J/A+A/587/A51 Overlooked wide companions of nearby F stars (Scholz, 2016)
Overlooked wide companions of nearby F stars.
Scholz R.-D.
<Astron. Astrophys. 587, A51 (2016)>
=2016A&A...587A..51S 2016A&A...587A..51S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, nearby ; Stars, F-type ;
Proper motions ; Parallaxes, trigonometric
Keywords: proper motions - stars: abundances - binaries: general -
stars: low-mass - white dwarfs - solar neighbourhood
Abstract:
We checked a sample of 545 F stars within 50pc for wide companions
using existing near-infrared and optical sky surveys.
Description:
We checked a sample of 545 F stars within 50pc for wide companions
using existing near-infrared and optical sky surveys. Applying the
common proper motion (CPM) criterion, we detected wide companion
candidates with 6-120arcsec angular separations by visual inspection
of multi-epoch finder charts and by searching in proper motion
catalogues. Final proper motions were measured by involving positional
measurements from up to eleven surveys. Spectral types of red CPM
companions were estimated from their absolute J-band magnitudes based
on the Hipparcos distances of the primaries. In addition to about 100
known CPM objects, we found 19 new CPM companions and confirmed 31
previously known candidates. A few CPM objects are still considered as
candidates according to their level of proper motion agreement. Among
the new objects there are nine M0-M4, eight M5-M6, one ∼L3.5 dwarf
(HD 3861B), and one white dwarf (WD) (HD 2726B), whereas we confirmed
two K, 19 M0-M4, six M5-M6, two early-L dwarfs, and two DA WDs as CPM
companions. In a few cases, previous spectral types were available
that all agree well with our estimates. Two companions (HD 22879B and
HD 49933B) are associated with moderately metal-poor Gaia benchmark
stars. One doubtful CPM companion, spectroscopically classified as WD
but found to be very bright (J=11.1) by others, should either be a
very nearby foreground WD or a different kind of object associated
with HD 165670. The main results of this research note, data on new,
confirmed, and rejected CPM pairs, are listed in tablea1.dat,
tableb1.dat, and tablec1.dat, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 163 38 New CPM companions of nearby F stars
tableb1.dat 163 62 Confirmed CPM companions of nearby F stars
tablec1.dat 163 4 Rejected CPM pairs including F stars
notes.dat 80 64 Notes
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See also:
B/wds : Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
I/329 : URAT1 Catalog ((Zacharias+ 2015)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/150/141 : UrHip Proper Motion Catalog (Frouard+, 2015)
Byte-by-byte Description of file: tablea1.dat tableb1.dat tablec1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name HD Name of F star primary or CPM companion (1)
12- 15 A4 --- f_Name Uncertainty flag on Name (2)
17- 25 A9 --- n_Name Notes on name in notes.dat file (2)
27- 37 F11.7 deg RAdeg Right Ascension (J2000, at given Epoch)
39- 49 F11.7 deg DEdeg Declination (J2000, at given Epoch)
51 A1 --- n_pos Note on RA and DE in notes.dat file (3)
53- 60 F8.3 yr Epoch Epoch of RA and DE
62- 66 F5.2 mas Plx ? Parallax of F star primary
68- 72 F5.2 mas e_Plx ? Error of Parallax of F star primary
74- 78 F5.1 arcsec Sep ? Separation of CPM companion
80- 82 I3 deg PA ? Position Angle of CPM companion
84 A1 --- n_Sep Note on Sep and PA, in notes.dat file (3)
86- 91 F6.1 mas/yr pmRA Proper motion in RA*cos(DE) (4)
93- 96 F4.1 mas/yr e_pmRA Error of proper motion in RA*cos(DE) (4)
98-103 F6.1 mas/yr pmDE Proper motion in DE (4)
105-108 F4.1 mas/yr e_pmDE Error of proper motion in DE (4)
110-114 A5 --- n_pmRA Notes on pmRA and pmDE, in notes.dat file (3)
116-126 A11 --- o_Epoch Number of epochs used for pmRA and pmDE (5)
128-133 F6.3 mag Jmag J-band magnitude (6)
135-139 F5.3 mag e_Jmag ? Error of J-band magnitude (6)
141-143 A3 --- n_Jmag Note on J-band magnitude, in notes.dat file (3)
145-153 A9 --- SpType Spectral type
155 A1 --- n_SpType Note on Spectral type, in notes.dat file (3)(7)
157-163 A7 --- Refs References (8)
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Note (1): The names of the primaries are given as HD numbers and letters A or AB
(in case of unresolved binaries). The names of the CPM companions are given
as HD numbers and letters B or C-H in agreement with or extending previously
known (physical or visual) component designations in the Washington Double
Star (WDS) catalogue.
