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J/ApJ/613/312  Synthetic Lick indices of alpha-enhanced stars (Franchini+, 2004)

Synthetic Lick indices and detection of α-enhanced stars. II. F, G, and K stars in the -1.0 < [Fe/H] < +0.50 range. Franchini M., Morossi C., Di Marcantonio P., Malagnini M.L., Chavez M., Rodriguez-Merino L. <Astrophys. J., 613, 312-321 (2004)> =2004ApJ...613..312F
ADC_Keywords: Abundances, [Fe/H] ; Stars, late-type Keywords: Galaxy: stellar content - stars: abundances - stars: kinematics - stars: late-type Abstract: We present an analysis of 402 F, G, and K solar neighborhood stars, with accurate estimates of [Fe/H] in the range -1.0 to +0.5dex, aimed at the detection of α-enhanced stars and at the investigation of their kinematical properties. The analysis is based on the comparison of 571 sets of spectral indices in the Lick/IDS system, coming from four different observational data sets, with synthetic indices computed with solar-scaled abundances and with α-element enhancement. We use selected combinations of indices to single out α-enhanced stars without requiring previous knowledge of their main atmospheric parameters. By applying this approach to the total data set, we obtain a list of 60 bona fide α-enhanced stars and of 146 stars with solar-scaled abundances. The properties of the detected α-enhanced and solar-scaled abundance stars with respect to their [Fe/H] values and kinematics are presented. A clear kinematic distinction between solar-scaled and α-enhanced stars was found, although a one-to-one correspondence to "thin disk" and "thick disk" components cannot be supported with the present data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 53 402 Detection of α-enhanced candidate stars
See also: J/ApJ/601/485 : Synthetic Lick indices of alpha-enhanced stars (Franchini+, 2004) J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994) J/PASP/113/1365 : Super-metal-rich stars (Buzzoni+, 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD The HD number 8- 16 A9 --- SpType SIMBAD MK spectral type 18- 23 F6.3 [Sun] [Fe/H] Log of the Fe/H number abundance 25- 29 F5.3 [Sun] e_[Fe/H] Error in [Fe/H] 31 A1 --- LC [dg]Luminosity code (1) 33- 36 A4 --- Cananea The Cananea classification (2) 38- 41 A4 --- STELIB The STELIB classification (2) 43- 46 A4 --- ELODIE The ELODIE classification (2) 48- 51 A4 --- Worthey The Worthey classification (2) 53 A1 --- Class Star classification with respect to α-enhancement (3)
Note (1): Type code: d = dwarf; g = giant. Note (2): In the following 4 character wide columns we indicate the presence of the star in each data-set and its classification with respect to α-enhancement in each of the four index-index diagrams. The capital letter "Y" is used for bona fide α-enhanced candidates and the capital letter "N" is used for SSA (solar-scaled abundance) candidates. The stars marked with "////" are too cool to be compared with our SSA and NSSA (non-SSA) grids; their low temperatures are inferred from the position of the observed points in the diagrams and confirmed by looking at data in Taylor (2003, Cat. J/A+A/398/721) and by using temperature estimates from broad-band photometry. Note (3): Star classification with respect to α-enhancement as follows: ? = No classification achieved; S = Classified as SSA (solar-scaled abundance); A = Classified as α-enhanced; C = Contradictory case (HD 43318 and HD 198149: it is very likely that in both cases the discrepancy can be attributed to observational problems).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Feb-2005
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