J/AJ/149/63 Radial velocities of HD 54371, HR 2692, and 16 UMa (Fekel+, 2015) ================================================================================ New precision orbits of bright double-lined spectroscopic binaries. IX. HD 54371, HR 2692, and 16 Ursa Majoris. Fekel F.C., Williamson M.H., Muterspaugh M.W., Pourbaix D., Willmarth D., Tomkin J. =2015AJ....149...63F ================================================================================ ADC_Keywords: Binaries, spectroscopic ; Radial velocities Keywords: binaries: spectroscopic - stars: fundamental parameters - stars: individual: HD 54371, HR 2692, 16 UMa - stars: late-type Abstract: With extensive sets of new radial velocities we have determined orbital elements for three previously known spectroscopic binaries, HD 54371, HR 2692, and 16 UMa. All three systems have had the lines of their secondaries detected for the first time. The orbital periods range from 16.24 to 113.23days, and the three binaries have modestly or moderately eccentric orbits. The secondary to primary mass ratios range from 0.50 to 0.64. The orbital dimensions (a_1_sini and a_2_sini) and minimum masses (m_1_sin^3^i and m_2_sin^3^i) of the binary components all have accuracies of {<=}1%. With our spectroscopic results and the Hipparcos data, we also have determined astrometric orbits for two of the three systems, HR 2692 and 16 UMa. The primaries of HD 54371 and 16 UMa are solar-type stars, and their secondaries are likely K or M dwarfs. The primary of HR 2692 is a late-type subgiant and its secondary is a G or K dwarf. The primaries of both HR 2692 and 16 UMa may be pseudosynchronously rotating, while that of HD 54371 is rotating faster than its pseudosynchronous velocity. Description: We obtained our observations of the three program stars at three observatories. Most of our spectrograms were acquired from 2003 through 2014 at Fairborn Observatory near Washington Camp in southeast Arizona with the Tennessee State University 2m automatic spectroscopic telescope (AST) and fiber-fed echelle spectrograph. Initially, the detector was a 2048*4096 SITe ST-002A CCD with 15{mu}m pixels. Those AST echelle spectrograms have 21 orders that span the wavelength region 4920-7100{AA} and have an average resolution of 0.17{AA} or a resolving power of 35000 at 6000{AA}. The S/N of these observations at 6000{AA} generally ranged from 40 to 60. The SITe CCD and its dewar were removed from the AST in the summer of 2011. They were replaced by a Fairchild 486 CCD having a 4096*4096 array of 15{mu}m pixels and a new dewar. The new echelle spectrograms have 48 orders that range from 3800 to 8260{AA}. We also installed a 200{mu}m diameter fiber that produces a resolution of 0.24{AA} or a resolving power of 25000 at 6000{AA} for the new echelle spectra. Observations with the new detector, dewar, and fiber resulted in much improved S/N that, depending on sky conditions, ranged from 100 to 200 at 6000{AA}. Spanning the years 2000-2004, Abt & Willmarth 2006 (cat. J/ApJS/162/207) acquired additional spectrograms of the three binaries at Kitt Peak National Observatory (KPNO) as part of a survey of solar-type stars that examined their binary frequency and mass ratio distribution. They obtained those observations with the 0.9m coude feed telescope, coude spectrograph, and a CCD detector identified as F3KB. The spectra covered 320{AA}, centered on 5200{AA}, and had a resolution of 0.11{AA}/pixel or a 2 pixel resolving power of 24000. The S/N of the spectra ranged from 40 to 80. In 2002 and 2003 we collected several spectrograms at McDonald Observatory with the 2.1m telescope, the Sandiford Cassegrain echelle spectrograph, and a Reticon CCD. The wavelength region covered by those spectra ranges from 5700 to 7000{AA}. They have a resolution of 0.13{AA} that corresponds to a resolving power of 49000 at 6350{AA}. At that central wavelength, the S/N of the spectra are ~200. Finally, from 2003 through 2007 we acquired several additional spectra at KPNO with the coude feed telescope, coude spectrograph, and a Texas Instruments CCD detector. Those spectra are centered at 6430{AA}, cover a wavelength range of 84{AA}, and have a resolution of 0.21{AA} or a resolving power of just over 30000. They have S/N of ~150. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 53 3 Basic properties of the program stars table3.dat 51 202 Radial velocities of HD 54371 table5.dat 51 261 Radial velocities of HR 2692 table7.dat 51 134 Radial velocities of 16 UMa -------------------------------------------------------------------------------- See also: B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014) J/AJ/146/129 : Orbits of 4 double-lined spectroscopic binaries (Fekel+, 2013) J/AJ/145/111 : Radial velocities of 5 spectroscopic binaries (Fekel+, 2013) J/AJ/145/41 : Radial velocities of 33 spectroscopic binaries (Katoh+, 2013) J/ApJS/180/117 : MK classifications of spectroscopic binaries (Abt, 2009) J/ApJ/695/1527 : HR 8257: orbit and basic properties (Fekel+, 2009) J/A+A/442/365 : Astrometric orbits of SB9 stars (Jancart+, 2005) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 A6 --- Name Common name of the star 8- 11 I4 --- HR ? HR number of the star 13- 17 I5 --- HD HD number of the star 19- 23 I5 --- HIP HIP number of the star (added at CDS) 25- 29 A5 --- SpT Spectral type (from this work) 31- 34 F4.2 mag Vmag V-band magnitude (1) 36- 40 F5.3 mag B-V The (B-V) color index (1) 42- 46 F5.2 mas Plx Parallax (2) 48- 53 F6.2 d Per [16/114] Period -------------------------------------------------------------------------------- Note (1): From Perryman et al. (1997, cat. I/239). Note (2): From van Leeuwen (2007, cat. I/311). -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[357].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.3 d HJD Heliocentric Julian date (HJD-2400000) 11- 15 F5.3 --- Phase Fractional phase 17- 21 F5.1 km/s RV1 Radial velocity of primary 23- 26 F4.1 km/s O-C1 Velocity residual of primary (O-C)_1_ 28- 30 F3.1 --- w_RV1 Weight of primary velocity 32- 36 F5.1 km/s RV2 ? Radial velocity of secondary 38- 41 F4.1 km/s O-C2 ? Velocity residual of secondary (O-C)_2_ 43- 46 F4.2 --- w_RV2 ? Weight of secondary velocity 48- 51 A4 --- Obs Observatory source (Fair, McD, KPNO) (1) -------------------------------------------------------------------------------- Note (1): Observatory identification defined as follows: McD = McDonald Observatory; KPNO = Kitt Peak National Observatory; Fair = Fairborn Observatory. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Tomkin & Fekel, Paper I, 2006AJ....131.2652T Tomkin & Fekel, Paper II, 2008AJ....135..555T Fekel et al., Paper III, 2009AJ....137.3900F Fekel et al., Paper IV, 2010AJ....139.1579F Fekel et al., Paper V, 2010AJ....140.1381F Fekel et al., Paper VI, 2011AJ....141..145F Fekel & Williamson, Paper VII, 2011AJ....142...69F Fekel et al., Paper VIII, 2013AJ....146..129F, cat. J/AJ/146/129 Fekel et al., Paper X., 2017AJ....154..120F ================================================================================ (End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 24-Feb-2015