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Mapping Circumstellar Magnetic Fields of Late-type Evolved Stars with the Goldreich-Kylafis Effect: CARMA Observations at λ1.3 mm of R Crt and R Leo

AuthorsHuang, Ko-Yun; Kemball, Athol J.; Vlemmings, Wouter H. T.; Lai, Shih-Ping; Yang, Louis; Agudo, Iván
KeywordsAsymptotic giant branch stars
Stellar magnetic fields
CO line emission
Circumstellar masers
Issue Date25-Aug-2020
PublisherIOP Publishing
CitationAstrophysical Journal 899(2): 152 (2020)
AbstractMapping magnetic fields is the key to resolving the unclear physical picture of circumstellar magnetic fields in late-type evolved stars. Observations of linearly polarized emission from thermal molecular line transitions due to the Goldreich-Kylafis (G-K) effect provide valuable insights into the magnetic field geometry in these sources that are complementary to other key studies. In this paper, we present the detection of spectral-line polarization from both the thermal J = 2-1 CO line and the v = 1, J = 5-4 SiO maser line toward two thermal-pulsating asymptotic giant branch stars, R Crt and R Leo. The observed fractional linear polarization in the CO emission is measured as m l ∼ 3.1% and m l ∼ 9.7% for R Crt and R Leo, respectively. A circumstellar envelope (CSE) model profile and the associated parameters are estimated and used as input to a more detailed modeling of the predicted linear polarization expected from the G-K effect. The observed thermal line polarization level is consistent with the predicted results from the G-K model for R Crt; additional effects need to be considered for R Leo. © 2020. The American Astronomical Society. All rights reserved.
Publisher version (URL)http://dx.doi.org/10.3847/1538-4357/aba122
Appears in Collections:(IAA) Artículos
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