J/MNRAS/431/1005 IC 2391 and Argus young stars (de Silva+, 2013) ================================================================================ Search for associations containing young stars: chemical tagging IC 2391 and the Argus association. de Silva G.M., D'Orazi V., Melo C., Torres C.A.O., Gieles M., Quast G.R., Sterzik M. =2013MNRAS.431.1005D ================================================================================ ADC_Keywords: Associations, stellar ; YSOs ; Abundances Keywords: stars: abundances - open clusters and associations: general - open clusters and associations: individual: IC 2391 and Argus association Abstract: We explore the possible connection between the open cluster IC 2391 and the unbound Argus association identified by the search for associations containing young stars survey. In addition to common kinematics and ages between these two systems, here we explore their chemical abundance patterns to confirm if the two substructures shared a common origin. We carry out a homogeneous high-resolution elemental abundance study of eight confirmed members of IC 2391 as well as six members of the Argus association using UVES spectra. We derive spectroscopic stellar parameters and abundances for Fe, Na, Mg, Al, Si, Ca, Ti, Cr, Ni and Ba. All stars in the open cluster and Argus association were found to share similar abundances with the scatter well within the uncertainties, where [Fe/H]=-0.04+/-0.03 for cluster stars and [Fe/H]=-0.06+/-0.05 for Argus stars. Effects of overionization/excitation were seen for stars cooler than roughly 5200K as previously noted in the literature. Also, enhanced Ba abundances of around 0.6dex were observed in both systems. The common ages, kinematics and chemical abundances strongly support the fact that the Argus association stars originated from the open cluster IC 2391. Simple modelling of this system finds this dissolution to be consistent with two-body interactions. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 167 32 Revised list of high-probability members for the Argus association table2.dat 135 33 Revised list of high-probability members proposed for the open cluster IC 2391 table4.dat 188 16 Stellar parameters and abundances tablea1.dat 36 287 Atomic Line list -------------------------------------------------------------------------------- See also: J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001) J/A+A/461/509 : Membership and spectroscopy of IC 2391 (PPM) (Platais+, 2007) J/A+A/531/A143 : Rotational velocities of HR stars (Diaz+, 2011) J/AcA/62/67 : ASAS photometry of ROSAT sources (Kiraga, 2012) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 A1 --- N [*+] New member or more data (G1) 3- 17 A15 --- Name Name 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 28 F4.1 s RAs Right ascension (J2000) 30 A1 --- DE- Declination sign (J2000) 31- 32 I2 deg DEd Declination (J2000) 34- 35 I2 arcmin DEm Declination (J2000) 37- 38 I2 arcsec DEs Declination (J2000) 40- 45 F6.1 mas/yr pmRA Proper motion along RA 46 A1 --- n_pmRA [i] i: proper motion from literature (2) 48- 53 F6.1 mas/yr pmDE Proper motion along DE 54 A1 --- n_pmDE [i] i: proper motion from literature (2) 56- 60 F5.1 km/s RV Radial velocity 61 A1 --- n_RV [i] i: RV from literature (2) 63- 67 F5.1 km/s vsini ? Rotational velocity 68 A1 --- n_vsini [i] i: