Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics

Details Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...427..593u&link_type=abstract

Astronomy and Astrophysics, v.427, p.593-605 (2004)

Astronomy and Astrophysics

Astrophysics

10

Stars: Binaries: Spectroscopic, Stars: Oscillations, Line: Profiles, Stars: Individual: Λ Scorpii

Scientific paper

We present the results of our analysis of a time series of high-resolution spectra of the multiple β Cephei star λ Scorpii. The data set has a total time-span of more than 5000 days and includes an intensive monitoring campaign during 8 consecutive nights. We confirm the presence of a dominant frequency f1 = 4.679410 c d-1 in the data. We show that the amplitude is variable in time according to the light-time effect in the multiple system. The dominant frequency is identified as a prograde dipole pulsation mode. From modelling of the amplitudes and phases across the profiles we derive pulsational parameters, the inclination angle 70° ≤ i ≤ 90° and v sin i ˜ 125 km s-1. From a comparison between theoretically calculated forcing eigenfrequencies induced by the close companion and the eigenfrequencies of the observed oscillation mode we find no tidal enhancement or excitation of the pulsation mode of λ Scorpii. We find indications for the presence of additional frequencies with low amplitudes.
Based on observations obtained with the Coudé Echelle Spectrograph on the ESO CAT telescope and with the CORALIE Echelle Spectrograph on the 1.2-m Euler Swiss telescope, both situated at La Silla, Chile.

Affiliated with

Also associated with

No associations

Rating

Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics 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 Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interpretation of the variability of the β Cephei star λ Scorpii. II. The line-profile diagnostics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1008311