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J/AJ/153/128  WOCS. LXXV. Hyades&Praesepe stellar lithium data (Cummings+, 2017)

WIYN open cluster study. LXXV. Testing the metallicity dependence of stellar lithium depletion using Hyades-aged clusters. I. Hyades and Praesepe. Cummings J.D., Deliyannis C.P., Maderak R.M., Steinhauer A. <Astron. J., 153, 128-128 (2017)> =2017AJ....153..128C (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Stars, double and multiple ; Photometry, UBV ; Abundances ; Effective temperatures ; Equivalent widths ; Radial velocities Keywords: open clusters and associations: individual: The Hyades, Praesepe - stars: abundances - stars: evolution Abstract: WIYN/Hydra spectroscopy (at R∼15000) of the moderately metal-rich Praesepe and Hyades open clusters was used to study their main-sequence (MS) iron ([Fe/H]) and lithium (A(Li)) abundances. Self-consistent [Fe/H] and Li analyses of these clusters of consistent age, which we re-evaluate, confirms that they have consistent [Fe/H] and provides a foundation to investigate the poorly understood G-dwarf and F-dwarf Li-depletions. Neither phenomenon agrees with standard stellar evolution theory, but possible explanations abound. We supplement our A(Li) with previously published results placed on a uniform abundance scale. This creates the largest self-consistently analyzed sample of A(Li) in both the Hyades (90) and Praesepe (110). For each star, high-precision UBVRI photometry was used to determine a 10-color-based Teff and then to test for photometric peculiarities indicated by a large σTeff (>75 K). The stars that have large σTeff were predominantly found to be binaries or stars with peculiar (apparent) A(Li). When considering only proper-motion members that have low σTeff and are also photometrically consistent with the cluster MS fiducial, each cluster has a more tightly defined Li morphology than previously observed and the two clusters' A(Li) are indistinguishable. This suggests that clusters of consistent age and metallicity may have consistent Li-depletion trends across a broad range of Teff; no additional major parameters are required, at least for these two clusters. We propose that the combined Hyades and Praesepe data offer more rigorous constraints than does either cluster alone, and we discuss newly revealed features of the combined Li-Teff trend. Description: The Hyades and Praesepe open star clusters were both observed using the Hydra multi-object spectrograph on the WIYN 3.5-meter telescope using the 316@63.4 echelle grating in order 8 with the X19 filter. The spectra span from 6450 to 6850 Å. All Hyades stars and a majority of Praesepe stars were observed with blue cable, which yielded R∼13600. The remaining Praesepe stars were observed with the red cable, which yielded a moderately higher R∼17600. The Hyades data were acquired over seven nights from 2009 February 2 to 23. Using two red-cable configurations, we obtained spectra of 34 Praesepe candidate cluster members on 1997 November 16 and 18. Using seven blue cable configurations, we obtained spectra of 66 candidate cluster members during seven nights on 2001 December 2; 2005 May 1 and 2; 2006 January 25 and 26; and 2006 February 2 and 3. Objects: ------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------ 04 26 54.00 +15 52 00.0 Hyades = NAME Hyades Cluster 08 40 24 +19 40.0 Praesepe = NGC 2632 ------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 105 90 Stellar Lithium Data for The Hyades table7.dat 105 110 Stellar Lithium Data for Praesepe
See also: J/AJ/106/1080 : Lithium in Praesepe (Soderblom+, 1993) J/A+A/310/879 : Hyades binaries (Barrado+, 1996) J/A+A/331/81 : Hyades membership (Perryman+ 1998) J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999) J/A+A/354/881 : Radial velocities of Praesepe + Hyades Am stars (Debernardi+ 2000) J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001) J/A+A/382/899 : BVI photometry in M67 (Stassun+, 2002) J/AJ/124/601 : Absolute positions and proper motions in NGC 188 (Platais+, 2002) J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003) J/AJ/127/3579 : Radial velocities of Hyades stars (Paulson+, 2004) J/ApJS/159/100 : Temperatures and Rc photometry in the Hyades (Taylor+, 2005) J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007) J/A+A/484/609 : BVI photometry and proper motions in M67 (Yadav+, 2008) J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008) J/MNRAS/391/1482 : BVIc photometry of Trumpler 20 (Platais+, 2008) J/A+A/498/949 : Velocities of 1253 F-K dwarfs in open clusters (Mermilliod+, 2009) J/AJ/137/3743 : Spectroscopic binary orbits in NGC 188 (Geller+, 2009) J/AJ/137/5086 : NGC 188 V12 VI light curves (Meibom+, 2009) J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009) J/ApJ/695/679 : Stellar rotation in M35 (Meibom+, 2009) J/A+A/515/A100 : VI light curves of NGC 1039 solar-type stars (James+, 2010) J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010) J/AJ/139/2034 : NGC 6253 stars equivalent widths (Anthony-Twarog+, 