Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..468k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 468-472. Research supported by C
Other
30
A Stars, Astronomical Photometry, Harmonic Analysis, Magnetic Stars, Peculiar Stars, Stellar Oscillations, Amplitude Distribution Analysis, Light Curve
Scientific paper
Fifty hours of new high-speed photometric observations of the rapidly oscillating Ap star HD 137949 obtained mostly in 1987 with the 1.0- and 1.9-m telescopes of the SAAO are presented. These new observations have less noise than the previous observations made in 1981 with a 0.5-m telescope. The principal frequency in HD 137949 in the 1987 data is ν1 = 2014.781±0.001 μHz; in the 1981 data it is ν1 = 2014.821±0.003 μHz. This indicates that dln ν/dt=(-9.9±0.7) × 10-14 s-1 [dP/dt=(+4.9±0.3) × 10-11 s s-1], which is about two orders of magnitude larger than expected theoretically from evolution. There is however, possibly a second frequency at, or near, ν2 = 1975 μHz, the reality of which needs confirmation. This secondary frequency, and possibly other unresolved secondary frequencies, could perturb the measurement of ν1 and hence distort the measurement of dln v/dt so that it is unreliable. If ν2 is real, the separation ν1-ν2 ≍ 40 μHz gives an estimate of the luminosity of HD 137949. The first harmonic of ν1 at 2ν1 = 4029.559±0.009 μHz is clearly present in the data. This brings to five the number of rapidly oscillating Ap stars which have non-linear light variations.
No associations
LandOfFree
A frequency analysis of new observations of the rapidly oscillating AP star HD 137949 (33 Lib) - an apparent change of frequency and detection of the first harmonic 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 frequency analysis of new observations of the rapidly oscillating AP star HD 137949 (33 Lib) - an apparent change of frequency and detection of the first harmonic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A frequency analysis of new observations of the rapidly oscillating AP star HD 137949 (33 Lib) - an apparent change of frequency and detection of the first harmonic will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1793394