C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST04:27:34

2012A&A...538A..59P - Astronomy and Astrophysics, volume 538A, 59-59 (2012/2-1)

Polarimetry of the binary PDS 144.


Abstract (from CDS):

Our goal is to study the circumstellar environment associated with each component of the wide intermediate-mass pre-main sequence binary system PDS 144 using broadband polarimetry. We present near-infrared (NIR) linear polarimetric observations of PDS 144 gathered with the IAGPOL imaging polarimeter along with the CamIV infrared camera at the Observatorio do Pico dos Dias (OPD). In addition, we re-analyzed OPD archive optical polarization to separate the binary and estimate the interstellar polarization using foreground stars. After discounting the interstellar component, we found that both stars of the binary system are intrinsically polarized. The polarization vectors at optical and NIR bands of both components are aligned with the local magnetic field and the jet axis. These findings indicate an interplay between the interstellar magnetic field and the formation of the binary system. We also found that the PDS 144N is less polarized than its southern companion in the optical. However, in the NIR PDS 144N is more polarized. Our polarization data can only be explained by high inclinations (i>80°) for the disks of both members. In particular, comparisons of our NIR data with young stellar objects disk models suggest predominantly small grains in the circumstellar environment of PDS 144N. In spite of the different grain types in each component, the infrared spectral indexes indicate a coeval system. We also found evidence of coplanarity between the disks.

Abstract Copyright:

Journal keyword(s): circumstellar matter - polarization - stars: pre-main sequence - stars: individual: PDS 144

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 CD-25 11111A TT* 15 49 15.3254009805 -26 00 54.700830998   13.37 12.81 12.73   A5Ve 27 0
2 CD-25 11111 ** 15 49 15.3888 -26 00 52.452           A5Ve+A2IVe 25 0
3 CD-25 11111B TT* 15 49 15.526320 -26 00 50.11812   13.37 12.81 14.02   A2IVe 25 0

    Equat.    Gal    SGal    Ecl

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