J/A+A/407/1059 Stroemgren photometry of V2109 Cyg (Rodriguez+, 2003)
Delta Sct-type nature of the variable V2109 Cyg.
Rodriguez E., Arellano Ferro A., Costa V., Lopez-Gonzalez M.J.,
Sareyan J.P.
<Astron. Astrophys. 407, 1059 (2003)>
=2003A&A...407.1059R 2003A&A...407.1059R
ADC_Keywords: Stars, variable ; Photometry, uvby, beta
Keywords: stars: variables: delta Sct - stars: individual: V2109 Cyg -
stars: oscillations - techniques: photometric, spectroscopic
Abstract:
We present the results of simultaneous uvbyβ photometry carried
out from 1999 to 2001 of the variable V2109 Cyg together with a
spectroscopic analysis based on one high resolution spectrum obtained
in 2000. From this study, the star is definitively classified as an
evolved δ Sct-type variable with solar metal abundances. This
conclusion is also supported by the detected multiperiodic pulsational
behaviour and the observed variation of the m1 index over the
pulsation cycle.
Description:
The photometric observations were collected through the years 1999 to
2001 at Sierra Nevada Observatory (SNO), Spain (ubvyβ
measurements using the 0.9m telescope) and in 2000 at San Pedro Martir
Observatory (SPMO), Mexico (uvby photometry using the 1.5m telescope).
Objects:
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RA (2000) DE Designation(s)
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20 08 50.42 +48 54 39.4 V2109 Cyg = HD 191635 = HIP 99252
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 35 15 Results of the O-C analysis.
table5.dat 50 24 Results from the Fourier analysis applied to the
data collected by Kiss et al.
(1999A&A...345..149K 1999A&A...345..149K) and the Hipparcos
satellite (ESA, 1997, Cat. I/239).
table7.dat 40 20 Photometry (as normal points over the
pulsational cycle) of the variable V2109 Cyg
tables.tex 79 144 LaTeX version of the tables
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See also:
J/A+AS/144/469 : Delta Scuti stars (Rodriguez+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- i Number of the corresponding time of maximum
4- 15 F12.4 d HJD Heliocentric Julian date of time of maximum
18- 22 I5 --- Ei Cycle number
25- 31 F7.4 d O-C Observed minus computed (O-C)
35 I1 --- r_HJD [1/2] Sources for the times of maxima (1)
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Note (1): 1) Kiss et al. (1999A&A...345..149K 1999A&A...345..149K), 2) present work.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Param Parameter name
15- 16 A2 --- Band [vbyBV Hp] Band (1)
19- 25 F7.2 mmag A Fourier A coefficient (amplitude)
29- 32 F4.2 mmag e_A ? rms uncertainty on A
36- 40 F5.3 rad Phi ? Fourier phi coefficient (phase)
42- 46 F5.3 rad e_Phi ? rms uncertainty on Phi
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Note (1): The corresponding Tor are:
2451032.3149 days for the 1998 vby data,
2451087.2514 days for the 1998 BV data and
2447862.0393 days for the Hipparcos Hp data
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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2- 5 F4.2 --- Phase [0/1[ Phase
8- 12 F5.3 mag Vmag Visual magnitude
15- 19 F5.3 mag b-y b-y colour index
22- 26 F5.3 mag m1 m1 colour index
29- 33 F5.3 mag c1 c1 colour index
36- 40 F5.3 mag beta beta colour index
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Acknowledgements: Eloy Rodriguez
(End) Patricia Bauer [CDS] 26-Jun-2003