Other
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..188m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 1, pp. 188-192.
Other
2
Stars: Chemically Peculiar, Stars: Individual: Hd 119027, Stars: Oscillations, Stars: Variables: Other
Scientific paper
We present new high-speed, multisite photometric observations of the rapidly oscillating Ap star HD 119027 acquired over seven nights during 1996. A frequency analysis of these observations reveals the presence of oscillations at 1835, 1875, 1888, 1913, 1940, 1942 and (possibly) 1953 muHz. These frequencies are consistent with a spacing of either 13 or 26 muHz, depending on the reality of the oscillations at 1875 and 1953 muHz. The data in hand do not permit us to discriminate between the two possible spacings. If the smaller value of the spacing is correct, it suggests that HD 119027 is outside the main-sequence band. Two of the frequencies listed above are separated by only 1.95 muHz, suggesting that they are modes of (n,l) and (n-1,l+2), which in roAp stars is a quantity governed by the internal magnetic field.
Koen Chris
Martinez Peter
Sullivan David J.
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