J/A+A/463/243 Variations of O-B stars in Mercator observations (De Cat+, 2007)
Long term photometric monitoring with the Mercator telescope:
Frequencies and mode identification of variable O-B stars.
De Cat P., Briquet M., Aerts C., Goossens K., Saesen S., Cuypers J.,
Yakut K., Scuflaire R., Dupret M.-A., Uytterhoeven K., Van Winckel H.,
Raskin G., Davignon G., Le Guillou L., Van Malderen R., Reyniers M.,
Acke B., De Meester W., Vanautgaerden J., Vandenbussche B., Verhoelst T.,
Waelkens C., Deroo P., Reyniers K., Ausseloos M., Broeders E.,
Daszynska-Daskiewicz J., Debosscher J., De Ruyter S., Lefever K., Decin G.,
Kolenberg K., Mazumdar A., Van Kerckhoven C., De Ridder J., Drummond R.,
Barban C., Vanhollebeke E., Maas T., Decin L.
<Astron. Astrophys. 463, 243 (2007)>
=2007A&A...463..243D 2007A&A...463..243D
ADC_Keywords: Stars, variable ; Stars, early-type ; Photometry, Geneva
Keywords: stars: early-type - stars: variables: general - stars: oscillations
Description:
We selected a large sample of O-B stars that were considered as
(candidate) slowly pulsating B, beta Cep, and Maia stars after the
analysis of their Hipparcos data. We analysed both the Hipparcos data
and our new seven passband Geneva data collected for these stars
during the first three years of scientific operations of the Mercator
telescope. We performed a frequency analysis for 28 targets with more
than 50 high-quality Mercator observations to improve their
variability classification. We searched for frequencies by using two
independent frequency analysis methods and we applied a 3.6 S/N-level
criterion to locate the significant peaks in the periodograms. In
total we detected 60 frequencies, among which 32 new ones. We
classified 21 objects as pulsating variables (7 new confirmed
pulsating stars, including 2 hybrid beta Cep/SPB stars), 6 as
non-pulsating variables (binaries or spotted stars), and 1 as
photometrically constant stars. For the 27 confirmed variable stars in
our sample, we give the values and the corresponding standard errors
of the accepted frequencies, the amplitudes, the phases, the constant
terms, and the residual standard deviations as found in the seven
filters of the Geneva photometric system and in the Hp filter of the
Hipparcos photometric system by fitting the data with a superposition
of sinusoidal models with reference epoch HJD=2450000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 61 27 List of variables with positions from Simbad
table2a.dat 303 27 Mean magnitudes in the 7 Geneva passbands
table2b.dat 313 73 Variations in the seven Geneva passbands
table3a.dat 93 21 Mean magnitudes in the Hipparcos Hp passband
table3b.dat 103 33 Variations in the Hipparcos Hp passband
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
3- 8 I6 --- HD HD number of the star
10- 12 A3 --- --- [HIP]
13- 18 I6 --- HIP ? Hipparcos number (Cat. I/239)
20- 21 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
23- 24 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
26- 29 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
31 A1 --- DE- Simbad Sign of the Declination (J2000.0)
32- 33 I2 deg DEd Simbad Degree of Declination (J2000.0)
35- 36 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
38- 39 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
43- 47 F5.3 mag Bmag Simbad B band magnitude
49- 53 F5.3 mag Vmag Simbad V band magnitude
55- 61 A7 --- SpType Simbad MK spectral
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Byte-by-byte Description of file: table2a.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
3- 8 I6 --- HD HD number of the star
10- 12 A3 --- --- [HIP]
13- 18 I6 --- HIP ? HIP number of the star
22 I1 --- --- [0] Order of frequency (G1)
72- 78 F7.4 mag Umag Mean magnitude in Geneva U filter
81- 86 F6.4 mag e_Umag Standard error on Umag
90- 93 F4.1 mmag Ures Standard deviation of final residuals in U
107-113 F7.4 mag Bmag Mean magnitude in Geneva B filter
116-121 F6.4 mag e_Bmag Standard error on Bmag
125-128 F4.1 mmag Bres Standard deviation of final residuals in B
142-148 F7.4 mag B1mag Mean magnitude in Geneva B1 filter
151-156 F6.4 mag e_B1mag Standard error on B1mag
160-163 F4.1 mmag B1res Standard deviation of final residuals in B1
177-183 F7.4 mag B2mag Mean magnitude in Geneva B2 filter
