J/PAZh/41/896 Short- and long-term pm of close dwarfs (Khovritchev+, 2015)
Δµ binaries among large proper motion stars.
Khovritchev M.Yu., Kulikova A.M.
<Pis'ma Astron. Zh. 41, 896 (2015)>
=2015PAZh...41..896K 2015PAZh...41..896K (SIMBAD/NED BibCode)
=2015AstL...41..833K 2015AstL...41..833K
ADC_Keywords: Stars, double and multiple ; Stars, dwarfs ; Positional data;
Proper motions
Keywords: Galactic solar neighbourhoods - stars with large proper motions -
astrometric binaries
Abstract:
Motions of 1308 stars with large proper motions (µ>300mas/yr) up to
17 mag were investigated using the results of observations conducted
with Pulkovo Normal Astrograph and images taken from data bases of sky
surveys (DSS, SDSS DR12, WISE). Basic idea of search of double stars
with this material is a comparison between long-term proper motion
(POSS2-POSS1, epoch difference is about 50yr) and short-term proper
motion (2MASS, SDSS, WISE, Pulkovo, epoch difference is about 10yr).
Star is classified as delta-mu-binary candidate in the case of
statistically significant difference of short-term and long-term
proper motions. This condition is realised for 121 stars of our target
list. Additional evidence of duplicity was obtained with comparison of
our proper motions with data of several parallax determination
programs. Analysis of accurate SDSS photometric values of our stars
allows us to conclude that four stars (J0656+3827, J0838+3940,
J1229+5332, J2330+4639) are probably binary systems which consist of
wite dwarf + M-dwarf.
Description:
All results are collected into four tables.
Additional data are presented besides of proper motions and
F-criterium estimations (differences between ours and LSPM proper
motions, photometric and trigonometric parallaxes, magnitudes for
various bands, matching with WDS catalogue (B/wds)). Robustness of
determination of short-term proper motion is significantly depended on
the epoch difference. That is why all material was divided into two
parts. First of them contains stars with epoch differences more than 5
years. Other stars were included into the second list. There are no
signs of nonlinear motion for 944 of the stars of the first sample.
And 121 of our target stars are delta-mu-binary candidates. The second
group contains 229 of the 'single' stars and 14 of the delta-mu-binary
candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lpmsm15b.dat 687 121 Delta-mu-binary candidates with epoch difference
more than 5 years
lpmsm15s.dat 687 944 'Single' candidates with epoch difference
more than 5 years
lpmsl15b.dat 687 14 Delta-mu-binary candidates with epoch difference
less than 5 years
lpmsl15s.dat 687 229 'Single' candidates with epoch difference
less than 5 years
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/298 : LSPM-North Catalog (Lepine+ 2005)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
Byte-by-byte Description of file: lpms*.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- LSPM LSPM-north (Cat. I/298) catalogue ID
13- 14 I2 h RAh Right ascension (J2000) (1)
16- 17 I2 min RAm Right ascension (J2000)
19- 25 F7.4 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000) (1)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 39 F6.3 arcsec DEs Declination (J2000)
41- 46 I6 mas e_RAs Standard error in RA
48- 53 I6 mas e_DEs Standard error in Dec
55- 63 F9.1 mas/yr pmRA Proper motion in Right ascension (2)
65- 73 F9.1 mas/yr pmDE Proper motion in Declination (2)
75- 80 F6.1 mas/yr e_pmRA Standard error of proper motion in RA
82- 87 F6.1 mas/yr e_pmDE Standard error of proper motion in Dec
89-100 F12.4 yr Epoch Average epoch of RA, DE
102-110 F9.1 mas/yr ltpmRA ? Long-term proper motion in RA (3)
112-120 F9.1 mas/yr ltpmDE ? Long-term proper motion in DE (3)
122-127 F6.1 mas/yr e_ltpmRA ? Standard error of long-term mu in RA
