B] B: means B-band magnitude
24- 26 I3 s Texp Exposure time
28- 37 A10 "YYYY/MM/DD" ObsDate UT date of the observation
39- 44 F6.3 % Pol Observed polarization
46- 50 F5.3 % e_Pol Error in ObPol
52- 56 F5.1 deg PolPA Observed polarization position angle
58- 61 I4 --- Nfg Number of foreground objects
63- 67 F5.3 % Pfg ? Foreground polarization
69- 73 F5.3 % e_Pfg ? Error in ForPol
75- 79 F5.1 deg PfgPA ? Foreground polarization position angle
81- 86 F6.3 % Pin ? Intrinsic polarization
88- 92 F5.3 % e_Pin ? Error in InPol
94- 98 F5.1 deg PinPA ? Intrinsic polarization position angle
100-102 A3 --- Ref References (2)
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Note (1): Flag as follows:
3 = The images of the field containing HD23302 and HD23480 do not include
objects with signal high enough to estimate the foreground polarization.
5 = PDS465 and PDS581 are post-AGB objects.
Note (2): References as follows:
1 = Vieira et al. (2003, Cat. J/AJ/126/2971; in Simbad);
2 = The et al. (1994, Cat. J/A+AS/104/315);
3 = Torres (1999, C. A. O., Special Publ. 10 (Rio de Janeiro Observatorio
Nacional)).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Jun-2011