J/AJ/165/45 (H-W2)-W1 vs W2-(BP-K) for 4 open cluster members (Malofeeva+, 2023)
Unresolved Binaries and Multiples in the Intermediate Mass Range in Open
Clusters: Pleiades, Alpha Per, Praesepe, and NGC 1039.
Malofeeva A.A., Mikhnevich V.O., Carraro G., Seleznev A.F.
<Astron. J., 165, 45 (2023)>
=2023AJ....165...45M 2023AJ....165...45M
ADC_Keywords: Clusters, open; Stars, double and multiple; Photometry, infrared;
Optical
Keywords: Open star clusters ; Binary stars ; Multiple stars
Abstract:
In this study, we continue our project to search for unresolved binary
and multiple systems in open clusters exploiting the photometric
diagram (H-W2)-W1 versus W2-(BP-K) first introduced in Malofeeva+,. In
particular, here we estimate the binary and multiple star ratios and
the distribution of the component mass ratio q in the Galactic
clusters AlphaPersei, Praesepe, and NGC1039. We have modified the
procedure outlined in our first study making star counts automatic and
by introducing bootstrapping for error estimation. Basing on this, we
reinvestigated the Pleiades star cluster in the same mass range as in
our previous work and corrected an inaccuracy in the mass ratio q
distribution. The binary and multiple star ratio in the four clusters
is then found to lie between 0.45±0.03 and 0.73±0.03. On the
other hand, the ratio of systems with multiplicity more than 2 is
between 0.06±0.01 and 0.09±0.02. The distribution of the
component mass ratio q is well fitted with a Gaussian having the mode
between 0.22±0.04 and 0.52±0.01 and the dispersion between
0.10±0.02 and 0.35±0.07. All clusters show a large number of
the very low-mass secondary components in the binary systems with
primary components below 0.5M☉.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
03 46 24.24 +24 06 50.4 Pleiades = C 0344+239
03 24 19.37 +49 51 40.2 Alpha Per = * alf Per
08 40 12.96 +19 37 15.5 Praesepe = C 0837+201
02 42 07.44 +42 43 19.2 NGC1039 = C 0238+425
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fig3.dat 86 1285 The (H-W2)-W1 vs W2-(BP-K) diagram for Pleaides
probable members
fig5.dat 86 913 The (H-W2)-W1 vs W2-(BP-K) diagram for the probable
members of Alpha Persei
fig6.dat 86 1233 The (H-W2)-W1 vs W2-(BP-K) diagram for the probable
members of Praesepe
fig9.dat 86 553 The diagram (H-W2)-W1 vs W2-(BP-K) for the probable
members of NGC 1039
--------------------------------------------------------------------------------
See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/123/1570 : alpha Persei and Praesepe Clusters (Patience+, 2002)
J/MNRAS/385/2210 : Spectroscopy around lam Ori and sig Ori (Maxted+, 2008)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/MNRAS/434/3236 : Masses of Praesepe members (Khalaj+, 2013)
J/ApJ/794/143 : New SpeX Observations of M7-L6 Dwarfs (Bardalez+, 2014)
J/A+A/563/A45 : Pleiades cluster membership probabilities (Sarro+, 2014)
J/MNRAS/457/1028 : alpha Per cluster possible members (Sheikhi+, 2016)
J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)
J/AJ/161/160 : BINOCS; NEWFIRM & IRAC IR photo clusters (Thompson+, 2021)
Byte-by-byte Description of file: fig[3569].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- Gaia Gaia DR2 identifier
20- 29 F10.6 deg RAGaia Gaia DR2 Right Ascension (J2015.5)
31- 39 F9.6 deg DEGaia Gaia DR2 Declination (J2015.5)
41- 50 F10.6 deg RAdeg Right Ascension (J2000)
52- 60 F9.6 deg DEdeg Declination (J2000)
62- 66 F5.2 mag W2BPKs The W2-(Gbp-Ks) color (1)
68- 73 F6.2 mag e_W2BPKs ? Uncertainty in W2-(BP-Ks)
75- 80 F6.2 mag HW2W1 ? The (H-W2)-W1 color (1)
82- 86 F5.2 mag e_HW2W1 ? Uncertainty in (H-W2)-W1
--------------------------------------------------------------------------------
Note (1): Data from WISE (W1 and W2), 2MASS (H & Ks) and Gaia DR2 blue passband.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 26-May-2023