LO Pegasi: An investigation of multi-band optical polarization

Abstract

We present BVR polarimetric study of the cool active star LO Peg for the first time. LO Peg was found to be highly polarized among the cool active stars. Our observations yield average values of polarization in LO Peg: $P_B=0.387\pm 0.004$, ${\theta }_B=88°\pm 1°$; $P_V=0.351\pm 0.004$, ${\theta }_V=91°\pm 1°$; and $P_R=0.335\pm 0.003$, ${\theta }_R=91°\pm 1°$. Both the degree of polarization and the position angle are found to be variable. The semi-amplitude of the polarization variability in B, V and R bands are found to be $0.18\pm 0.02$%, $0.13\pm 0.01$% and $0.10\pm 0.02$%, respectively. We suggest that the levels of polarization observed in LO Peg could be the result of scattering of an anisotropic stellar radiation field by an optically thin circumstellar envelope or scattering of the stellar radiation by prominence-like structures.

9 pages, 6 figures and 5 tables, Accepted for publication in MNRAS

References in corpus (2)

• Optical polarimetric study of open clusters: Distribution of Interstellar matter towards NGC 654
• Broad Band Optical Polarimetric Study of IC 1805

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• Optical Linear Polarization toward the Open Star Cluster Casado Alessi 1
• Broadband Linear Polarization in the Region of the Open Star Cluster NGC 1817
• SN 2016B a.k.a ASASSN-16ab: a transitional type II supernova