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J/ApJ/601/485  Synthetic Lick indices of alpha-enhanced stars (Franchini+, 2004)

Synthetic Lick indices and detection of α-enhanced stars. Franchini M., Morossi C., Di Marcantonio P., Malagnini M.L., Chavez M., Rodriguez-Merino L. <Astrophys. J., 601, 485-499 (2004)> =2004ApJ...601..485F
ADC_Keywords: Stars, late-type ; Abundances Keywords: Galaxy: stellar content - stars: abundances - stars: late-type Abstract: Synthetic Lick indices computed with solar scaled abundances and with α-element enhancement are presented and compared with predictions from both theoretical computations (Tripicco & Bell (1995AJ....110.3035T); Thomas, Maraston, & Bender (2003MNRAS.339..897T); Barbuy et al., 2003, Cat. J/A+A/404/661) and empirical fitting functions (de Freitas Pacheco, 1996MNRAS.278..841D). We propose selected combinations of indices capable of singling out α-enhanced stars without requiring previous knowledge of their main atmospheric parameters. By applying this approach to the 460 stars in the Worthey et al. (1994, Cat. J/ApJS/94/687) catalog, we detected a list of 82 candidate α-enhanced stars. The confirmation of α-enhancement was obtained by searching the literature for individual element abundance determinations from high-resolution spectroscopy for a subsample of 34 stars. Preliminary discussion of the properties of the detected α-enhanced stars with respect to their [Fe/H] values and kinematics is presented. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 69 56 The α enhanced candidate stars from the four panels of Figure 8 (Ca4227) table1b.dat 69 47 The α enhanced candidate stars from the four panels of Figure 8 (Mg2) table1c.dat 69 17 The α enhanced candidate stars from the four panels of Figure 8 (Mgb) table1d.dat 69 59 The α enhanced candidate stars from the four panels of Figure 8 (CaMg) table2.dat 62 34 α-Enhanced Candidate Stars Discussed in the Text
See also: J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994) Byte-by-byte Description of file: table1a.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? HD number 7- 9 A3 --- m_HD Multiplicity index on HD 11- 24 A14 --- OID1 First other identifier 26- 42 A17 --- OID2 Second other identifier 44- 48 F5.3 0.1nm Ca4227 The Lick Ca4227 index in Angstroms 50- 55 F6.3 0.1nm NaD The Lick NaD index in Angstroms 57- 62 F6.3 --- da Dimensionless distance (G1) 64- 69 F6.3 [Sun] [Fe/H] ? Log of the iron to hydrogen abundance
Byte-by-byte Description of file: table1b.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? HD number 7- 9 A3 --- m_HD Multiplicity index on HD 11- 24 A14 --- OID1 First other identifier 26- 42 A17 --- OID2 Second other identifier 44- 48 F5.3 0.1nm Mg2 The Lick Mg2 index in Angstroms 50- 55 F6.3 0.1nm NaD The Lick NaD index in Angstroms 57- 62 F6.3 --- db Dimensionless distance (G1) 64- 69 F6.3 [Sun] [Fe/H] ? Log of the iron to hydrogen abundance
Byte-by-byte Description of file: table1c.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? HD number 7- 9 A3 --- m_HD Multiplicity index on HD 11- 24 A14 --- OID1 First other identifier 26- 42 A17 --- OID2 Second other identifier 44- 48 F5.3 0.1nm Mgb The Lick Mgb index in Angstroms 50- 55 F6.3 0.1nm NaD The Lick NaD index in Angstroms 57- 62 F6.3 --- dc Dimensionless distance (G1) 64- 69 F6.3 [Sun] [Fe/H] ? Log of the iron to hydrogen abundance
Byte-by-byte Description of file: table1d.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? HD number 7- 9 A3 --- m_HD Multiplicity index on HD 11- 24 A14 --- OID1 First other identifier 26- 42 A17 --- OID2 Second other identifier 44- 48 F5.3 0.1nm CaMg The Lick CaMg index in Angstroms 50- 55 F6.3 0.1nm NaD The Lick NaD index in Angstroms 57- 62 F6.3 --- dd Dimensionless distance (G1) 64- 69 F6.3 [Sun] [Fe/H] ? Log of the iron to hydrogen abundance
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 7 A1 --- m_HD Multiplicity index on HD 9- 14 F6.3 --- [Fe/H] Metallicity 16- 19 F4.2 0.1nm NaD NaD index 21- 24 F4.2 0.1nm Ca4227 ? Ca4227 index 26- 29 F4.2 --- da ? Distance of the corresponding point from the boundary line of NaD-Ca4227 diagram (1) 31- 35 F5.3 0.1nm Mg2 ? Mg2 Index 37- 40 F4.2 --- db ? Distance of the corresponding point from the boundary line of NaD-Mg2 diagram (1) 42- 45 F4.2 0.1nm Mgb ? Mgb index 47- 50 F4.2 --- dc ? Distance of the corresponding point from the boundary line of NaD-Mgb diagram (1) 52- 55 F4.2 0.1nm CaMg ? CaMg index 57- 60 F4.2 --- dd ? Distance of the corresponding point from the boundary line of NaD-CaMg diagram (1)
Note (1): Subscripts a, b, c, and d correspond to (a), (b), (c), and (d) in Fig. 8, respectively.
Global notes: Note (G1): Dimensionless distance: d=[(D1/e1)2+(D2/e2)2]1/2 where D1, D2 and e1, e2 are the X and Y differences between the boundary line and the star position and the observational errors of the two indices in each diagram, respectively. See Sect. 4.1 for details.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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