J/A+A/480/187 Differential Stromgren photometry of 15 And (Dorokhova+, 2008)
The pulsating lambda Bootis star 15 Andromedae: results from a three-site
photometry campaign.
Dorokhova T. N., Handler G., Dorokhov N. I., Rodriguez E., Udovichenko S. N.
<Astron. Astrophys. 480, 187 (2008)>
=2008A&A...480..187D 2008A&A...480..187D
ADC_Keywords: Stars, Ap; Photometry, uvby ; Photometry, UBV
Keywords: stars: chemically peculiar - stars: individual: HD 221756, HD 220575 -
stars: oscillations - stars: variables: delta Scuti
Abstract:
The λ Bootis stars are a chemically peculiar subgroup of main
sequence A/F stars. Several of these fall into the instability strip
of the δ Scuti stars and the whole spectroscopic group shows a
high incidence of pulsational variability.
We investigated the pulsational behaviour of the λ Bootis star
15 And (HD 221756) to determine as many intrinsic mode frequencies as
possible for asteroseismic applications.
Description:
The data are HJD (Heliocentric Julian Day) versus magnitude
differences of 15 And relative to the comparison star HD 220575.
Table 2 contains 338 magnitude differences in Johnson V.
Telescope: 0.8m Ritchey-Chretien of Astronomical Observatory, Odessa
National University at the Mt. Dushak-Erekdag Observatory,
Turkmenistan
Observers: Dorokhov N. I., Dorokhova T. N.
Table 3 contains the magnitude differences (Du, Dv, Db, Dy, D(b-y),
Dm1, Dc1) of 257 simultaneous measurements collected in each of the
four uvby passbands of the Stromgren photometric system.
Telescope: 0.9m of the Sierra Nevada Observatory, Spain
Observer: Rodriguez E.
Tables 4 contains 998 magnitude differences in Stromgren y.
Telescope: 0.75m Austrian Automatic Photoelectric Telescope at
Fairborn Observatory, Arizona.
Observer: Handler G.
The observations were carried out in 2003-04 during the multi-site
campaign. The origin in time is the Julian Day 2452853.
Objects:
---------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------
23 34 37.5 +40 14 11 15 And = HD 221756
23 24 34.9 +41 06 46 HD 220575 = HR 8902
---------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 29 338 V differential photometry
table3.dat 75 257 uvby differential photometry
table4.dat 29 998 y differential photometry
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq Full data point number
7- 20 F14.6 d HJD Heliocentric Julian date
24- 29 F6.3 mag DVmag Differential Johnson V magnitude
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- Seq Full data point number
7- 20 F14.6 d HJD Heliocentric Julian date
22- 27 F6.3 mag Dumag Differential u magnitude
29- 35 F7.4 mag Dvmag Differential v magnitude
37- 43 F7.4 mag Dbmag Differential b magnitude
45- 51 F7.4 mag Dymag Differential y magnitude
53- 59 F7.4 mag Db-y Differential b-y colour index
61- 67 F7.4 mag Dm1 Differential metallicity index
69- 75 F7.4 mag Dc1 Differential luminosity index
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 4 I3 --- Seq Full data point number
7- 20 F14.6 d HJD Heliocentric Julian date
24- 29 F6.3 mag Dymag Differential Stromgren y magnitude
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Acknowledgements:
Gerald Handler, handler(at)astro.univie.ac.at
(End) Patricia Vannier [CDS] 08-Jan-2008