J/AJ/155/138 WOCS.LXXVI.Velocity & abundances in NGC2506 (Anthony-Twarog+, 2018)
WIYN open cluster study.
LXXVI. Li evolution among stars of low/intermediate mass: the metal-deficient
open cluster NGC 2506.
Anthony-Twarog B.J., Lee-Brown D.B., Deliyannis C.P., Twarog B.A.
<Astron. J., 155, 138 (2018)>
=2018AJ....155..138A 2018AJ....155..138A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, double and multiple ; Stars, giant ;
Radial velocities ; Photometry, UBV ; Abundances ;
Effective temperatures ; Equivalent widths
Keywords: open clusters and associations: individual (NGC 2506) -
stars: abundances - stars: evolution
Abstract:
HYDRA spectra of 287 stars in the field of NGC 2506 from the turnoff
through the giant branch are analyzed. With previous data, 22 are
identified as probable binaries; 90 more are classified as potential
non-members. Spectroscopic analyses of ∼60 red giants and slowly rotating
turnoff stars using line equivalent widths and a neural network approach
lead to [Fe/H]=-0.27±0.07 (s.d.) and [Fe/H]=-0.27±0.06 (s.d.),
respectively. Li abundances are derived for 145 probable single-star
members, 44 being upper limits. Among turnoff stars outside the Li-dip,
A(Li)=3.04±0.16 (s.d.), with no trend with color, luminosity, or
rotation speed. Evolving from the turnoff across the subgiant branch,
there is a well-delineated decline to A(Li)∼1.25 at the giant branch
base, coupled with the rotational spindown from between ∼20 and 70 km/s
to less than 20 km/s for stars entering the subgiant branch and beyond.
A(Li) remains effectively constant from the giant branch base to the red
giant clump level. A new member above the clump redefines the path of
the first-ascent red giant branch; its Li is 0.6 dex below the first-ascent
red giants. With one exception, all post-He-flash stars have upper limits
to A(Li), at or below the level of the brightest first-ascent red giant.
The patterns are in excellent qualitative agreement with the model
predictions for low/intermediate-mass stars which undergo rotation-induced
mixing at the turnoff and subgiant branch, first dredge-up, and
thermohaline mixing beyond the red giant bump.
Description:
Spectroscopic data were obtained using the WIYN 3.5 m telescope and
the HYDRA multi-object spectrograph over 19 nights from 2015 January 16/17
to 2017 February 24/25. In these 58 hr of observing over a 25 month period,
we obtained spectra with signal-to-noise per pixel ≥100 for all 287 stars.
Our spectra cover a wavelength range ∼400 Å wide centered on 6650 Å
with per-pixel resolution of 0.2 Å and a resolution of R∼13000.
We used the SPLOT utility within IRAF to measure EWs and Gaussian
full-widths of the Li 6707.8 Å line for all 287 stars. A reasonably
close and relatively line-free region between 6680 Å and 6690 Å was
examined to estimate the S/N per pixel, also estimated using SPLOT.
Objects:
------------------------------------------------------
RA (ICRS) DE Designation(s)
------------------------------------------------------
08 00 01 -10 46.2 NGC 2506 = Cl Melotte 80
------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 70 287 Velocity and membership information for
spectroscopic sample in NGC 2506
table3.dat 67 68 Abundances for NGC 2506 stars
table4.dat 36 145 Lithium abundances for NGC 2506 stars
--------------------------------------------------------------------------------
See also:
J/A+AS/113/299 : Abundances and velocities for cluster giants (Minniti 1995)
J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001)
J/A+A/382/899 : BVI photometry in M67 (Stassun+, 2002)
J/AJ/124/601 : Absolute positions and proper motions in NGC 188
(Platais+, 2002)
J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003)
J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007)
J/A+A/484/609 : BVI photometry and proper motions in M67 (Yadav+, 2008)
J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)
J/MNRAS/391/1482 : BVIc photometry of Trumpler 20 (Platais+, 2008)
J/AJ/137/3743 : Spectroscopic binary orbits in NGC 188 (Geller+, 2009)
J/AJ/137/5086 : NGC 188 V12 VI light curves (Meibom+, 2009)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry
(Hole+, 2009)
J/ApJ/695/679 : Stellar rotation in M35 (Meibom+, 2009)
J/A+A/515/A100 : VI light curves of NGC 1039 solar-type stars (James+, 2010)
J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)
J/AJ/139/2034 : NGC 6253 stars equivalent widths (Anthony-Twarog+, 2010)
J/ApJ/733/115 : Rotation periods and membership in M34 (Meibom+, 2011)
J/MNRAS/413/1024 : Deep proper-motion survey of Blanco 1 (Platais+, 2011)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
J/AJ/147/138 : Rotational and radial velocities of red giants
(Carlberg, 2014)
J/AJ/148/38 : WIYN open cluster study. LX. RV survey of NGC 6819
(Milliman+, 2014)
J/AJ/148/51 : WIYN Open Cluster. LXI. NGC 6819 photometry
(Anthony-Twarog+, 2014)
J/AJ/148/61 : WIYN open cluster study. LIX. RVs of NGC 6791
(Tofflemire+, 2014)
J/AJ/148/85 : WIYN open cluster study. LXII. Photometry of M35
(Thompson+, 2014)
J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015)
J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015)
J/AJ/150/97 : Radial velocities in M67. I. 1278 candidate members
(Geller+, 2015)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
J/AJ/151/152 : WOCS. LXXI. Spectroscopy of 5 stars in NGC 6791
(Milliman+, 2016)
J/AJ/152/192 : WOCS. LXXII. A uvbyCaHb study of NGC 2506
(Anthony-Twarog+, 2016)
J/AJ/153/128 : WOCS. LXXV. Hyades+Praesepe stellar lithium data
(Cummings+, 2017)
http://webda.physics.muni.cz/ : WEBDA database
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- WEBDA [1106/7135] WEBDA identification number (G1)
6- 15 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
17- 26 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1)
28- 31 F4.2 --- Prob [0/0.95]? Membership probability
(Chiu & Van Altena 1981ApJ...243..827C 1981ApJ...243..827C)
33- 37 F5.1 km/s HRV [-45.9/136] Heliocentric radial velocity
39- 42 F4.1 km/s e_HRV [0.1/19.7] Uncertainty in HRV
44- 48 F5.1 km/s vsini [7/110.2] Rotational velocity
50- 53 F4.1 km/s e_vsini [0.1/10.9] Uncertainty in vsini
55- 59 F5.3 mag B-V [0.196/1.756] B-V color index
61- 66 F6.3 mag Vmag [11.252/15.584] V band magnitude
68- 70 A3 --- Class Membership classification (2)
--------------------------------------------------------------------------------
Note (1): Table 1 lists stars in sequence based upon their Right Ascension;
coordinates given in Table 1 are identical to those found in
Anthony-Twarog et al. (2016, J/AJ/152/192) for all but 10 stars not included
in the photometric study.
