Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-03-14
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
9 pages, 6 figures and 5 tables, Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2009.14762.x
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: $P_B =0.387\pm 0.004%$, $\theta_B = 88\deg\pm1\deg$; $P_V=0.351\pm0.004%$, $\theta_V=91\deg\pm1\deg$; and $P_R= 0.335\pm0.003%$, $\theta_R = 91\deg\pm1\deg$. 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 $0.18\pm0.02$%, $0.13\pm0.01$% and $0.10\pm0.02$%, 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.
Medhi Biman J.
Pandey Ajay K.
Pandey Jeewan C.
Sagar Ram
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