J/AJ/143/129 Photometric and Spectroscopic observations of BF Dra (Lacy+, 2012)
Absolute properties of the eclipsing binary star BF Draconis.
Lacy C.H.S., Torres G., Fekel F.C., Sabby J.A., Claret A.
<Astron. J., 143, 129 (2012)>
=2012AJ....143..129L 2012AJ....143..129L
ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry, UBV ;
Photometry, CCD
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: fundamental parameters - stars: individual (BF Dra)
Abstract:
BF Dra is now known to be an eccentric double-lined F6+F6 binary star
with relatively deep (0.7mag) partial eclipses. Previous studies of
the system are improved with 7494 differential photometric
observations from the URSA WebScope and 9700 from the NFO WebScope,
106 high-resolution spectroscopic observations from the Tennessee
State University 2m automatic spectroscopic telescope and the 1m
coude-feed spectrometer at Kitt Peak National Observatory, and 31
accurate radial velocities from the CfA. Very accurate (better than
0.6%) masses and radii are determined from analysis of the two new
light curves and four radial velocity curves. Theoretical models match
the absolute properties of the stars at an age of about 2.72Gyr and
[Fe/H]=-0.17, and tidal theory correctly confirms that the orbit
should still be eccentric. Our observations of BF Dra constrain the
convective core overshooting parameter to be larger than about
0.13Hp. We find, however, that standard tidal theory is unable to
match the observed slow rotation rates of the components' surface
layers.
Description:
The spectroscopic observations at the Harvard-Smithsonian Center for
Astrophysics (CfA) were carried out with two different spectrographs
on the 1.5m Tillinghast reflector at the F. L. Whipple Observatory on
Mount Hopkins, AZ. Eighteen spectra were gathered by Torres between
2006 April and 2009 May with a Cassegrain-mounted echelle spectrograph
("Digital Speedometer", DS) at a resolving power of R∼35000.
Thirteen additional spectra were collected between 2010 March and 2011
November with the bench-mounted fiber-fed echelle instrument TRES at a
resolving power of R∼48000.
At Fairborn Observatory from 2010 April through 2011 June, Fekel
acquired 44 double-lined spectra with the Tennessee State University
(TSU) 2m automatic spectroscopic telescope (AST), a fiber fed echelle
spectrograph. The resolution was either 0.24 or 0.4Å. In addition,
between 2010 June and 2011 April, Fekel of TSU obtained eight
additional double-lined spectra (resolution of 0.21Å) with the KPNO
coude feed telescope, coude spectrograph, and a CCD camera.
Lacy and Sabby of the University of Arkansas (UofA) obtained
additional spectra at the KPNO coude-feed spectrometer from 1989 May
to 2011 March. The resolution was 0.3Å.
One of the telescopes used to obtain the differential photometry is
the URSA WebScope inside a Technical Innovations Robo-Dome. The
observatory is located on top of Kimpel Hall on the Fayetteville
campus. BF Dra was observed by URSA from 2002 February 8 to 2011
September 26.
The other telescope we used is the NFO (New Forest Observatory, NM)
WebScope located near Silver City, New Mexico. Observations were made
from 2005 March 18 to 2011 September 26.
Objects:
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RA (2000) DE Designation(s) (Period)
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18 50 59.35 +69 52 57.5 BF Dra = BD+69 1006 (P=11.2110011)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 70 204 Radial velocities of BF Dra and residuals from
the fitted orbit
table3.dat 51 76 Times of eclipse of BF Dra and residuals from
the ephemeris curve fit
table5.dat 25 7494 URSA Webscope (Univ. Arkansas)
differential photometry of BF Dra
table6.dat 25 9744 NFO (New Forest Observatory, New Mexico)
differential photometry of BF Dra
refs.dat 92 22 References
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2013)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
III/249 : Stellar radial velocities bibliographic catalog (Malaroda+, 2006)
II/271 : TASS Mark IV patches photometric catalog, version 2 (Droege+, 2007)
J/A+A/537/A117 : Velocity curves of SW CMa and HW CMa (Torres+, 2012)
J/A+A/546/A61 : Radial velocities for XHIP catalogue (de Bruijne+, 2012)
J/AJ/142/185 : Properties of the EB stars HY Vir (Lacy+, 2011)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/other/IBVS/5918 : Minima and maxima of 452 variables (Hubscher+, 2010)
J/other/IBVS/5941 : Minima and maxima of 292 variables (Hubscher+, 2010)
J/AJ/138/1622 : Absolute properties of LV Her (Torres+, 2009)
J/other/IBVS/5830 : Minima and maxima of 292 variables (Hubscher+, 2008)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/AJ/130/2838 : Velocity and light curves of RW Lac (Lacy+, 2005)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/AJ/128/1340 : Properties of the EB star V459 Cas (Lacy+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD [4470.35/55872.62] Heliocentric Julian Date;
HJD-2400000
12- 17 F6.4 --- Phase Orbital phase
19- 25 F7.2 km/s RV1 [-102/44]? Primary radial velocity
27- 33 F7.2 km/s RV2 [-108/44]? Secondary radial velocity
35- 39 F5.2 km/s O-C1 ? Primary (O-C) residual
41- 45 F5.2 km/s O-C2 ? Secondary (O-C) residual
47- 50 A4 --- Place Place/Source of observation (1)
52- 59 A8 --- Obs Observatory (Fairborn or KPNO) (2)
61- 70 A10 --- Inst Instrument (TRES, CORAVEL, DS or coude feed) (3)
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Note (1): Place/Source of observation as follows:
CfA = Harvard-Smithsonian Center for Astrophysics;
TSU = Tennessee State University;
UofA = University of Arkansas;
IM85 = Imbert (1985A&AS...59..357I 1985A&AS...59..357I).
Note (2):
KPNO = Kitt Peak National Observatory;
Note (3): Instrument as follows:
CORAVEL = CORAVEL spectrometer;
TRES = Tillinghast Reector Echelle Spectrograph (a bench-mounted
fiber-fed echelle instrument);
DS = Digital Speedmeter (a Cassegrain-mounted echelle spectrograph);
coude feed = coude-feed telescope.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.1 yr Year [1931.8/2011.6] Date of minimum light
9- 19 F11.5 d HJD [26631.3/55779.8] Heliocentric Julian Date;
HJD-2400000
21- 27 F7.5 d e_HJD Error on HJD (precision)
29- 33 I5 --- Cycle [-2573/27] Cycle number
35 I1 --- Type [1/2] Eclipse type (1=deeper eclipse) (1)
37- 44 F8.5 d O-C [-0.11955/0.14833] (O-C) residual
46- 48 A3 --- Meth Observational method (pe=photoelectric,
pg=photographic or vis=visual)
50- 51 I2 --- Ref Reference (in refs.dat file)
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Note (1): Eclipses of type 1 are the deeper eclipses when the hotter, less
massive component (star B) is being eclipsed by the cooler, more
massive component (star A).
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.5 --- Phase Orbital phase
9- 13 F5.3 mag DVmag URSA differential V band magnitude
15- 25 F11.5 d HJD [52314/55831] Heliocentric Julian Date;
HJD-2400000
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.5 --- Phase [0/1] Orbital phase
9- 13 F5.3 mag DVmag NFO differential V band magnitude
15- 25 F11.5 d HJD [53447/55831] Heliocentric Julian Date;
HJD-2400000
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref [1/22] Reference number
4- 22 A19 --- BibCode Bibliographic code
24- 40 A17 --- Aut Author's name
42- 92 A51 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 01-Jul-2013