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J/PASP/106/1120 Delta Scuti variables. II. DY Her (Milone+, 1994)
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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 (SIMBAD/NED Reference)
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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)
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 R_min_=2.77+/-0.20R_{sun}_. When combined with effective
temperatures from Breger et al. (1978PASP...90..754B), we find a mean
bolometric luminosity of <L_B_>=21.70L_{sun}_ and a mean absolute
magnitude of <M_B_>=1.41. The radial excursion is 0.149R_{sun}_. We
use the same procedure to improve our results for EH Librae, deriving
R_min_ for each of 42 combinations of flux and color index, and obtain
mean values of R_min_=2.62+/-0.19R_{sun}_, <L_B_>=24.56L_{sun}_ and
<M_B_>=1.27.
Addresses:
Milone E.F. milone@acs.ucalgary.ca
Wilson W.J.F. wjfwilso@acs.ucalgary.ca
Fry D.J.I. fry@acs.ucalgary.ca
Rothney Astrophysical Observatory, Department of Physics and Astronomy,
University of Calgary, 2500 University Drive, NW, Calgary AB T2N 1N4,
Canada
Schiller S.J. SchilleS@mg.sdstate.edu
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
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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 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
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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
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(End) Lee Brotzman [ADS] 16-Nov-1994, Patricia Bauer [CDS] 16-Feb-1995