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.
<Mon. Not. R. Astron. Soc., 415, 563-575 (2011)>
=2011MNRAS.415..563D 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 6200Å, and employed a 0.8-arcsec slit
to achieve a spectral resolving power of 60000.
File Summary:
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FileName Lrecl Records Explanations
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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.
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Note on tables.dat: from tables 3, 4, 6 and 7 of the paper.
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): E98 indicates stars selected from Eggen (1998AJ....115.2453E 1998AJ....115.2453E) and
W indicates those selected from Wilson's thesis.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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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 ξ
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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Feb-2012