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J/A+A/286/136 Radial velocities of four beta Cep variables (Aerts+ 1994)
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Mode identification with the moment method in four multiperiodic beta Cephei
stars: KK Velorum, nu Eri, Beta CMa, and V348 Normae
Aerts C., Waelkens C., De Pauw M.
<Astron. Astrophys. 286, 136 (1994)>
=1994A&A...286..136A
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ADC_Keywords: Stars, variable; Radial velocities
Keywords: line: profiles - stars: early-type - stars: oscillations -
stars: individual: KK Vel, nu Eri, beta CMA, V348 Nor
Abstract:
We present analyses of line profile variations obtained for four
multiperiodic {beta} Cephei stars: KK Velorum, {nu} Eri, {beta} CMa,
and V348 Normae. An identification of the modes has been attempted by
means of the moment method. This quantitative identification technique
was first proposed by Balona (1986) and was later refined by Aerts et al.
(1992) in case of a monoperiodic pulsation in a slowly rotating star.
Recently, Mathias et al. (1993) have proposed a generalisation of the
moment method to multiperiodic pulsations. We apply their formalism to
obtain the velocity parameters in the four mentioned stars. We have found
that KK Velorum, instead of being a monoperiodic variable, pulsates in two
modes of which the second one has a period that is half of the period of
the already known mode. The Q-values for the two modes indicate that the
main mode probably is a g-mode, while the second one definitely is a
p-mode. Because we did not fully cover the overall beat-period in {nu} Eri
and {beta} CMa, we could treat only the most important modes present in the
se stars. We found it very useful for these cases to be able to combine
photometric and spectroscopic results. The rapidly rotating star V348
Normae seems to pulsate in three high-degree modes with very large
amplitudes, a confirmation of the result obtained from a photometric
analysis presented by Waelkens & Cuypers (1985).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table12 78 75 HJD and radial velocities for the measured
spectra of the four stars (table12 + table13
in the paper)
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Byte-by-byte Description of file: table12
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD1 []? Heliocentric Julian Date for KK Vel (1)
15- 18 F4.1 km/s <v>1 []? Radial velocity for KK Vel
21- 32 F12.4 d HJD2 []? Heliocentric Julian Date for nu Eri (1)
34- 38 F5.1 km/s <v>2 []? Radial velocity for nu Eri
41- 52 F12.4 d HJD3 []? Heliocentric Julian Date for beta CMa (1)
55- 58 F4.1 km/s <v>3 []? Radial velocity for beta CMa
61- 72 F12.4 d HJD4 Heliocentric Julian Date for V348 Nor (1)
74- 78 F5.1 km/s <v>4 Radial velocity FOR V348 Nor
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Note (1): Stars Observed are:
KK Vel = HD 78616 pos2000 = 09 07 42.5 -44 37 57
nu Eri = HD 29248 pos2000 = 04 36 19.1 -03 21 09
bet CMa = HD 44743 pos2000 = 06 22 41.9 -17 57 21
V348 Nor = HD 147985 pos2000 = 16 26 56.6 -43 47 57
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(End) Patricia Bauer [CDS] 31-Jan-1994