J/AJ/142/39 Sample of 114 γ Doradus candidates (Henry+, 2011)
A volume-limited photometric survey of 114 γ Doradus candidates.
Henry G.W., Fekel F.C., Henry S.M.
<Astron. J., 142, 39 (2011)>
=2011AJ....142...39H 2011AJ....142...39H
ADC_Keywords: Stars, variable ; Photometry ; Radial velocities
Keywords: stars: early-type - stars: fundamental parameters -
stars: oscillations (including pulsations)
Abstract:
We have carried out a photometric survey of a complete, volume-limited
sample of γ Doradus candidates. The sample was extracted from
the Hipparcos catalog and consists of 114 stars with colors and
absolute magnitudes within the range of known γ Doradus stars
and that also lie within a specified volume of 266600pc3. We devoted
one year of observing time with our T12 0.8m automatic photometric
telescope to acquire nightly observations of the complete sample of
stars. From these survey observations, we identify 37 stars with
intrinsic variability of 0.002mag or more. Of these 37 variables, 8
have already been confirmed as γ Doradus stars in our earlier
papers; we scheduled the remaining 29 variables on our T3 0.4m
automatic telescope to acquire more intensive observations over the
next two years. As promising new γ Doradus candidates were
identified from the photometry, we obtained complementary
spectroscopic observations of each candidate with the Kitt Peak coude
feed telescope. Analysis of our new photometric and spectroscopic data
reveals 15 new γ Doradus variables (and confirms two others), 8
new δ Scuti variables (and confirms one other), and 3 new
variables with unresolved periodicity. Therefore, of the 114 γ
Doradus candidates in our volume-limited sample, we find 25 stars that
are new or previously known γ Doradus variables. This results in
an incidence of 22% for γ Doradus variability among candidate
field stars for this volume of the solar neighborhood. The
corresponding space density of γ Doradus stars in this volume of
space is 0.094 stars per 103pc3 or 94 stars per 106pc3. We provide
an updated list of 86 bright, confirmed, γ Doradus field stars.
Description:
The initial photometric survey of the sample of 114 stars was carried
out between 2001 April and 2002 July with our T12 0.8m APT at
Fairborn Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 120 114 Volume-limited sample of 114 gamma Doradus candidates
table4.dat 45 5496 Photometric observations of new γ Doradus stars
table7.dat 64 129 Individual radial velocities of new γ Dor stars
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See also:
J/A+A/472/241 : UV Flux distributions of gamma Dor stars (Gerbaldi+, 2007)
J/AJ/133/1421 : BV differential photometry of 11 gamma Dor stars (Henry+, 2007)
J/A+A/499/967 : Long-term monitoring of γ Dor stars (Cuypers+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD identification number (Cat. III/135)
8- 13 I6 --- HIP HIP identification number (Cat. I/311)
15- 40 A26 --- OName Other Names
42- 45 F4.2 mag Vmag HIP V magnitude
47- 51 F5.3 mag B-V HIP B-V colour index
53- 57 F5.2 mas plx HIP parallax
59- 62 F4.2 mas e_plx rms uncertainty on plx
64- 67 F4.2 mag VMAG Absolute V magnitude
69 A1 --- Var HIP variability type (1)
71- 73 I3 --- Nobs ? Number of observations
75- 82 F8.2 d JD1 ? Date range (HJD-2400000)
83 A1 --- --- [-]
84- 91 F8.2 d JD2 ? Date range (HJD-2400000)
93- 98 F6.4 mag sigma ? Estimate of each star's intrinsic brightness
variability (σstar)
100-120 A21 --- Status Final status (2)
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Note (1): HIP variability type as follows:
blank = indicates that the star could not be classified as variable
or constant
C = no variability detected ("constant")
D = duplicity induced variability
M = possible micro-variable (amplitude <0.03mag)
P = periodic variable
U = unresolved variable
Note (2): c indicates T12 APT survey observations failed because of a
bright, nearby companion. HD 162898 was added to the T3 follow-up
list and found to be constant.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Star name
8- 17 F10.4 d HJD Heliocentric Julian Date (HJD-2400000)
19- 24 F6.3 mag Bmag ?=99.999 Variable - Comparison differential
magnitude in B (1)
26- 31 F6.3 mag Vmag ?=99.999 Variable - Comparison differential
magnitude in V (1)
33- 38 F6.3 mag Bmag.c ?=99.999 Check - Comparison differential
magnitude in B (1)
40- 45 F6.3 mag Vmag.c ?=99.999 Check - Comparison differential
magnitude in V (1)
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Note (1): The '99.999' signifies that the differential magnitude was discarded
because its internal standard deviation exceeded 0.01 mag.
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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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1- 6 I6 --- HD Star name
8- 16 F9.3 d HJD Heliocentric Julian Date (HJD-2400000)
18- 22 F5.1 km/s RV Radial Velocity
24- 64 A41 --- Com Comment(s)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Sep-2012