J/PASP/106/1120 Delta Scuti variables. II. DY Her (Milone+, 1994)
Studies of large amplitude delta Scuti variables II: DY Herculis
Milone E.F., Wilson W.J.F., Fry D.J.I., Schiller S.J.
<Publ. Astron. Soc. Pac. 106, 1120 (1994)>
=1994PASP..106.1120M 1994PASP..106.1120M (SIMBAD/NED Reference)
ADC_Keywords: Stars, variable ; Photometry, UBVRIJKLMNH
Abstract:
This is the second paper in a series on large-amplitude delta Scuti
stars intended to determine Baade-Wesselink radii and luminosities
with precision. The first paper (Wilson et al., 1993PASP..105..809W 1993PASP..105..809W)
discussed our method of analysis and its application to EH Librae; in
this we discuss the observations and analysis of DY Herculis. Optical
and infrared photometry and cross-correlated radial-velocity data have
been obtained and analyzed. Fourier representations for the UBVRIJHK
light curves and for the radial-velocity curves were used to derive a
value for the minimum radius for each of 60 combinations of flux and
color index. From these we adopt a mean value for the minimum radius
of Rmin=2.77±0.20R☉. When combined with effective
temperatures from Breger et al. (1978PASP...90..754B 1978PASP...90..754B), we find a mean
bolometric luminosity of <LB≥21.70L☉ and a mean absolute
magnitude of <MB≥1.41. The radial excursion is 0.149R☉. We
use the same procedure to improve our results for EH Librae, deriving
Rmin for each of 42 combinations of flux and color index, and obtain
mean values of Rmin=2.62±0.19R☉, <LB≥24.56L☉ and
<MB≥1.27.
Addresses:
Milone E.F.
Wilson W.J.F.
Fry D.J.I.
Rothney Astrophysical Observatory, Department of Physics and Astronomy,
University of Calgary, 2500 University Drive, NW, Calgary AB T2N 1N4,
Canada
Schiller S.J.
Physics Department, South Dakota State University,
Box 2219, Brookings, South Dakota 57007-0395
Objects:
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RA (2000) DE Designation(s)
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16 31 17 +12 00.4 DY Her
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 44 394 Optical photometry of DY Her (RAO Data)
table2 61 140 Optical photometry of DY Her (McDonald Data)
table3 50 51 Infrared observations of DY Her
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
15- 20 F6.4 --- Phase [0/1[ Phase
23- 28 F6.4 mag DVmag []? Differential V magnitude
29 A1 --- n_DVmag [*] "*" denotes rejected data point (1)
31- 36 F6.4 mag DBmag []? Differential B magnitude
37 A1 --- n_DBmag [*] "*" denotes rejected data point (1)
39- 44 F6.4 mag DImag []? Differential I magnitude
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Note (1): An asterisk, '*', denotes a rejected data point, one not used in
the computation of the light curve or the derivation of the
Wesselink radius.
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Byte-by-byte Description of file: table2
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date
15- 20 F6.4 --- Phase [0/1[ Phase
23- 28 F6.4 mag DUmag Differential U magnitude
29 A1 --- n_DUmag [*] "*" denotes rejected data point (1)
31- 36 F6.4 mag DBmag Differential B magnitude
37 A1 --- n_DBmag [*] "*" denotes rejected data point (1)
39- 44 F6.4 mag DVmag Differential V magnitude
45 A1 --- n_DVmag [*] "*" denotes rejected data point (1)
47- 52 F6.4 mag DRmag Differential R magnitude
53 A1 --- n_DRmag [*] "*" denotes rejected data point (1)
55- 60 F6.4 mag DImag Differential I magnitude
61 A1 --- n_DImag [*] "*" denotes rejected data point (1)
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Note (1): An asterisk, '*', denotes a rejected data point, one not used in
the computation of the light curve or the derivation of the
Wesselink radius.
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d HJD Heliocentric Julian Date
16- 22 F7.5 --- Phase [0/1[ Phase
25- 31 F7.5 mag DJmag []? Differential J magnitude
32 A1 --- n_DJmag [*] "*" denotes rejected data point (1)
34- 40 F7.5 mag DHmag []? Differential H magnitude
41 A1 --- n_DHmag [*] "*" denotes rejected data point (1)
43- 49 F7.5 mag DKmag []? Differential K magnitude
50 A1 --- n_DKmag [*] "*" denotes rejected data point (1)
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Note (1): An asterisk, '*', denotes a rejected data point, one not used in
the computation of the light curve or the derivation of the
Wesselink radius.
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Origin: AAS CD-ROM series, Volume 3, 1995
(End) Lee Brotzman [ADS] 16-Nov-1994, Patricia Bauer [CDS] 16-Feb-1995