186-191 F6.4 mag e_B2mag Standard error on B2mag
195-198 F4.1 mmag B2res Standard deviation of final residuals in B2
212-218 F7.4 mag V1mag Mean magnitude in Geneva V1 filter
221-226 F6.4 mag e_V1mag Standard error on V1mag
230-233 F4.1 mmag V1res Standard deviation of final residuals in V1
247-253 F7.4 mag Vmag Mean magnitude in Geneva V filter
256-261 F6.4 mag e_Vmag Standard error on Vmag
265-268 F4.1 mmag Vres Standard deviation of final residuals in V
282-288 F7.4 mag Gmag Mean magnitude in Geneva G filter
291-296 F6.4 mag e_Gmag Standard error on Gmag
300-303 F4.1 mmag Gres Standard deviation of final residuals in G
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Byte-by-byte Description of file: table2b.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
3- 8 I6 --- HD HD number of the star
10- 12 A3 --- --- [HIP]
13- 18 I6 --- HIP ? HIP number of the star
22 I1 --- Order [1/5] Order of frequency (G1)
25- 32 F8.5 d-1 Freq ? Frequency observed in Geneva data
36- 43 F8.5 d-1 e_Freq ? Standard error on Freq
48- 55 F8.4 uHz FrequHz ? Frequency expressed in µHz
59- 66 F8.4 uHz e_FrequHz ? Standard error on FrequHz
71- 75 F5.1 mmag Uamp Amplitude of variations with Freq in U filter
80- 83 F4.1 mmag e_Uamp Standard error on Uamp
91- 95 F5.3 --- Uphi [0,1[ Phase of variations with Freq in U
99-103 F5.3 --- e_Uphi ? Standard error on Uphi
106-110 F5.1 mmag Bamp Amplitude of variations with Freq in B filter
115-118 F4.1 mmag e_Bamp Standard error on Bamp
126-130 F5.3 --- Bphi [0,1[ Phase of variations with Freq in B
134-138 F5.3 --- e_Bphi ? Standard error on Bphi
141-145 F5.1 mmag B1amp Amplitude of variations with Freq in B1 filter
150-153 F4.1 mmag e_B1amp Standard error on B1amp
161-165 F5.3 --- B1phi [0,1[ Phase of variations with Freq in B1
169-173 F5.3 --- e_B1phi ? Standard error on B1phi
176-180 F5.1 mmag B2amp Amplitude of variations with Freq in B2 filter
185-188 F4.1 mmag e_B2amp Standard error on B2amp
196-200 F5.3 --- B2phi [0,1[ Phase of variations with Freq in B2
204-208 F5.3 --- e_B2phi ? Standard error on B2phi
211-215 F5.1 mmag V1amp Amplitude of variations with Freq in V1 filter
220-223 F4.1 mmag e_V1amp Standard error on V1amp
231-235 F5.3 --- V1phi [0,1[ Phase of variations with Freq in V1
239-243 F5.3 --- e_V1phi ? Standard error on V1phi
246-250 F5.1 mmag Vamp Amplitude of variations with Freq in V filter
255-258 F4.1 mmag e_Vamp Standard error on Vamp
266-270 F5.3 --- Vphi [0,1[ Phase of variations with Freq in V
274-278 F5.3 --- e_Vphi ? Standard error on Vphi
281-285 F5.1 mmag Gamp Amplitude of variations with Freq in G filter
290-293 F4.1 mmag e_Gamp Standard error on Gamp
301-305 F5.3 --- Gphi [0,1[ Phase of variations with Freq in G
309-313 F5.3 --- e_Gphi ? Standard error on Gphi
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Byte-by-byte Description of file: table3a.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
3- 8 I6 --- HD HD number of the star
10- 12 A3 --- --- [HIP]
13- 18 I6 --- HIP HIP number of the star
22 I1 --- Order [0] Order of frequency (G1)
72- 78 F7.4 mag Hpmag Hipparcos Hp mean magnitude
81- 86 F6.4 mag e_Hpmag Standard error on Hpmag
90- 93 F4.1 mmag Hpres Standard deviation of the final residuals
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Byte-by-byte Description of file: table3b.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
3- 8 I6 --- HD HD number of the star
10- 12 A3 --- --- [HIP]
13- 18 I6 --- HIP ? HIP number of the star
22 I1 --- Order [1/3] Order of frequency (G1)
25- 32 F8.5 d-1 Freq ? Frequency observed in Hipparcos data
36- 43 F8.5 d-1 e_Freq ? Standard error on Freq
48- 55 F8.4 uHz FrequHz ? Frequency expressed in µHz
59- 66 F8.4 uHz e_FrequHz ? Standard error on FrequHz
71- 75 F5.1 mmag Hpamp Amplitude of variations with Freq in Hp mag.
80- 83 F4.1 mmag e_Hpamp Standard error on Hpamp
91- 95 F5.3 --- Hpphi [0,1[ Phase of variations with Freq in Hp
99-103 F5.3 --- e_Hpphi ? Standard error on Hpphi
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Global Notes:
Note (G1): The order 0 corresponds to the mean values,
given in tables 2a (Geneva photometry) and 3a (Hipparcos)
Acknowledgements:
Peter De Cat, peter(at)oma.be
(End) P. De Cat [Royal Obs. of Belgium], Patricia Vannier [CDS] 24-Nov-2006