Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..875m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 875-884
Astronomy and Astrophysics
Astrophysics
21
Cepheid Variables, Line Spectra, Silicon Isotopes, Spectroscopic Analysis, Stellar Oscillations, Frequency Distribution, Radial Velocity, Spectrum Analysis, Temporal Resolution
Scientific paper
High spectral and time resolution observations have been carried out on the beta Cephei star 12 Lacertae. More than 750 spectra of high quality (signal-to-noise ratio above 200) were obtained on the Si III lambda lambda 4553-4575 triplet lines. A frequency analysis performed on the radial velocity curves reveals the presence of 6 frequencies (of which 3 form an equidistant triplet), already detected in photometric data. A sine-fit of our data using all these frequencies show that over 40 years, periods and amplitudes did not change noticeably. The moment method is then used in an attempt to derive the pulsation parameters. Unfortunately, it turns out that the method as proposed by Mathias et al. (1994) is not accurate enough in case of a complicated pulsation structure, such as the one of 12 Lacertae. Because of this we cannot deny, neither confirm previous mode identifications in this stars. We mention, however, that a frequency analysis performed on the line parameters variations (residual intensity and full width at half maximum) are in favor of non-radial modes with a main sectoral one or a tesseral one with l - 1 = absolute value of m. It seems that shock waves are not present in the pulsation.
Aerts Christine
Gillet Denis
Mathias Ph.
Waelkens Christoffel
No associations
LandOfFree
A spectroscopic analysis of the beta Cephei star 12 Lacertae 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 A spectroscopic analysis of the beta Cephei star 12 Lacertae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A spectroscopic analysis of the beta Cephei star 12 Lacertae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1786746