J/AJ/159/220 WOCS LXXIX. M48. I. WIYN/Hydra spectra for M48 stars (Sun+, 2020)
WIYN open cluster study LXXIX. M48 (NGC 2548)
I. Radial velocities, rotational velocities, and metallicities of stars in the
open cluster M48 (NGC 2548).
Sun Q., Deliyannis C.P., Steinhauer A., Twarog B.A., Anthony-Twarog B.J.
<Astron. J., 159, 220 (2020)>
=2020AJ....159..220S 2020AJ....159..220S
ADC_Keywords: Clusters, open; Radial velocities; Spectra, optical; Abundances;
Photometry, UBV; Rotational velocities; Effective temperatures
Keywords: Metallicity ; Stellar abundances ; Open star clusters ;
Stellar effective temperatures ; Radial velocity
Abstract:
WIYN/Hydra spectra (R∼13500, signal-to-noise=50-1000/pixel) of a 400Å
region around Li 6708Å are used to determine radial and rotational
velocities for 287 photometrically selected candidate members of the
open cluster M48. The sample ranges from turnoff A stars to late-K
dwarfs and eight giants. We combine our radial velocity (VRAD)
measurements and power spectrum analysis with parallax and proper
motion data from Gaia DR2 to evaluate membership and multiplicity. We
classify 152 stars as single cluster members, 11 as binary members, 16
as members of uncertain multiplicity, 56 as single nonmembers, 28 as
single "likely" nonmembers, two as single "likely" members, one as a
binary "likely" member, five as binary nonmembers, 10 as "likely"
members of uncertain multiplicity, three as nonmembers of uncertain
multiplicity, and three as "likely" nonmembers of uncertain
multiplicity. From a subsample of 95 single members, we derive
VRAD=8.512±0.087km/s (σµ, and σ=0.848km/s).
Using 16 isolated Fe I lines for a subsample of 99 single members
(that have σTeff<75K (from 10 colors from UBVRI), vsini<25km/s,
and well-behaved Fe I lines), [Fe/H]M48=-0.063±0.007dex (σµ).
[Fe/H] is independent of Teff over an unprecedentedly large range of
2500K. The minimum cluster binary fraction is 11%-21%. M48 exhibits a
clear but modest broadening of the main-sequence turnoff, and there is
no correlation between color and vsini.
Description:
Observations of M48 candidate members were made using the
Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5m telescope and Hydra multi-fiber
spectrograph during four runs in 2017-October, 2017-December, 2018-March,
and 2018-April at Kitt Peak National Observatory (KPNO) in Southern
Arizona. The spectra span 6450-6850Å and have a dispersion of
0.205Å/pixel and a resolution of R∼13500.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 198 287 Parameters and metallicity for M48 stars
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+AS/53/181 : Star positions in 14 southern gal. clusters (Andersen+, 1983)
J/A+A/275/101 : Chemical evolution of the galactic disk I. (Edvardsson+ 1993)
J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993)
J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993)
J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997)
J/A+AS/146/251 : Open clusters absolute proper motions. I. (Baumgardt+, 2000)
J/A+A/381/464 : Proper motions and membership in NGC 2548 (Wu+, 2002)
J/AJ/127/2210 : u'g'r'i'z' photometry in NGC 2548 (M48) (Rider+, 2004)
J/A+A/437/457 : NGC2548 uvbyHβ and proper motions (Balaguer-Nunez+,2005)
J/MNRAS/364/272 : Elemental abundances in Blanco 1 (Ford+, 2005)
J/AJ/132/1669 : Wide-field CCD phot. around 9 open clusters (Sharma+, 2006)
J/PASP/118/1104 : M48 (NGC 2548) BATC photometry and membership (Wu+, 2006)
J/A+A/485/303 : Radial velocities for 1309 stars & 166 OCl (Mermilliod+,2008)
J/A+A/485/95 : Velocities of F-G-K stars in Blanco 1 (Mermilliod+, 2008)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
J/AJ/139/2034 : NGC 6253 stars equivalent widths (Anthony-Twarog+, 2010)
J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)
J/A+A/583/A73 : Color-period diagram for M48 (NGC2548) (Barnes+, 2015)
