J/MNRAS/415/563 Elemental abundances in Hyades supercluster (De Silva+, 2011) ================================================================================ High-resolution elemental abundance analysis of the Hyades supercluster. De Silva G.M., Freeman K.C., Bland-Hawthorn J., Asplund M., Williams M., Holmberg J. =2011MNRAS.415..563D ================================================================================ ADC_Keywords: Clusters, open ; Stars, nearby ; Abundances Keywords: Galaxy: abundances - Galaxy: disc - open clusters and associations: individual: Hyades supercluster Abstract: The existence of a kinematically defined moving group of stars centred at U=-40, V=-17km/s, referred to as the Hyades supercluster, has been suggested to be the debris of an originally large star-forming event, with its core being the present-day Hyades open cluster. Using high-resolution UV-Visual Echelle Spectrograph (UVES) spectra, we present the elemental abundances for a range of alpha, Fe-peak and neutron-capture elements for 26 proposed supercluster stars. Our results show that the sample stars display a heterogeneous abundance distribution, with a clump around [Fe/H]=+0.15. We also calculate stellar radial velocities and U, V, W space velocities. Enforcing strict chemical and kinematical membership criteria, we find that four supercluster stars share the Hyades open cluster abundances and kinematics, while many of the remaining stars fit the disc field kinematics and abundance range. We discuss our findings in the context of the Hyades supercluster being a dispersed star-forming remnant, a stellar stream of purely dynamical origin or a result of several processes. Description: High-resolution and high signal-to-noise ratio spectra of probable members of the Hyades supercluster were observed using the VLT UV-Visual Echelle Spectrograph (UVES) at UT2 in the framework of programmes 080.D-0094(A) and 381.B-0045(A). A total of 45 probable member stars were submitted for service mode observations, using the UVES Red arm standard setting at 520 nm which provides complete spectral coverage from 4200 to 6200{AA}, and employed a 0.8-arcsec slit to achieve a spectral resolving power of 60000. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 51 44 Total sample of observed stars table2.dat 26 345 Line list tables.dat 195 26 *Spectroscopic stellar parameters for 26 stars, elemental abundances, absolute magnitudes, distances, radial and Galactic space velocities for 20 stars. -------------------------------------------------------------------------------- Note on tables.dat: from tables 3, 4, 6 and 7 of the paper. -------------------------------------------------------------------------------- See also: J/AZh/77/96 : Abundances in Hyades red giants (Boyarchuk+, 2000) J/AJ/127/3579 : Radial velocities of Hyades stars (Paulson+, 2004) J/A+A/523/A71 : A and F stars abundances in the Hyades (Gebran+, 2010) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 12 I2 h RAh Right ascension (J2000) 14- 15 I2 min RAm Right ascension (J2000) 17- 23 F7.4 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 37 F6.3 arcsec DEs Declination (J2000) 39- 42 F4.2 mag Vmag V magnitude 44- 47 F4.2 mag B-V B-V colour index 49- 51 A3 --- Notes Notes (1) -------------------------------------------------------------------------------- Note (1): E98 indicates stars selected from Eggen (1998AJ....115.2453E) and W indicates those selected from Wilson's thesis. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 F8.3 0.1nm lambda Wavelength 10- 13 A4 ---- Ion Species 15- 19 F5.3 eV LEP Line energy potential 21- 26 F6.3 [-] loggf Oscillator strength -------------------------------------------------------------------------------- Byte-by-byte Description of file: tables.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 14 I4 K Teff Effective temperature 16- 18 F3.1 [cm/s2] logg Surface gravity 20- 23 F4.2 km/s ksi Microturbulence velocity {xi} 25- 29 F5.2 [Sun] [Fe/H] ? Elemental abundance [Fe/H] 31- 35 F5.2 [Sun] [Na/H] ? Elemental abundance [Na/H] 37- 41 F5.2 [Sun] [Mg/H] ? Elemental abundance [Mg/H] 43- 46 F4.2 [Sun] [Al/H] ? Elemental abundance [Al/H] 48- 51 F4.2 [Sun] [Si/H] ? Elemental abundance [Si/H] 53- 57 F5.2 [Sun] [S/H] ? Elemental abundance [S/H] 59- 63 F5.2 [Sun] [Ca/H] ? Elemental abundance [Ca/H] 65- 69 F5.2 [Sun] [Sc/H] ? Elemental abundance [Sc/H] 71- 75 F5.2 [Sun] [Ti/H] ? Elemental abundance [Ti/H] 77- 81 F5.2 [Sun] [Cr/H] ? Elemental abundance [Cr/H] 83- 87 F5.2 [Sun] [Mn/H] ?=- Elemental abundance [Mn/H] 89- 93 F5.2 [Sun] [Co/H] ? Elemental abundance [Co/H] 95- 99 F5.2 [Sun] [Ni/H] ? Elemental abundance [Ni/H] 101-105 F5.2 [Sun] [Zn/H] ? Elemental abundance [Zn/H] 107-111 F5.2 [Sun] [Zr/H] ? Elemental abundance [Zr/H] 113-117 F5.2 [Sun] [Ba/H] ?=- Elemental abundance [Ba/H] 119-123 F5.2 [Sun] [La/H] ?=- Elemental abundance [La/H] 125-129 F5.2 [Sun] [Ce/H] ?=- Elemental abundance [Ce/H] 131-136 F6.3 mag VMAG ? Absolute V magnitude 139-144 F6.1 pc Dist ? Distance 146-151 F6.2 km/s RV ? Radial velocity 153-156 F4.2 km/s e_RV ? rms uncertainty on RV 158-163 F6.2 km/s Uvel ? U velocity 165-169 F5.2 km/s e_Uvel ? rms uncertainty on Uvel 171-176 F6.2 km/s Vvel ? V velocity 178-182 F5.2 km/s e_Vvel ? rms uncertainty on Vvel 184-189 F6.2 km/s Wvel ? W velocity 191-195 F5.2 km/s e_Wvel ? rms uncertainty on Wvel -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 20-Feb-2012