J/A+A/501/553 Equivalent widths of IC 2602 & IC 2391 stars (D'Orazi+, 2009)
Chemical composition of the young open clusters IC 2602 & IC 2391.
D'Orazi V., Randich S.
<Astron. Astrophys. 501, 553 (2009)>
=2009A&A...501..553D 2009A&A...501..553D
ADC_Keywords: Clusters, open ; Abundances
Keywords: stars: abundances -
open clusters and associations: individual: IC 2602, IC 2391
Abstract:
Galactic open clusters have been long recognized as one of the best
tools to investigate the chemical content of Galactic disk and its
time evolution. In the last decade, many efforts have been directed to
chemically characterize the old and intermediate age population;
surprisingly, the chemical content of the younger and close
counterpart remains largely undetermined.
In this paper we present the abundance analysis of a sample of 15 G/K
members of the young pre-main sequence clusters IC 2602 and IC 2391.
Along with IC 4665, these are the first pre-main sequence clusters for
which a detailed abundance determination has been carried out so far.
Description:
We analyzed high-resolution, high S/N spectra acquired with different
instruments (UVES and CASPEC at ESO, and the echelle spectrograph at
CTIO), using MOOG and equivalent width measurements. Along with
metallicity ([Fe/H]), we measured NaI, SiI, CaI, TiI and TiII, and NiI
abundances. Stars cooler than ∼5500 show lower CaI, TiI, and NaI than
warmer stars. By determining TiII abundances, we show that, at least
for Ti, this effect is due to NLTE and over-ionization.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 63 15 Sample stars
tableew.dat 111 91 Equivalent widths of sample stars
(tables 6 & 7 of the paper)
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See also:
J/A+AS/126/81 : IC 2602 VRI photometry (Foster+ 1997)
J/A+AS/126/357 : Members of IC 2391 (Rolleston+ 1997)
J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001)
J/ApJS/134/103 : Low-mass members of IC 2391 (Barrado y Navascues+, 2001)
J/MNRAS/355/959 : Proper motions of IC 2391 possible members (Dodd+, 2004)
J/A+A/430/287 : XMM observations of IC 2391 stars (Marino+, 2005)
J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Star name
8- 9 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
11- 12 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
14- 17 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
19 A1 --- DE- Simbad Sign of the Declination (J2000.0)
20- 21 I2 deg DEd Simbad Degree of Declination (J2000.0)
23- 24 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
26- 27 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
31- 35 F5.2 mag Bmag ? Simbad B band magnitude
37- 41 F5.2 mag Vmag Simbad V band magnitude
43- 44 A2 --- SpType Simbad MK spectral type
46- 63 A18 --- SName Simbad name
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Byte-by-byte Description of file: tableew.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 --- El Element
15- 20 F6.3 --- loggf Oscillator strengths
22- 26 F5.1 0.1nm EW0 Sun equivalent width
28- 32 F5.1 0.1nm EW1 ?=99.9 R1 ([RSP95] 1) equivalent width
34- 38 F5.1 0.1nm EW2 ?=99.9 R14 ([RSP95] 14) equivalent width
40- 44 F5.1 0.1nm EW3 ?=99.9 R15 ([RSP95] 15) equivalent width
46- 50 F5.1 0.1nm EW4 ?=99.9 R66 ([RSP95] 66) equivalent width
52- 56 F5.1 0.1nm EW5 ?=99.9 R70 ([RSP95] 70) equivalent width
58- 61 F4.1 0.1nm EW6 ?=99.9 R92 ([RSP95] 92) equivalent width
63- 67 F5.1 0.1nm EW7 ?=99.9 R95 ([RSP95] 95) equivalent width
69- 73 F5.1 0.1nm EW8 ?=99.9 W79 (Cl* IC 2602 W 79) equivalent width
75- 78 F4.1 0.1nm EW9 ?=99.9 VXR3 (VXR PSPC 3) equivalent width
80- 83 F4.1 0.1nm EW10 ?=99.9 VXR31 (VXR PSPC 31) equivalent width
85- 89 F5.1 0.1nm EW11 ?=99.9 VXR67 (VXR PSPC 67) equivalent width
91- 94 F4.1 0.1nm EW12 ?=99.9 VXR70 (VXR PSPC 70) equivalent width
96-100 F5.1 0.1nm EW13 ?=99.9 VXR72 (VXR PSPC 72) equivalent width
102-106 F5.1 0.1nm EW14 ?=99.9 VXR76a (VXR PSPC 76a) equivalent width
108-111 F4.1 0.1nm EW15 ?=99.9 SHJM2 (Cl* IC 2391 SHJM 2) equivalent width
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Acknowledgements:
V. D'Orazi, vdorazi(at)arcetri.astro.it
(End) Patricia Vannier [DS] 18-May-2009