J/AJ/163/278 Stellar populations in IC 2602 and IC 2391 (Nisak+, 2022)
Mapping out the Stellar Populations of IC 2602 and IC 2391.
Nisak A.H., White R.J., Yep A., Henry T.J., Paredes L., James H.-S.,
Jao W.-C.
<Astron. J., 163, 278 (2022)>
=2022AJ....163..278N 2022AJ....163..278N
ADC_Keywords: Clusters, open; Spectra, optical; Parallaxes, trigonometric;
Proper motions; Abundances, [Fe/H]; Effective temperatures
Keywords: Open star clusters ; Young star clusters
Abstract:
IC2391 and IC2602 are important benchmarks for testing early star and
planet evolution theories, both structural and dynamical, because they
are the nearest open clusters with ages of ∼50Myr. We refine
membership lists for these clusters by identifying candidate members
using Gaia DR2 kinematic and distance information. We identify 451
candidate members of IC2602 and 350 candidate members of IC2391. If
confirmed, this would increase the known populations of these clusters
by 275% and 130%, respectively. We use CHIRON on the CTIO/SMARTS 1.5m
telescope via fiber mode which yields a resolution of 27400 to acquire
high-resolution spectra of 26 new candidate cluster members brighter
than G=13 magnitude, as well as an additional 12 previously known
members. Measures of lithium, Hα, stellar properties (Teff,
logg, [Fe/H]), radial velocities, and vsini values from these spectra
are used to confirm cluster membership. We find that 37 of 38 stars we
observe are bona fide cluster members, of which four are new candidate
photometric binaries and 10 are new candidate spectroscopic binaries.
Description:
We obtain spectra for all 26 bright (G<13) candidate members newly
identified in this study to confirm cluster membership. We also
observe 12 previously known (also with G<13) cluster members to check
the reliability of our analysis techniques. We obtain single-epoch
1200s exposures for each star using the CHIRON echelle spectrograph on
the Cerro Tololo Inter-American Observatory Small and Moderate
Aperture Research Telescope System CTIO/SMARTS 1.5m telescope. The
stars are observed in fiber mode, which covers 4500-8900Å over 62
spectral orders at a resolving power of R∼27400.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
08 41 10 -52 59.5 IC 2391 = IC 2391
10 42 27 -64 25.6 IC 2602 = IC 2602
-----------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 109 26 Measurements for 26 new candidate members of
IC 2602 and IC 2391
table4.dat 122 12 Measurements for 12 known members of IC 2602 and
IC 2391
tablea1.dat 160 350 Refined membership list of IC 2391
tablea2.dat 160 451 Refined membership List of IC 2602
--------------------------------------------------------------------------------
See also:
B/simbad : Simbad objects catalogue (M.Wenger 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
J/A+AS/126/81 : IC 2602 VRI photometry (Foster+ 1997)
J/A+AS/126/357 : Members of IC 2391 (Rolleston+ 1997)
J/ApJS/134/103 : Low-mass members of IC 2391 (Barrado y Navascues+, 2001)
J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001)
J/A+A/410/671 : X-ray emission in cool main sequence stars (Messina+, 2003)
J/MNRAS/355/959 : Proper motions of IC 2391 possible members (Dodd+, 2004)
J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007)
J/AJ/133/2524 : Spectra of young nearby stars (White+, 2007)
J/ApJ/706/1484 : Photometry and spectroscopy in IC 2391 (Boudreault+, 2009)
J/A+A/501/553 : Equivalent widths of IC 2602 & IC 2391 stars (D'Orazi+, 2009)
J/A+A/498/949 : Velocities of 1253 F-K dwarfs in clusters (Mermilliod+, 2009)
J/MNRAS/399/2146 : Orbits of open clusters in the Galaxy (Wu+, 2009)
J/MNRAS/431/1005 : IC 2391 and Argus young stars (de Silva+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/AJ/147/69 : Radial velocities in Be 44, Be 81, and NGC 6802 (Hayes+, 2014)
J/MNRAS/458/4530 : Chandra Galactic Bulge Survey (Wevers+, 2016)
J/AJ/153/128 : WOCS. LXXV. Hyades&Praesepe stellar Li data (Cummings+, 2017)
J/A+A/608/A95 : GES; multi-line spectroscopic binary candidates (Merle+, 2017)
J/A+A/601/A70 : GES; pre-main-sequence clusters [Fe/H] (Spina+, 2017)
J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+, 2017)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/A+A/616/A10 : 46 open cluster GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/A+A/612/A99 : Gaia-ESO Survey in 7 open star cluster fields (Randich+, 2018)
J/AJ/157/85 : The CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)
