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J/A+A/461/509 Membership and spectroscopy of IC 2391 (Platais+, 2007)
WIYN Open Cluster Study. XXVI. Improved kinematic membership and spectroscopy of IC 2391. Platais I., Melo C., Mermilliod J.-C., Kozhurina-Platais V., Fulbright J.P., Mendez R.A., Altmann M., Sperauskas J. <Astron. Astrophys. 461, 509 (2007)> =2007A&A...461..509P
ADC_Keywords: Clusters, open ; Abundances ; Photometry, CCD ; Proper motions ; Radial velocities Keywords: open clusters and associations: individual: IC 2391 - astrometry - stars: kinematics - stars: abundances Abstract: Young open clusters provide important clues to the interface between the main sequence and pre-main-sequence phases of stellar evolution. The young and nearby open cluster IC 2391 is well-suited to studies of these two evolutionary phases. We establish a bona fide set of cluster members and then analyze this set in terms of binary frequency, projected rotational velocities, [Fe/H], and lithium abundance. In the wake of the Hipparcos distance controversy for the Pleiades, we compare the main-sequence fitting distance modulus to the Hipparcos mean parallax for IC 2391. Description: A variety of new observational data are presented for probable members of the open cluster IC 2391. These include positions and proper motions, BV CCD photometry, iron abundances from FEROS spectra, and radial velocities obtained with Coravel and FEROS. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ic2391.dat 55 6991 Catalog of positions, relative proper motions and photographic V-photometry in the region of open cluster IC 2391 table1.dat 94 115 Astrometry & photometry for IC 2391 table3.dat 35 159 Coravel radial velocities table5.dat 52 82 High-resolution FEROS spectroscopic observations table6.dat 40 99 Iron line list and equivalent widths of objects 665, 1560, 3359 and 4362
See also: 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) Byte-by-byte Description of file: ic2391.dat
Bytes Format Units Label Explanations
2- 5 I4 --- Seq Object identifier 7- 8 I2 --- Nplates [1,12] Number of "plate pairs" (1) 10- 19 F10.6 deg RAdeg Right ascension for epoch J2000.0 and in the ICRS reference system (i.e., equinox J2000.0) 21- 30 F10.6 deg DEdeg Declination for the epoch J2000.0 and equinox J2000.0 32- 37 F6.1 mas/yr pmRA Relative proper motion in right ascension multiplied by cos(Dec) 39- 44 F6.1 mas/yr pmDE Relative proper motion in declination 46- 47 I2 % Prob Membership probability 49- 53 F5.2 mag Vmag Photographic V-magnitude 55 I1 --- Flag [0/1] flag indicating a possible image confusion if set equal to 1
Note (1): Because of multiple grating images and an offset exposures this number can be as high as 12.
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Object identifier 6- 11 I6 --- HD ? HD number 13- 15 A3 --- VXR Star number from Patten & Simon (1996ApJS..106..489P), VXR PSPC NNa in Simbad 17- 18 I2 h RAh Right ascension (J2000), epoch=J2000.0 20- 21 I2 min RAm Right ascension (J2000) 23- 27 F5.2 s RAs Right ascension (J2000) 29 A1 --- DE- Declination sign (J2000) 30- 31 I2 deg DEd Declination (J2000), epoch=J2000.0 33- 34 I2 arcmin DEm Declination (J2000) 36- 39 F4.1 arcsec DEs Declination (J2000) 41- 45 F5.1 mas/yr pmRA Proper motion in right ascension 47- 51 F5.1 mas/yr pmDE Proper motion in declination 53- 55 I3 % Prob Membership probability 59- 64 F6.3 mag Vmag V magnitude from CCD photometry 66- 71 F6.3 mag B-V B-V index from CCD photometry (1) 75- 80 F6.3 mag Jmag J magnitude from 2MASS catalog (1) 82- 87 F6.3 mag J-Ks J-Ks index from 2MASS catalog 89 A1 --- Memb [*] *: bona fide cluster member 91- 94 A4 --- Rem Remarks on binarity (2)
Note (1): Photometry with two decimal digits is from the literature Note (2): Remarks as follows: SB = single-lined spectroscopic binary SB1 = single-lined spectroscopic binary SB2 = double-lined spectroscopic binary SB1o = single-lined spectroscopic binary with orbital solution SB2o = double-lined spectroscopic binary with orbital solution SB: = suspected spectroscopic binary Bin? = suspected binarity from Hipparcos astrometry
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Object identifier 7 A1 --- m_Seq [AB] Component 9- 19 F11.3 d JD Julian date 23- 28 F6.2 km/s HRV Heliocentric radial velocity 31- 34 F4.2 km/s e_HRV Estimated standard error of radial velocity 35 A1 --- n_HRV [*] *: measurements obtained at the CASLEO2.2m telescope with the Lithuanian Coravel
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Object identifier 7- 9 I3 --- S/N Signal-to-noise ratio 11- 16 F6.3 mag B-V B-V index from CCD photometry (also in table1) 19- 30 F12.4 d JD Julian date 32- 37 F6.2 km/s HRV Heliocentric radial velocity 39 A1 --- l_vsini Limit flag on vsini 40- 44 F5.1 km/s vsini Projected rotation velocity 46- 48 A3 --- Bin [SB2 ] Binary type 50 A1 --- --- [(] 51 A1 --- m_Seq [AB] Component of spectroscopic binary 52 A1 --- --- [)]
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm lambda Wavelength 10- 14 A5 --- Ion Iron ion 17- 20 F4.2 eV EP Excitation potential 23- 24 I2 0.1pm Sun Equivalent width of the Sun (1) 26- 28 I3 0.1pm EW665 ? Equivalent width of star No. 665 30- 32 I3 0.1pm EW1560 ? Equivalent width of star No. 1560 34- 36 I3 0.1pm EW3359 ? Equivalent width of star No. 3359 38- 40 I3 0.1pm EW4362 ? Equivalent width of star No. 4362
Note (1): Solar equivalent widths taken from Fulbright et al. (2006ApJ...636..821F).
Acknowledgements: Imants Platais, imants(at)skysrv.pha.jhu.edu References: von Hippel & Sarajedini Paper I 1998AJ....116.1789V Sarajedidni et al. Paper II 1999AJ....118.2894S Sarajedidni Paper III 1999AJ....118.2321S Barrado y Navascues et al. Paper V 2001ApJ...549..452B Sills & Deliyannis Paper VI 2000ApJ...544..944S Platais et al, Paper VII 2001AJ....122.1486P Cat. J/AJ/122/1486 Platais et al. Paper VIII 2002AJ....124..601P Cat. J/AJ/124/601 Grocholski & Sarajedini Paper X 2002AJ....123.1603G von Hippel et al. Paper XI 2002AJ....124.1555V Kafka & Honeycutt Paper XV 2003AJ....126..276K Grocholski & Sarajedini Paper XVI 2003MNRAS.345.1015G Platais et al. Paper XVII 2003AJ....126.2922P Cat. J/AJ/126/2922 Mathieu et al. Paper XVIII 2004ApJ...602L.121M Sarajedini et al. Paper XIX 2004AJ....127..991S Kafka et al. Paper XX 2004AJ....127.1622K
(End) Imants Platais [Johns Hopkins Univ.] Patricia Vannier [CDS] 09-Oct-2006
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