vsini from literature (2) 70- 77 F8.6 d Per ? Photometric period 78 A1 --- n_Per [i] i: Per from literature (2) 80- 84 F5.2 mag Vmag Johnson V magnitude 85 A1 --- n_Vmag [i] i: photometry from literature (2) 87- 90 F4.2 mag V-Ic ? Johnson-Cousins V-Ic colour index 91 A1 --- n_V-Ic [i] i: photometry from literature (2) 93- 98 A6 --- SpT MK spectral type 99 A1 --- n_SpT [i] i: SpT from literature (2) 101-103 I3 0.1nm EWLi ? Li equivalent width 104 A1 --- n_EWLi [i] i: EWLi from literature (2) 106-110 F5.1 mas plx Kinematical parallax 111 A1 --- n_plx [i] i: plx from literature (2) 113-117 F5.1 km/s U Heliocentric velocity towards Gal. center 119-123 F5.1 km/s V Heliocentric velocity towards Gal. rotation 125-128 F4.1 km/s W Heliocentric velocity towards N. Gal. Pole 130-134 F5.1 pc X Heliocentric distance towards Gal. center 136-141 F6.1 pc Y Heliocentric distance towards Gal. rotation 143-147 F5.1 pc Z Heliocentric distance towards N. Gal. Pole 149-152 F4.2 d Mmb [0/1] Membership probability 154-161 A8 --- Ref References (3) 163-167 A5 --- Notes Notes -------------------------------------------------------------------------------- Note (2): i indicates data from the literature with the reference in Ref file. Note (3): References as follows: H = data from Hipparcos, Cat. I/239 T = data from TYCHO, Cat. I/239 K = data from Kiraga (2012, J/AcA/62/67) 1 = Riedel et al. (2011AJ....142..104R) 2 = Desidera et al. (2011A&A...529A..54D) 3 = SB1, Porb = 613.9d, Guenther et al. (2007A&A...467.1147G) 4 = Covino et al. (1997A&A...328..187C) 5 = Brown dwarf at 6.7 arcsec Huelamo et al. (2010A&A...521L..54H) 6 = Zuckerman et al. (2011ApJ...732...61Z) 7 = Diaz et al. (2011, Cat. J/A+A/531/A143) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 A1 --- N [*+] New member or more data (G1) 3- 5 A3 --- --- [PMM] 7- 10 I4 --- PMM Identification in Platais et al. 2007, Cat. J/A+A/461/509, in Simbad 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 21 F4.1 s RAs Right ascension (J2000) 23 A1 --- DE- Declination sign (J2000) 24- 25 I2 deg DEd Declination (J2000) 27- 28 I2 arcmin DEm Declination (J2000) 30- 31 I2 arcsec DEs Declination (J2000) 33- 37 F5.1 mas/yr pmRA Proper motion along RA 38 A1 --- r_pmRA [PU] U: from UCAC4 (I/322), P: from Platais et al. (2007, J/A+A/461/509) 40- 43 F4.1 mas/yr pmDE Proper motion along DE 44 A1 --- r_pmDE [PU] U: from UCAC4 (I/322), P: from Platais et al. (2007, J/A+A/461/509) 46- 49 F4.1 km/s RV Radial velocity 51- 54 F4.1 km/s vsini ? Rotational velocity 56- 60 F5.3 d Per ? Photometric period 61 A1 --- n_Per [i] i: Per from literature (2) 63- 67 F5.2 mag Vmag Johnson V magnitude 68 A1 --- n_Vmag [i] i: photometry from literature (2) 70- 73 F4.2 mag CI ? Johnson B-V color index, or V-Ic (see n_B-V) 74 A1 --- n_CI [*] *: V-Ic color index in CI 76- 80 A5 --- SpT MK spectral type 81 A1 --- n_SpT [i] i: SpT from literature (2) 83- 85 I3 0.1nm EWLi ? Li equivalent width 87- 89 F3.1 mas plx Kinematical parallax 91- 95 F5.1 km/s U Heliocentric velocity towards Gal. center 97-101 F5.1 km/s V Heliocentric velocity towards Gal. rotation 103-106 F4.1 km/s W Heliocentric velocity towards N. Gal. Pole 108-111 F4.1 pc X Heliocentric distance towards Gal. center 113-118 F6.1 pc Y Heliocentric distance towards Gal. rotation 120-124 F5.1 pc Z Heliocentric distance towards N. Gal. Pole 126-129 