Note (2): Membership classification defined as follows:
M = Probable radial-velocity member;
NM = Nonmember;
MB = Probable binary member;
MN = Radial-velocity member with proper-motion membership below 50%;
B = Probable binary for which the radial velocity deviates significantly
from the mean;
BNM = Binary with deviant radial velocity but proper-motion probability
below 50%;
BM = Binary with deviant radial velocity but proper-motion probability
above 50%.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- WEBDA [1108/7128] WEBDA identification number (G1)
6- 9 I4 K Teff-NN [4546/5768]? Effective temperature derived
with ANNA code
11- 15 F5.2 [Sun] [Fe/H]-NN [-0.48/0.34]? Metallicity derived with ANNA
code
17- 21 F5.2 [Sun] [Fe/H]-RS [-0.55/0.24] Median metallicity derived with
ROBOSPECT code
23- 26 F4.2 --- MAD [0.01/0.29] Median absolute deviation for
Fe abundance
28- 29 I2 --- NFe [5/17] Number of Fe lines measured
31- 35 F5.2 [Sun] [Ca/H] [-0.54/0.28]? Ca abundance derived with
ROBOSPECT code
37- 41 F5.2 [Sun] [Si/H] [-1.14/0.28] Si abundance derived with
ROBOSPECT code
43- 47 F5.2 [Sun] [Ni/H] [-0.85/0.31] Ni abundance derived with
ROBOSPECT code
49- 52 F4.2 [Sun] e_[Ni/H] [0.01/0.19] Uncertainty in [Ni/H]
54- 57 I4 K Teff-ph [4504/7079] Photometric effective
temperature
59- 62 F4.2 [cm/s2] logg [1.9/3.7] Surface gravity
64- 67 F4.2 km/s xi [1.31/2.3] Microturbulent velocity
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- WEBDA [1108/7132] WEBDA identification number (G1)
6- 9 I4 K Teff [4505/7600] Effective temperature
11- 14 F4.1 0.1nm EW(Li) [5/84.4] Equivalent width of Li 6707.8Å (Å)
16- 18 I3 --- S/N [89/261] Spectra signal-to-noise ratio per pixel
at 6680-6690Å
20- 23 F4.2 0.1nm FWHM [0.46/3.82] Gaussian full-width at half maximum
of the Li 6707.8Å line
25 A1 --- l_A(Li) [<] Limit flag on A(Li)
26- 29 F4.2 [Sun] A(Li) [0.2/3.34] Lithium abundance
31- 34 F4.2 [Sun] e_A(Li) [0.03/0.14]? Uncertainty in A(Li)
36 I1 --- f_A(Li) [1/3]? Flag on A(Li) (1)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
1 = Lithium abundance upper limit constrained by S/N;
2 = Lithium abundance upper limit constrained by the temperature grid;
3 = Lithium abundance upper limit constrained by S/N and the temperature grid.
--------------------------------------------------------------------------------
Global notes:
Note (G1): Whenever available, a star is referred to using its WEBDA
identification. For stars outside the area listed within WEBDA, the numbers
greater than 7000 refer to stars added by this survey. A point of confusion
regarding the WEBDA identifications does require correction. In the original
photometric and astrometric surveys (McClure et al. 1981ApJ...243..841M 1981ApJ...243..841M;
Chiu & van Altena 1981ApJ...243..827C 1981ApJ...243..827C), the stars were numbered using a
quadrant number, ring number, and sequential count within that zone. For
quadrant 2, ring 3, the number of stars extended to 106, so the last star
measured was 23106. WEBDA incorrectly rewrote the numbers above 100 as ring 4,
i.e. 23106 became 2406. This leads to confusion because in quadrants 2 and 4,
there are photoelectric standards outside the three rings of the photographic
survey numbered 2401, 2402, 4401, and 4402. WEBDA 2401 and 2402 are actually
23101 and 23102. In this Table and analysis, 2401 and 2402 refer to the
original designations as marked on the cluster chart (Fig. 1) of
McClure et al. (1981ApJ...243..841M 1981ApJ...243..841M).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
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(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 14-Nov-2018