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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
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:
FileName Lrecl Records Explanations
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
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
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 ? 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
Byte-by-byte Description of file: table2a.dat
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 --- --- [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
Byte-by-byte Description of file: table2b.dat
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 [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
Byte-by-byte Description of file: table3a.dat
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
Byte-by-byte Description of file: table3b.dat
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 [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
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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