Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303

Details Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303 Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303

2006-10-05

arxiv.org/abs/astro-ph/0610148v1

Astronomy and Astrophysics

Astrophysics

17pages, 7figures; accepted for Publications of the Astronomical Society of Japan

Scientific paper

We present optical linear spectropolarimetry of the microquasar LS I +61$^{\circ}$ 303. The continuum emission is mildly polarized (up to 1.3 %) and shows almost no temporal change. We find a distinct change of polarization across the H$\alpha$ emission line, indicating the existence of polarization component intrinsic to the microquasar. We estimate the interstellar polarization (ISP) component from polarization of the H$\alpha$ line and derive the intrinsic polarization component. The wavelength dependence of the intrinsic component is well explained by Thomson scattering in equatorial disk of the Be-type mass donor. The position angle (PA) of the intrinsic polarization $\sim 25^{\circ}$ represents the rotational axis of the Be disk. This PA is nearly perpendicular to the PA of the radio jet found during quiescent phases. Assuming an orthogonal disk-jet geometry around the compact star, the rotational axis of the accretion disk is almost perpendicular to that of the Be disk. Moreover, according to the orbital parameters of the microquasar, the compact star is likely to get across the Be disk around their periastron passage. We discuss the peculiar circumstellar structure of this microquasar inferred from our observation and possible connection with its high-energy activities.

Affiliated with

Also associated with

No associations

Rating

Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectropolarimetric Study on Circumstellar Structure of Microquasar LS I +61deg 303 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-655624