J/AJ/158/163 : Li abundance values for stars in NGC 6819 (Deliyannis+, 2019)
J/AJ/158/54 : New Taurus members stellar to planetary masses (Esplin+, 2019)
J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)
J/A+A/643/A71 : Members for 20 open clusters (Gutierrez Albarran+, 2020)
J/AJ/160/44 : Upper Scorpius spectroscopy and photometry (Luhman+, 2020)
J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Cluster Cluster identifier
9- 14 A6 --- ID Internal identifier
16- 19 A4 --- f_ID l Flag on ID (G1)
21- 36 A16 --- 2MASS 2MASS identifier
38- 43 F6.2 km/s RVel [-26.7/56] Radial velocity from CHIRON
45- 48 F4.2 km/s e_RVel [0.09/0.3] Error on RVel
50- 53 F4.1 km/s vsini [4.6/27.2] Rotational velocity from CHIRON
55- 57 F3.1 km/s e_vsini [0.7/6.6] Error on vsini
59 A1 --- l_EW-Li [<] Limit flag on EW-Li
60- 63 F4.2 0.1nm EW-Li [0.01/0.35] CHIRON Equivalent Width for Li-line
(Å)
65- 68 F4.2 0.1nm e_EW-Li [0.01/0.03] Error on EW-Li
70- 74 F5.2 0.1nm EW-Ha [-1.3/0.93] CHIRON Equivalent Width for
Hα-line (Å)
76- 79 F4.2 0.1nm e_EW-Ha [0.01/0.05] Error on EW-Ha
81- 84 I4 K Teff [3257/6465] Effective temperature from SpecMatch
86- 88 I3 K e_Teff [70/110] Error on Teff
90- 93 F4.2 [-] logg [3.86/4.86] Surface gravity from SpecMatch
95- 98 F4.2 [-] e_logg [0.12] Error on logg
100-104 F5.2 [-] Fe/H [-0.53/0.19] Metallicity from SpecMatch
106-109 F4.2 [-] e_Fe/H [0.09] Error on Fe/H
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Cluster Cluster identifier
9- 15 A7 --- ID Internal identifier
17- 20 A4 --- f_ID Flag on ID (G1)
22- 26 F5.2 km/s RVel [13.8/39.9] Radial velocity
28- 31 F4.2 km/s e_RVel [0.1/0.2] Error on RVel
33- 37 F5.2 km/s RVel-l [13.8/31.7] Radial velocity from Litterature
39- 42 A4 --- r_RVel-l Reference used for RVel-l (1)
44- 47 F4.1 km/s vsini [7.8/20.8] Rotational velocity
49- 51 F3.1 km/s e_vsini [0.6/2] Error on vsini
53 A1 --- l-vsini-l [<] Limit flag on vsini-l
54- 57 F4.1 km/s vsini-l [8/20.7] Rotational velocity from litterature
59- 62 A4 --- r_vsini-l Reference used for vsini-l (1)
64- 67 F4.2 0.1nm EW-Li [0.07/0.36] Equivalent Width for Li-line (Å)
69- 72 F4.2 0.1nm e_EW-Li [0/0.02] Error on EW-Li
74- 78 F5.2 0.1nm EW-Ha [-0.12/0.91] Equivalent Width for Hα-line
(Å)
80- 83 F4.2 0.1nm e_EW-Ha [0.01/0.02] Error on EW-Ha
85- 88 I4 K Teff [4614/6150] Effective temperature
90- 92 I3 K e_Teff [110] Error on Teff
94- 97 I4 K Teff-l [4520/5900]? Effective temperature from
litterature
99-101 A3 --- r_Teff Reference used for Teff (1)
103-106 F4.2 [-] logg [4.09/4.6] Surface gravity
108-111 F4.2 [-] e_logg [0.12] Error on logg
113-117 F5.2 [-] Fe/H [-0.54/0.15] Metallicity
119-122 F4.2 [-] e_Fe/H [0.09] Error on Fe/H
--------------------------------------------------------------------------------
Note (1): References as follows:
D13 = De Silva+, 2013, J/MNRAS/431/1005
M09 = Marsden, 2009MNRAS.399..888M 2009MNRAS.399..888M
Me09 = Mermilliod+, 2009, J/A+A/498/949
Pl07 = Platais+, 2007, J/A+A/461/509
R01 = Randich+, 2001, J/A+A/372/862
R18 = Randich+, 2018, J/A+A/612/A99
S97 = Stauffer+, 1997ApJ...479..776S 1997ApJ...479..776S
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- GAIA Gaia DR2 identifier
21- 36 A16 --- 2MASS 2MASS identifier
38- 54 F17.13 deg RAdeg Right ascension (ICRS) at Ep=2015.5 (ra)
56- 72 F17.13 deg DEdeg Declination (ICRS) at Ep=2015.5 (dec)
74- 75 I2 h RAh Hour of Right Ascension
77- 78 I2 min RAm Minute of Right Ascension
80- 85 F6.3 s RAs Second of Right Ascension
87- 87 A1 --- DE- Sign of Declination
88- 89 I2 deg DEd Degree of Declination
91- 92 I2 arcmin DEm Arcminute of Declination
94- 99 F6.3 arcsec DEs Arcsecond of Declination
101-106 F6.4 mas plx Gaia DR2 parallax
108-113 F6.4 mas e_plx Mean error in plx
115-121 F7.3 mas/yr pmRA Gaia DR2 Proper motion in Right Ascension
123-127 F5.3 mas/yr e_pmRA Mean error in pmRA
129-134 F6.3 mas/yr pmDE Proper motion in Declination
136-140 F5.3 mas/yr e_pmDE Mean error in pmDE
142-150 F9.6 mag Gmag Gaia G apparent magnitude
152-160 F9.6 mag BP-RP ? Gaia BP-RP color
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Globale Notes:
Note (G1): Flags as follows:
a = Photometric
b = Single-lined spectroscopic
c = Double-lined spectroscopic. Stars flagged as candidate
double-lined spectroscopic binaries have biased equivalent widths and
SpecMatch properties so those measurements are suspect in the table
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 18-Oct-2022