F4.2 d Mmb [0/1] Membership probability 131-135 A5 --- Ref References (3) -------------------------------------------------------------------------------- Note (2): Data mainly from Platais et al. (2007, Cat. J/A+A/461/509); other are indicated by 'i' with the reference in Ref column. Note (3): References as follows: K = data from Kiraga (2012, Cat. J/AcA/62/67) 1 = Desidera et al. (2011A&A...529A..54D) 2 = Patten & Simon (1996ApJS..106..489P) 3 = SB2, Porb=90.617d, Platais et al. (2007, Cat. J/A+A/461/509) 4 = Randich et al. (2001, Cat. J/A+A/372/862) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 ---- Field Field (IC 2391 or ARGUS) 9- 23 A15 --- Name Star name (1) 25- 28 F4.1 km/s RV ? Radial velocity 30- 34 F5.2 km/s Vsini ? Rotational velocity 36- 39 I4 K Teff ? Effective temperature 41- 43 F3.1 [cm/s2] logg ? Surface gravity 45- 47 F3.1 km/s vturb ? Microturbulent velocity {xi} 49- 53 F5.2 [Sun] [FeI/H] Abundance [FeI/H] 55- 58 F4.2 [Sun] e_[FeI/H] rms uncertainty on [FeI/H] 60- 64 F5.2 [Sun] [FeII/H] ?=- Abundance [FeII/H] 66- 69 F4.2 [Sun] e_[FeII/H] ? rms uncertainty on [FeII/H] 71- 75 F5.2 [Sun] [Na/Fe] Abundance [Na/Fe] 77- 80 F4.2 [Sun] e_[Na/Fe] rms uncertainty on [Na/Fe] 82- 86 F5.2 [Sun] [Mg/Fe] Abundance [Mg/Fe] 88- 91 F4.2 [Sun] e_[Mg/Fe] rms uncertainty on [Mg/Fe] 93- 97 F5.2 [Sun] [Al/Fe] ?=- Abundance [Al/Fe] 99-102 F4.2 [Sun] e_[Al/Fe] ? rms uncertainty on [Al/Fe] 104-108 F5.2 [Sun] [Si/Fe] Abundance [Si/Fe] 110-113 F4.2 [Sun] e_[Si/Fe] rms uncertainty on [Si/Fe] 115-119 F5.2 [Sun] [Ca/Fe] Abundance [Ca/Fe] 121-124 F4.2 [Sun] e_[Ca/Fe] rms uncertainty on [Ca/Fe] 126-130 F5.2 [Sun] [TiI/Fe] Abundance [TiI/Fe] 132-135 F4.2 [Sun] e_[TiI/Fe] rms uncertainty on [TiI/Fe] 137-141 F5.2 [Sun] [TiII/Fe] Abundance [TiII/Fe] 143-146 F4.2 [Sun] e_[TiII/Fe] rms uncertainty on [TiII/Fe] 148-152 F5.2 [Sun] [CrI/Fe] Abundance [CrI/Fe] 154-157 F4.2 [Sun] e_[CrI/Fe] rms uncertainty on [CrI/Fe] 159-162 F4.2 [Sun] [CrII/Fe] Abundance [CrII/Fe] 164-167 F4.2 [Sun] e_[CrII/Fe] rms uncertainty on [CrII/Fe] 169-173 F5.2 [Sun] [Ni/Fe] Abundance [Ni/Fe] 175-178 F4.2 [Sun] e_[Ni/Fe] rms uncertainty on [Ni/Fe] 180-183 F4.2 [Sun] [BaII/Fe] Abundance [BaII/Fe] 185-188 F4.2 [Sun] e_[BaII/Fe] rms uncertainty on [BaII/Fe] -------------------------------------------------------------------------------- Note (1): Avg for Average values of the Field. see Section 3.4 for details on the computation of the average values. -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- El Element and ionisation stage 6- 8 I3 --- A [134/138]? Isotope (for Ba) 10- 17 F8.3 0.1nm lambda Wavelength {lambda} 19- 23 F5.3 eV EP Energy potential 25- 30 F6.3 [-] loggf Oscillator strength 32- 36 F5.1 0.1pm EW ? Equivalent width for PMM3359 -------------------------------------------------------------------------------- Global notes: Note (G1): Notes as follows: * = new inclusions previously not listed by Torres et al. (2008, Young Nearby Loose Associations. Reipurth B., editor. 2008. p. 757). + = data in table4.dat -------------------------------------------------------------------------------- History: * 17-Feb-2014: From electronic version of the journal * 22-May-2014: Position of PMM 8415 in table2 corrected ================================================================================ (End) Patricia Vannier [CDS] 17-Jan-2014