129-134 F6.1 mas/yr e_ltpmDE ? Standard error of long-term mu in DE
136-144 F9.1 mas/yr stpmRA ? Short-term proper motion in RA (4)
146-154 F9.1 mas/yr stpmDE ? Short-term proper motion in DE (4)
156-161 F6.1 mas/yr e_stpmRA ? Standard error of short-term mu in RA
163-168 F6.1 mas/yr e_stpmDE ? Standard error of short-term mu in DE
170-181 F12.4 yr stepoch ? Average epoch short-term proper motion
183-190 F8.4 yr maxEpDiff ? Maximum short-term epoch difference
192-199 F8.2 --- F ? F-criterion value
201-208 F8.2 --- limF ? 0.95 limit for F-criterion (5)
212-213 I2 --- N [3/11]? Number of epochs for proper motion
217 I1 --- dmuFl [0/1]? Delta-mu-candidate flag (6)
221 I1 --- WDSfl [0/1] WDS-flag (WDSfl≡1 if star is in WDS)
226-231 F6.1 mas/yr DpmRA Difference 'mu - LSPM mu' in RA
236-241 F6.1 mas/yr DpmDE Difference 'mu - LSPM mu' in DE
245-249 F5.2 mag Vmag ?=99.90 LSPM estimated V-magnitude
253-257 F5.2 mag V-J ?=99.90 LSPM V-J color index
260-262 I3 mas plxph Photometric parallax from LSPM V-J
264-268 F5.1 mas plxYa ? Yale trigonometric parallax
271-274 F4.1 mas e_plxYa ? Yale parallax standard error
278-283 F6.2 --- yaF ? F-criterion for 'mu - Yale mu' (7)
285-289 F5.1 mas plxMe ? MEarth trigonometric parallax
291-295 F5.1 mas e_plxMe ? MEarth parallax standard error
300-304 F5.2 --- MehF ? F-criterion for 'mu - MEarth mu'
306-310 F5.1 mas plxPu ? Pulkovo trigonometric parallax
312-316 F5.1 mas e_plxPu ? Pulkovo parallax standard error
321-325 F5.2 --- PuF ? F-criterion for 'mu - Pulkovo mu'
328-331 F4.2 --- pfDiffRA Maximum difference of plx facs in RA
334-337 F4.2 --- pfDiffDE Maximum difference of plx facs in DE
340-346 F7.1 mas/yr DPMRAu4 ? Difference 'mu - UCAC4 mu' in RA (8)
349-355 F7.1 mas/yr DPMDEu4 ? Difference 'mu - UCAC4 mu' in DE (8)
358-364 F7.2 --- u4F ? F-criterion for 'sh-term mu-UCAC4 mu'
366 I1 --- Fflag [0/1]? Flag for F-criteria (9)
370 I1 --- obtype [0/8]? Object type UCAC4(see UCAC4 ReadMe)
373-374 I2 --- cdsf ? Combined double star flag from UCAC4
376-381 F6.3 mag BmagA ? B magnitude from APASS
383-388 F6.3 mag VmagA ? V magnitude from APASS
390-395 F6.3 mag gmagA ? g magnitude from APASS
397-402 F6.3 mag rmagA ? r magnitude from APASS
404-409 F6.3 mag imagA ? i magnitude from APASS
411-416 F6.2 mag e_BmagA ? Error of B magnitude from APASS
418-423 F6.2 mag e_VmagA ? Error of V magnitude from APASS
425-430 F6.2 mag e_gmagA ? Error of g magnitude from APASS
432-437 F6.2 mag e_rmagA ? Error of r magnitude from APASS
439-444 F6.2 mag e_imagA ? Error of i magnitude from APASS
446-451 F6.3 mag Jmag ? J magnitude from 2MASS (Cat. II/246)
453-458 F6.3 mag Hmag ? H magnitude from 2MASS
460-465 F6.3 mag Ksmag ? Ks magnitude from 2MASS
467-472 F6.3 mag e_Jmag ? Error of J magnitude from 2MASS
474-479 F6.3 mag e_Hmag ? Error of H magnitude from 2MASS
481-486 F6.3 mag e_Ksmag ? Error of Ks magnitude from 2MASS
488 I1 --- sdssFlag [0/2] SDSS flag (10)
490-495 F6.3 mag umag ? u magnitude from SDSS (Cat. V/139)
497-502 F6.3 mag gmag ? g magnitude from SDSS
504-509 F6.3 mag rmag ? r magnitude from SDSS
511-516 F6.3 mag imag ? i magnitude from SDSS
518-523 F6.3 mag zmag ? z magnitude from SDSS
525-530 F6.3 mag e_umag ? Error of u magnitude from SDSS
532-537 F6.3 mag e_gmag ? Error of g magnitude from SDSS
539-544 F6.3 mag e_rmag ? Error of r magnitude from SDSS
546-551 F6.3 mag e_imag ? Error of i magnitude from SDSS
553-558 F6.3 mag e_zmag ? Error of z magnitude from SDSS
560-565 F6.3 mag W1mag ? W1 magnitude from WISE (Cat. II/311)
567-572 F6.3 mag W2mag ? W2 magnitude from WISE
574-579 F6.3 mag W3mag ? W3 magnitude from WISE
581-586 F6.3 mag W4mag ? W4 magnitude from WISE
588-593 F6.3 mag e_W1mag ? Error of W1 magnitude from WISE
595-600 F6.3 mag e_W2mag ? Error of W2 magnitude from WISE
