J/AJ/133/1421 BV differential photometry of 11 gamma Dor stars (Henry+, 2007)
Photometry and spectroscopy of 11 γ Doradus stars.
Henry G.W., Fekel F.C., Henry S.M.
<Astron. J., 133, 1421-1440 (2007)>
=2007AJ....133.1421H 2007AJ....133.1421H
ADC_Keywords: Stars, variable ; Photometry, UBV
Keywords: stars: early-type - stars: fundamental parameters -
stars: oscillations - stars: variables: other
Abstract:
We have used precise photometric and high-dispersion spectroscopic
observations to study 11 gamma Doradus stars, 10 of them newly
confirmed. Only five of these 11 gamma Doradus stars appear to be
single; two are primaries of double-lined spectroscopic binaries, one
is the secondary of a double-lined binary, two are primaries of visual
binaries and, in the case of the double-lined binary (HD 86371),
either or both components could be a pulsating gamma Doradus star. We
have determined a preliminary orbital period of 5.32 days for the
double-lined binary HD 41547. Several of the stars show spectroscopic
line-profile and low-amplitude radial velocity variability indicative
of pulsation. All 11 stars are photometrically variable with
amplitudes between 4 and 94 mmag in Johnson B and periods between 0.38
and 1.86 days. The 11 stars have between two and five independent
periods.
Description:
For two of the 11 stars in this sample, Fekel et al.
(2003AJ....125.2196F 2003AJ....125.2196F) previously obtained spectroscopic observations
at the Kitt Peak National Observatory (KPNO) with the coude feed
telescope, coude spectrograph, and a TI CCD detector. Using the same
telescope, spectrograph, and detector combination, we acquired spectra
of all 11 stars between 2002 September and 2006 September. Combining
the data, we have at least two spectra of each star.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 53 10 Program, Comparison, and Check Stars
table4.dat 60 3680 Photometric Observations
table6.dat 95 68 Derived Properties of gamma Doradus stars
refs.dat 64 24 References
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See also:
J/A+A/450/715 : Differential uvby photometry of HD 218427 (Rodriguez+, 2006)
J/A+A/456/261 : Differential uvby photometry of HD 239276 (Rodriguez+, 2006)
J/A+A/472/241 : UV Flux distributions of gamma Dor stars (Gerbaldi+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number of the star
11- 19 A9 --- Comp Comparison star
21- 29 A9 --- Check Check star
30 A1 --- n_Check [bc] Note on Check star (1)
32- 37 F6.4 mag sigB(V-C) Variable - Comparison mean difference
in Johnson B band
40- 45 F6.4 mag sigB(Ch-C) Check - Comparison mean difference
in Johnson B band
47- 53 F7.5 d Per Period (from table6)
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Note (1): Notes as follows:
b = The check star HD 41547 is also a new gamma Doradus variable and
is analyzed in this paper
c = The check star HD 103484 is a new K-type variable
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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- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number of the star
10 A1 --- --- [&]
11- 19 A9 --- Check Check star name for HD 41547 (1)
21- 32 F12.4 d HJD Heliocentric Julian Date of Observation
34- 39 F6.3 mag DBmag ?=99.999 Variable - Comparison differential
Johnson B magnitude (2)
41- 46 F6.3 mag DVmag ?=99.999 Variable - Comparison differential
Johnson V magnitude (2)
48- 53 F6.3 mag B(Ch-C) ?=99.999 Check - Comparison differential
Johnson B magnitude (2)
55- 60 F6.3 mag V(Ch-C) ?=99.999 Check - Comparison differential
Johnson V magnitude (2)
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Note (1): The check star HD 41547 is also a new gamma Doradus variable and
is analyzed in this paper
Note (2): The '99.999' signifies that the differential magnitude was
discarded because its internal standard deviation exceeded 0.01mag.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
7 A1 --- m_HD [AB] Multiplicity index
8 A1 --- u_HD Uncertainty flag on component (1)
9- 10 A2 --- n_HD [/9 ] composite HD number (for 195068/9)
12- 46 A35 --- ONames Other names
48- 54 A7 --- Dupl Duplicity (2)
56- 60 F5.2 mag Vmag V magnitude
62- 66 F5.3 mag B-V B-V colour index
68- 71 F4.2 mag VMAG Absolute V magnitude
73- 76 F4.1 solLum Lum Luminosity
78- 80 F3.1 solRad Rad Star radius
82- 88 F7.5 d Per Period
89 A1 --- n_Per [c] More than one period (3)
91- 95 A5 --- Refs References, detailed in refs.dat file
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Note (1): Colon indicates component A and/or B could be the gamma Doradus star.
Note (2): Duplicity code as follows:
VB = visual binary or double star
SB1 = spectroscopic binary of type 1
SB2 = spectroscopic binary of type 2
Single = Single star
Note (3): 'c' indicates that the star has also a period of 10.959 days
with a slightly larger amplitude
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 42 A19 --- Aut Author's name
45- 64 A20 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2009