Abstract:
We present the results based on broad-band (VRI)
polarimetric observations of a number of stars that are
present towards the fields of already known bright po-
larised standard stars namely BD+59° 389, HD 19820, and
HD 25443. These three relatively bright stars were observed
continuously for various observing programs using ARIES
Imaging Polarimeter (AIMPOL) attached with 1-m Sampur-
nanand Telescope (ST) since 2006 to correct for any polar-
isation position angle offset. Since AIMPOL is an imaging
polarimeter with a field-of-view of ∼8 arcmin diameter, we
could get polarisation measurements of a number of rela-
tively faint stars that are present within the field-of-view of
the AIMPOL towards the above three bright polarised stan-
dards. Based on these compiled observations for a relatively
long duration, we could examine the constancy of the degree
of polarisation and position angles of them. With the help of
some statistical tests, five stars in the field of BD+59° 389
and two stars in the field of HD 19820 have been identified
as stars that could be used as additional polarised standard
stars. Since these additional stars are relatively fainter than
the known polarised standards, they could be observed with
bigger aperture telescopes (like 2-m) without them getting
saturated.