In case of tablec1.dat, HD or HIP names are given.
Note (2): Possible CPM companions, for which at least one of the proper motion
components agreed only to within 3 sigma with that of the primary, are
marked with (?).
Objects with even larger discrepancies, which were considered as doubtful
CPM companions, are marked by (??).
Note (3): Notes are given as individual small letters (a-z) and/or digits (1-9),
separated by commas. A maximum of five notes separated by commas corresponds
to the format A9. If only one note is used, the format is A1. The file
notes.dat contains 35 rows, one for each of the letters a-z and digits 1-9.
Note (4): Proper motions and their errors derived in this paper are rounded
to integer values of mas/yr.
Note (5): The 11-digit string o_epochs gives the number of epochs from SSS/APM,
2MASS, DENIS, UCAC4, CMC, SDSS, IPHAS, UKIDSS, WISE, URAT1, and VISTA,
which were used in the proper motion determination (of the CPM companion).
Note (6): Most J magnitudes and their errors were taken from 2MASS (or DENIS)
and rounded to 0.01 mag.
Note (7): The spectral types of the mostly red CPM companions derived in this
paper are based on the known distances of the primaries and the relation
between absolute J magnitude and (early-K to late-L) spectral type from
Scholz, Meusinger & Jahreis (2005A&A...442..211S 2005A&A...442..211S, Cat. J/A+A/442/211).
The companions of metal-poor primaries were considered as subdwarf
candidates. Blue CPM companions were assumed to be white dwarfs.
Note (8): Four references are given for:
- Position/Epoch,
- parallax of the primary (OR angular separation and position angle of the
CPM companion, where small epoch differences of <0.3yr were neglected in
case of URAT1 data),
- proper motion,
- spectral type.
The four references are given as digits (1-9) or capital letters
(S,G, or L), separated by commas.
References as follows:
1 = URAT1 (Zacharias et al., 2015AJ....150..101Z 2015AJ....150..101Z, Cat. I/329)
2 = 2MASS (Skrutskie et al., 2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233)
3 = Hipparcos (van Leeuwen, 2007A&A...474..653V 2007A&A...474..653V, Cat. Cat. I/311)
4 = UrHip (Frouard et al., 2015AJ....150..141F 2015AJ....150..141F, Cat. J/AJ/150/141)
5 = this paper
6 = UKIDSS GPS (Lucas et al., 2008MNRAS.391..136L 2008MNRAS.391..136L, Cat. II/316)
7 = UKIDSS LAS (Lawrence et al., 2007MNRAS.379.1599L 2007MNRAS.379.1599L, Cat. II/314)
8 = Tycho-2 (Hog et al., 2000A&A...355L..27H 2000A&A...355L..27H, Cat. I/259)
9 = corrected Hipparcos data (Fabricius & Makarov, 2000A&AS..144...45F 2000A&AS..144...45F,
Cat. J/A+AS/144/45
S = SIMBAD
G = SPM4 (Girard et al., 2011AJ....142...15G 2011AJ....142...15G, Cat. I/320)
L = Limoges et al. (2013AJ....145..136L 2013AJ....145..136L, Cat. J/AJ/145/136)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note Note code, letters a-z, digits 1-9
3- 80 A78 --- Text Text of the note
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Acknowledgements:
Ralf D. Scholz, rdscholz(at)aip.de
(End) R.-D. Scholz [AIP], Patricia Vannier [CDS] 03-Feb-2016