J/A+A/311/873 Geneva Photometry of HD 34798 & HD 45284 (Waelkens+, 1996)
The slowly pulsating B stars HD 34798 and HD 45284.
Waelkens C.
<Astron. Astrophys. 311, 873 (1996)>
=1996A&A...311..873W 1996A&A...311..873W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, B-type ; Photometry, Geneva
Keywords: stars: early-type - stars: individual: HD 34798 -
stars: individual: HD 45284 - stars: oscillations
Abstract:
We discuss the period analysis of two variable mid-B stars that have
been observed in the Geneva photometric system between 1981 and 1990.
Both HD 34798 and HD 45284 are multiperiodic g-mode pulsators that
belong to the group of slowly pulsating B stars. The power spectrum of
HD 34798 is characterized by several modes which have about equal
power. This star belongs to a visual binary, the other component of
which is a singly periodical CP star. Quasi-simultaneous observations
of both stars are discussed and turn out to be helpful to illustrate
the multiperiodic behavior of HD 34798. Three oscillation modes with a
nearly stable amplitude are found; the remaining variability may be
due to two very close oscillation modes, or, alternatively, to one
mode with an intrinsically variable amplitude. Three oscillation
frequencies can be distinguished clearly in the power spectrum of HD
45284. The beat periods for this star are the shortest for any SPB
detected so far, and therefore make HD 45284 an excellent candidate
for verification of our results and for asteroseimological follow-up.
Objects:
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RA (2000) DE Name
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05 19 17.42 -18 31 12.3 HD 34798
06 26 13.14 -07 21 41.3 HD 45284
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table 62 554 Photometric data
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See also:
GCPD/13 : definition of the Geneva 7-colour photometric system.
Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 20 F11.3 d HJD Heliocentric Julian day
22- 26 F5.3 mag Vmag V magnitude
28- 32 F5.3 mag [U-B] U-B colour
34- 38 F5.3 mag [V-B] V-B colour
40- 44 F5.3 mag [B1-B] B1-B colour
46- 50 F5.3 mag [B2-B] B2-B colour
52- 56 F5.3 mag [V1-B] V1-B colour
58- 62 F5.3 mag [G-B] G-B colour
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(End) Patricia Bauer [CDS] 1996-Feb-01