2010) J/A+A/531/A92 : Deep all-sky census of the Hyades (Roeser+, 2011) J/ApJ/733/115 : Rotation periods and membership in M34 (Meibom+, 2011) J/MNRAS/413/1024 : Deep proper-motion survey of Blanco 1 (Platais+, 2011) J/MNRAS/413/2218 : Stellar rotation in Hyades and Praesepe (Delorme+, 2011) J/A+A/541/A150 : Lithium in M67 and Hyades (Pace+, 2012) J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013) J/AJ/148/38 : WIYN open cluster study. LX. RV survey of NGC 6819 (Milliman+, 2014) J/AJ/148/51 : WIYN Open Cluster. LXI. NGC 6819 photometry (Anthony-Twarog+, 2014) J/AJ/148/61 : WIYN open cluster study. LIX. RVs of NGC 6791 (Tofflemire+, 2014) J/AJ/148/85 : WIYN open cluster study. LXII. Photometry of M35 (Thompson+, 2014) J/ApJ/784/57 : Photometry and proper motions in Praesepe (Wang+, 2014) J/ApJ/795/161 : Activity and rotation in Praesepe and the Hyades (Douglas+, 2014) J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015) J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015) J/AJ/150/97 : Radial velocities in M67. I. 1278 candidate members (Geller+, 2015) J/AJ/151/152 : WOCS. LXXI. Spectroscopy of 5 stars in NGC 6791 (Milliman+, 2016) J/AJ/152/192 : WOCS. LXXII. A uvbyCaHb study of NGC 2506 (Anthony-Twarog+, 2016) Byte-by-byte Description of file: table6.dat table7.dat
Bytes Format Units Label Explanations
1 A1 --- Group [ABCD] Data group (1) 3- 11 A9 --- ID Star identifier (vB NNN, for most stars in table 6; KW NNN in table 7) 13 A1 --- n_ID [ab] Note on ID (2) 15- 19 F5.3 mag (B-V)mean [0.194/1.225] Mean (B-V) color index 21- 26 F6.1 K Teff [4301.9/7623] Effective temperature 28- 32 F5.1 K e_Teff [6.3/373.9]? Uncertainty in Teff 33 A1 --- n_Teff [*] Note on Teff (only in table 6) (3) 35- 40 F6.2 0.1pm EW(Li) [3/121.06]? Lithium equivalent width (mÅ) 42- 45 F4.2 0.1pm e_EW(Li) [0.59/5.93]? Uncertainty in EW(Li) 47- 51 F5.3 [-] A(Li) [0/3.41] Lithum abundance 53- 57 F5.3 [-] e_A(Li)S/N [0.005/0.097]? S/N-based uncertainty for A(Li) 59- 63 F5.3 [-] e_A(Li)Teff [0.01/0.269]? Teff-based uncertainty for A(Li) 65- 68 I4 --- S/N [120/1500]? Signal-to-noise ratio per pixel 70- 74 I5 s Exp1 [150/10945]? Total exposure time (only in table 6) 76- 80 A5 "h:m:s" Exp2 ? Total exposure time (only in table 7) 82 A1 --- l_vsini [<] Limit flag on vsini 83- 87 F5.1 km/s vsini [1.5/210]? Rotational broadening (4) 89- 93 F5.2 km/s RV [17.8/64.53]? Radial velocity (5) 95- 99 F5.2 km/s e_RV [0.06/24.43]? 1σ uncertainty in RV 101 I1 --- Ref [1/9] Reference (6) 103-105 A3 --- Prime [yes-] Prime sample member? (7)
Note (1): Group as follows: A = Single-star detection; B = Spectroscopic binary based on Perryman et al. (1998, J/A+A/331/81; and references therein); C = Single-star 3σ upper limit; D = Spectroscopic binary 3σ upper limit. Note (2): Note as follows: a = Short Period Tidally Locked Binary (SPTLB); b = Star that deviate from the single-star fiducial (see Figure 3). Note (3): Note as follows: * = 13 of the stars we analyzed from Thorburn et al. (1993ApJ...415..150T), Boesgaard & Tripicco (1986ApJ...302L..49B) and Boesgaard & Budge (1988ApJ...332..410B) have clearly discrepant photometry in comparison to the Hyades MS fiducial in MV space. Therefore, their Teff was not determined using our derived color relations because they would not be appropriate. Their final Teff are thus based only on their Johnson & Knuckles (1955ApJ...122..209J) B-V and they have increased uncertainty. Note (4): In table 6, the source for vsini of the Boesgaard & Tripicco (1986ApJ...302L..49B) and Boesgaard & Budge (1988ApJ...332..410B) stars (3) are Kraft (1965ApJ...142..681K) but scaled to our measurements. The source for vsini of the Burkhart & Coupry (1989A&A...220..197B) stars (5) are Debernardi et al. (2000, J/A+A/354/881). In table 7, the source for v sin i of stars we did not observe is Mermilliod et al. (2009, J/A+A/498/949). Note (5): In table 6, the source for radial velocities of stars we did not observe is Perryman et al. (1998, J/A+A/331/81) (and references therein) and for vB 99 and vB 182 it is Griffin et al. (1988AJ.....96..172G). In table 7, the source for radial velocities of stars we did not observe is Mermilliod et al. (2009, J/A+A/498/949). Note (6): Reference as follows: 1 = Our WIYN/Hydra sample; 2 = Thorburn et al. (1993ApJ...415..150T); 3 = Boesgaard & Budge (1988ApJ...332..410B) and Boesgaard & Tripicco (1986ApJ...302L..49B); 4 = Soderblom et al. (1990AJ.....99..595S); 5 = Burkhart & Coupry (1989A&A...220..197B); 6 = Takeda et al. (2013PASJ...65...65T); 7 = Boesgaard et al. (2013ApJ...775...58B); 8 = Soderblom et al. (1993, J/AJ/106/1080); 9 = Burkhart & Coupry (1998A&A...338.1073B). Note (7): For each cluster, we define a "prime" subsample consisting of probable members with low e_Teff and no measurable spectroscopic evidence of contamination from a secondary (from fxcor), even if they are known binaries from other studies.
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(End) Tiphaine Pouvreau [CDS] 14-May-2018
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