Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae

Details Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406.1019n&link_type=abstract

Astronomy and Astrophysics, v.406, p.1019-1031 (2003)

Astronomy and Astrophysics

Astrophysics

74

Stars: Magnetic Fields, Stars: Oscillations, Stars: Winds, Outflows

Scientific paper

zeta Cas is a B2 IV star with vsin i = 17 km s-1. Time-resolved circular spectropolarimetric observations of zeta Cas obtained in 2001 and 2002 with the Musicos échelle spectropolarimeter at the 2 m Télescope Bernard Lyot (TBL) show a sinusoidally varying longitudinal magnetic field with a strength between 10 G and -46 G for the averaged line-of-sight component, corresponding to B_pol=335+120-65 G. The period corresponds very accurately with the 5.37045 day period as derived from stellar wind variations observed in the ultraviolet. The epoch of the positive maximum field corresponds in phase with the maximum emission in the UV wind lines. This gives compelling evidence for a magnetic rotator model for this star, with an unambiguous rotation period of 5.37 days. We searched for periodicity in line-profile variations (lpv), radial velocity and minimum intensity curves in the ~ 400 optical spectra. We found a non-radial pulsation mode with l=2 +/- 1 at the frequency f=0.64 c d-1. From this periodicity and from stellar parameters derived from model fits, we propose to classify zeta Cas as a Slowly Pulsating B (SPB) star. This is the third detection of a magnetic field in an early B-type pulsating star and the first one in a SPB star.
Based on observations obtained using the Musicos spectropolarimeter at the Observatoire du Pic du Midi, France, and on INES data from the International Ultraviolet Explorer (IUE) satellite.

Affiliated with

Also associated with

No associations

Rating

Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae 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 Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of a magnetic field in the Slowly Pulsating B star zeta Cassiopeiae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1662773