J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015)
J/MNRAS/461/2519 : NGC2548 clumpy spatial & kinematic data (Vicente+, 2016)
J/AJ/153/128 : WOCS. LXXV. Hyades&Praesepe stellar Li data (Cummings+, 2017)
J/AJ/156/37 : Photo.& Li abund. cool dwarfs in M35 (Anthony-Twarog+, 2018)
J/AJ/155/138 : WOCS.LXXVI. Velocity & abund. NGC2506 (Anthony-Twarog+, 2018)
J/AJ/155/183 : Properties of variables in the NGC 1846 field (Salinas+,2018)
J/AJ/158/163 : Li abundance values for stars in NGC 6819 (Deliyannis+, 2019)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Stellar identifier (1)
6 A1 --- n_ID Note on star #2015 (2)
8 I1 h RAh [8] Hour of Right Ascension (J2000)
10- 11 I2 min RAm [11/15] Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- [-] Sign of the Declination (J2000)
20 I1 deg DEd [5/6] Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 35 F6.3 mag Vmag [8.1/17.4] Apparent V band magnitude
37- 41 F5.3 mag B-V [0/10] The (B-V) color index
43- 48 F6.2 km/s RV1 [-30/137] First night measured radial velocity
50- 55 F6.2 km/s RV2 [-27/136]? Second night measured radial velocity
57- 62 F6.2 km/s RV3 [-17/136]? Third night measured radial velocity
64- 69 F6.2 km/s RV4 [6.7/112]? Fourth night measured radial velocity
71- 76 F6.2 km/s RV5 [8.5/113]? Fifth night measured radial velocity
78- 83 F6.2 km/s RV6 [7.8/112]? Sixth night measured radial velocity
85- 89 F5.2 km/s e_RV1 [0.46/42] Uncertainty in VRad1
91- 95 F5.2 km/s e_RV2 [0.35/16]? Uncertainty in VRad2
97-100 F4.2 km/s e_RV3 [0.42/2]? Uncertainty in VRad3
102-105 F4.2 km/s e_RV4 [0.71/2.3]? Uncertainty in VRad4
107-110 F4.2 km/s e_RV5 [0.33/0.62]? Uncertainty in VRad5
112-115 F4.2 km/s e_RV6 [0.35/0.82]? Uncertainty in VRad6
117-122 F6.2 km/s RV [-19/137]? Radial velocity from combined
spectra (3)
124-128 F5.2 km/s e_RV [0.32/17]? Uncertainty in VRad
130-134 F5.1 km/s vsini [6/300]? Rotational velocity
136-139 F4.1 km/s e_vsini [0.1/14]? Uncertainty in vsini
141-143 A3 --- Ha? ? Whether vsini measured using Hα (4)
145-149 F5.3 mag B-Veff [0.042/1.4]? Averaged B-V (5)
151-155 F5.3 mag e_B-Veff [0.002/0.078]? Uncertainty in B-Veff
157-160 I4 K Teff [4012/7484]? Effective temperature
162-166 F5.1 K e_Teff [4.8/156]? Uncertainty in Teff
168-171 F4.2 [cm/s2] logg [4.25/4.78]? log surface gravity
173-176 F4.2 km/s Vt [0.8/2.76]? Turbulent velocity
178-183 F6.3 [Sun] Z [-0.327/0.203]? Metallicity (6)
185-189 F5.3 [Sun] e_Z [0.014/0.127]? Uncertainty in Z
191-194 I4 --- S/N [51/1063]? Signal to noise of combined spectra
196-198 A3 --- Mem Binarity and membership determination code (7)
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Note (1): Table ordered by decreasing V band brightness.
Note (2):
a = Note that star 2015 has measured secondary star measurements from fxcor.
They are: RV6=45.16km/s; e_RV6=6.90km/s; vsini=31km/s; e_vsini=5.1km/s
Note (3): Measured by the combined spectra for single stars and stars
with uncertain multiplicity.
Note (4): Or by averaging lines between 6600 Angstroms and 6800 Angstroms.
Note (5): By using all 10 possible color combinations from UBVRI.
Note (6): For individual stars based on calculations in section 4.2, for
single-member stars that satisfy the vsini & e_Teff criteria only.
Note (7): Codes as follows:
sm = single member (152 occurrences);
bm = binary member (11 occurrences);
?m = member of uncertain multiplicity (16 occurrences);
sn = single star nonmember (56 occurrences);
sn? = single star likely non-member (28 occurrences);
sm? = single star likely member (2 occurrences);
bm? = binary likely member (1 occurrence);
bn = binary nonmember (5 occurrences);
?m? = likely member of uncertain multiplicity (10 occurrences);
?n = nonmember of uncertain multiplicity (2 occurrences);
?n? = likely nonmember of uncertain multiplicity (4 occurrences).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 05-Jun-2020