602-607 F6.3 mag e_W3mag ? Error of W3 magnitude from WISE
609-614 F6.3 mag e_W4mag ? Error of W4 magnitude from WISE
616-620 I5 mas IR-OPTd ? IR-OPT displacement (11)
622-626 F5.1 --- IR-OPTsnr ? IR-OPT displacement signal-to-noise ratio
628-633 F6.3 --- mAsy Mean asymmetry of stellar image
635-640 F6.3 --- minAsy Minimum asymmetry of stellar image
642-647 F6.3 --- maxAsy Maximum asymmetry of stellar image
649-653 A5 --- survey Text mark of survey (12)
655-664 A10 --- WDS WDS ID (Cat. B/wds)
666-671 F6.2 arcsec rho ? Angular separation from WDS (epoch2)
673-675 I3 deg theta ? Positional Angle from WDS (epoch2)
677-681 F5.2 mag magp ? Magnitude of primary from WDS
683-687 F5.2 mag mags ? Magnitude of secondary from WDS
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Note (1): These are positions RA, DE (at average epoch "Epoch") on ICRS and
their standard errors calculated as a result of LSM fitting of all epochs
positions
Note (2): These are proper motions and their standard errors calculated as a
result of LSM fitting of all data.
Note (3): Long-term proper motion components (poss2-poss1) and their standard
errors
Note (4): Short-term proper motion components (2MASS,SDSS,Pulkovo, WISE) and
their standard errors. LSM fitting was used in the case of more than
two points.
Note (5): This is threshold criterion value. It means that F<Flim with
0.95 probability in the case of normal distribution of positional errors.
F>Flim is appropriate to great chance of nonlinear motion.
Note (6): Delta-mu-binary candidate flag (dmuFl≡1). dmuFl≡0 for single
star candidates.
Note (7): Pulkovo program targets were previously included into the lists of
various parallax determination projects (Yale, MEarth, Pulkovo).
And the values of parallaxes and their errors are presented. Accurate
short-term proper motion (epoch differences are about 2-3 yr) is
natural result of parallax determination. We decided that it was
interesting to compute F-criterion value with 'mu - PlxProgram mu'
(PlxProgram denotes appropriate parallactic project, for example, Yale).
It gives additional information for analysis of probable binarity of star.
Note (8): Many of Pulkovo target stars were included into the UCAC4 catalogue.
The values of UCAC4 (Zacharias et al., 2012, Cat. I/322) fast star's proper
motions were taken from LSPM. The values of proper motion differences
(Pulkovo - UCAC4), F-criterion and agreement flag are provided.
Two flags from the UCAC4 are placed here ('object type' and 'combined
double star flag'). They are described in the UCAC4 ReadMe (I/322).
Note (9): This flag (see Note (8)) is equal to 1 in the case of agreement
between our results and the results of comparison with the UCAC4 data.
Note (10): SDSS flag as follows:
1 = normal matching
2 = SDSS source catalogue matching contains very faint stars which are very
close to investigated star
Note (11): Position of the photocenter of double star with low luminosity
component is strongly depend on photometric band used in many cases.
It is especially seen in the case of comparison of optical and
infrared positions. Therefore a special proper motion was determined.
It was based on optical four epochs data only. Photocenter positions
for 'optical' band and infrared band (2MASS) were calculated at 2MASS
observational epoch. It allows us to compute angular distance
(IR-OPT distance) between both photocenters and compare it with
positional errors. As a result we provide this IR-OPT distance in
the case of signal-to-noise is more than 5.
Note (12): Text mark of survey may be poss1, poss2, 2mass, sdss,
pna1, pna2 (Pulkovo Normal Astrograph), wise.
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Acknowledgements:
Maxim Khovritchev, deimos(at)gao.spb.ru
(End) M. Khovritchev [Pulkovo Obs., Russia], P. Vannier [CDS] 20-Jul-2015