J/AJ/147/148 Spectroscopy and photometry of AP And (Lacy+, 2014) ================================================================================ Absolute properties of the eclipsing binary star AP Andromedae. Lacy C.H.S., Torres G., Fekel F.C., Muterspaugh M.W. =2014AJ....147..148L ================================================================================ ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry, CCD Keywords: binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: individual: AP And Abstract: AP And is a well-detached F5 eclipsing binary star for which only a very limited amount of information was available before this publication. We have obtained very extensive measurements of the light curve (19097 differential V magnitude observations) and a radial velocity curve (83 spectroscopic observations) which allow us to fit orbits and determine the absolute properties of the components very accurately: masses of 1.277+/-0.004 and 1.251+/-0.004M_{sun}_, radii of 1.233+/-0.006 and 1.1953+/-0.005R_{sun}_, and temperatures of 6565+/-150K and 6495+/-150K. The distance to the system is about 400+/-30pc. Comparison with the theoretical properties of the stellar evolutionary models of the Yonsei-Yale series of Yi et al. shows good agreement between the observations and the theory at an age of about 500 Myr and a slightly sub-solar metallicity. Description: AP And was monitored spectroscopically with three different instruments over more than 9yr. Observations began at the Harvard-Smithsonian CfA with the 1.5m telescope at the F. L. Whipple Observatory (Mount Hopkins, AZ). A single echelle order 45{AA} wide centered at about 5187{AA} (MgI b triplet) was recorded with an intensified photon-counting Reticon detector (digital speedometer, DS), with a resolving power of approximately R=35000. A total of 16 spectra were collected between 2004 January and 2008 October. Additional observations were gathered on the same telescope using the bench-mounted Tillinghast Reflector Echelle Spectrograph (TRES), from 2009 October to 2013 January. The resolving power of this instrument is R=44000, and the wavelength coverage is 3900-9100{AA}. A further 41 echelle spectrograms of AP And were collected from 2011 October to 2013 October using the Tennessee State University 2m telescope and a fiber fed echelle spectrograph. The detector was a Fairchild 486 CCD. The resulting echelle spectrograms have 48 orders and have a wavelength coverage of 3800-8260{AA}. We used a fiber that produced a resolving power of 15000 at 6000{AA}. Sets of V-band differential photometry were obtained from images taken by two independent robotic telescopes, the URSA WebScope at the University of Arkansas campus and the NFO WebScope near Silver City, NM, USA. The URSA WebScope is constructed from a 10inch diameter f/6.3 Meade LX200 Schimdt-Cassegrain telescope with an SBIG ST8 CCD camera, inside a Technical Innovations Robo-Dome. The NFO WebScope is constructed from a Group 128 24 inch diameter classical Cassegrain telescope with a Kodak KAF 4300E CCD camera. Both telescopes used Bessel V filters. The star was observed with URSA from 2003 July 11 to 2012 July 13 and with the NFO from 2004 December 17 to 2013 December 2. Objects: -------------------------------------------------------------------- RA (ICRS) DE Designation(s) (Period) -------------------------------------------------------------------- 23 49 30.71 +45 47 21.3 AP And = TYC 3639-915-1 (P=1.587291156) -------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 33 135 Observed dates of minimum light for AP And table2.dat 52 83 Heliocentric radial velocities for AP And table4.dat 26 7895 V-band differential photometry (variable-comps) of AP And from the URSA WebScope (at Kimpel Observatory, Arkansas) table5.dat 26 11209 V-band differential photometry (variable-comps) of AP And from the NFO WebScope (near Silver City, New Mexico) refs.dat 81 20 References -------------------------------------------------------------------------------- See also: B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013) J/AJ/147/1 : Spectroscopy and photometry of HP Aur (Lacy+, 2014) J/AJ/142/185 : Properties of the eclipsing binary stars HY Vir (Lacy+, 2011) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 F11.5 d HJD Heliocentric Julian Date (HJD-2400000) 13 I1 --- Type Eclipse type (1 or 2) (1) 15- 21 F7.5 d e_HJD Uncertainty in HJD 23- 30 F8.5 d O-C The (O-C) residual 32- 33 I2 --- Ref Reference; in refs.dat file -------------------------------------------------------------------------------- Note (1): Eclipses of type 1 are the deeper eclipses when the hotter, more massive star (star A) is being eclipsed by the cooler, less massive star (star B). -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- Inst Facility/Instrument used (1) 10- 19 F10.4 d HJD Heliocentric Julian Date (HJD-2400000) 21- 27 F7.2 km/s RVA Radial velocity of A component 29- 35 F7.2 km/s RVB Radial velocity of B component 37- 40 F4.2 km/s e_RVA ? Uncertainty in RVA 42- 45 F4.2 km/s e_RVB ? Uncertainty in RVB 47- 52 F6.4 --- Phase Phase (2) -------------------------------------------------------------------------------- Note (1): Instruments used are defined as follows: CfA/DS = Harvard-Smithsonian Center for Astrophysics/Digital Speedometer; CfA/TRES = Harvard-Smithsonian Center for Astrophysics/Tillinghast Reflector Echelle Spectrograph; FAIRBORN = A robotic telescope at Fairborn Observatory. Note (2): Based on the ephemeris in Section 2. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[45].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 F7.5 --- Phase Orbital phase (1) 9- 14 F6.3 mag DVmag Differential V band magnitude 16- 26 F11.5 d HJD Heliocentric Julian Date (HJD-2400000) -------------------------------------------------------------------------------- Note (1): The orbital phase has been computed from the photometric values in Equation (1): HJD MinI=2454717.65759(2)+1.587291156(33)E. -------------------------------------------------------------------------------- Byte-by-byte Description of file: refs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode Bibliographic code 24- 40 A17 --- Aut Author's name 42- 81 A40 --- Com Comments -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 07-Oct-2014