J/AJ/101/625 Radial velocities of NGP wide binaries (Latham+, 1991)
A search for wide binaries at the North Galactic Pole using precise radial
velocities.
Latham D.W., Mazeh T., Davis R.J., Stefanik R.P., Abt H.A.
<Astron. J., 101, 625-636 (1991)>
=1991AJ....101..625L 1991AJ....101..625L (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Galactic pole, north ; Stars, double and multiple ;
Radial velocities
Abstract:
We present precise radial velocities from a survey of 247 stars
centered on Selected Area 57 at the North Galactic Pole, complete for
late-type stars with V magnitude brighter than 12.0. The radial
velocities have a typical precision of 0.2-0.3km/s. New spectral types
and distances estimates are presented for 120 of the stars in the
sample. We have considered all pairs of stars with angular separations
between 1 and 600arcsec, and find 11 candidate pairs with velocity
differences less than 1.5km/s. We estimate that 4 or 5 of the 11
candidate pairs are actually bound binaries, but none with separations
larger than 0.1pc. The constraints imposed by these results on the
actual distribution of wide binaries in the Galaxy should now be
reanalyzed. The unusual precision of our velocities led to the
discovery of a new cluster associated with the multiple system ADS
8811 ABC.
Description:
All 244 stars brighter than V magnitude 12.0 in a magnetic tape
version of the Weistrop catalog (1980, private communication) were
observed with the CfA digital speedometers.
Three of the stars near the faint limit of the sample turned out to be
close visual pairs, with angular separations between 1.4 and 4.0
arcsec. Although we do not have accurate photometry of the individual
components in these pairs, we estimate that they are all fainter than
the 12.0mag limit of the survey. Thus our data table has 247 entries.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 79 247 Mean radial velocities
table2.dat 91 10 Stroemgren photometry and distances for a
few stars
table3.dat 58 12 Wide binaries in SA57 and the probability
that they are bound
table4.dat 77 7 Stars in the W11450 groups
notes.dat 80 54 Notes
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Star Weistrop star number
6 A1 --- m_Star [NS] Multiplicity index on Star
8- 9 I2 h RAh Right ascension (B1950)
11- 12 I2 min RAm Right ascension (B1950)
14- 17 F4.1 s RAs Right ascension (B1950)
18 A1 --- DE- Declination sign (B1950)
19- 20 I2 deg DEd Declination (B1950)
22- 23 I2 arcmin DEm Declination (B1950)
25- 26 I2 arcsec DEs Declination (B1950)
28 A1 --- T [MSR] code for the template used to derive
the velocity (1)
30- 32 I3 --- o_RV Number of radial velocity observations
34- 40 F7.2 km/s RV ? Mean radial velocity (or center-of-mass
velocity γ of a binary with a solved
orbit, as noted)
42- 45 F4.2 km/s e_RV ? rms uncertainty on RV
47- 51 F5.2 mag Vmag V magnitude
53 A1 --- n_Vmag [HK] Band if not Vmag in Vmag column
55- 58 I4 pc Dist ? Distance
60- 61 A2 --- Bin Code for the status of our spectroscopic
orbit solutions (2)
63- 76 A14 --- SpType New spectral type (wl for weak lined)
77- 78 A2 --- Qual [abc1 ] Quality code (3)
79 A1 --- Note [*] * indicates a note in notes.dat file
--------------------------------------------------------------------------------
Note (1): Template code as follows:
S = the solar spectrum from a sky exposure
M = an M star exposure
R = special processing needed due to fast rotation
Note (2): Status code as follows:
DO = single-lined spectroscopic binary with an orbital solution
S? = possible velocity variable SO = single-lined spectroscopic binary
with an orbital solution
SP = single-lined spectroscopic binary with a preliminary orbital solution.
SV = giant with periodic low-amplitude velocity variation
TO = triple star with a double-lined spectrum and an orbital solution
Note (3): Quality code as follows:
a = spectrum widening of 0.9mm
b = spectrum widening of 0.6mm
c = spectrum widening of 0.3mm
a1 = spectrum width of 1.0mm
b1 = spectrum width of 0.6mm
c1 = spectrum width of 0.3mm
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Star Weistrop star number
7- 8 I2 h RAh Right ascension (B1950)
10- 11 I2 min RAm Right ascension (B1950)
13- 16 F4.1 s RAs Right ascension (B1950)
17 A1 --- DE- Declination sign (B1950)
18- 19 I2 deg DEd Declination (B1950)
21- 22 I2 arcmin DEm Declination (B1950)
24- 25 I2 arcsec DEs Declination (B1950)
27- 31 F5.2 mag Vmag V magnitude
33- 38 F6.3 mag VmagS Stroemgren V magnitude
40- 43 F4.3 mag b-y Stroemgren b-y colour index
45- 48 F4.3 mag m1 Stroemgren m1 index
50- 53 F4.3 mag c1 Stroemgren c1 index
55- 59 F5.3 mag beta Stroemgren beta index
61- 65 F5.3 mag E(b-y) ? b-y colour excess
67- 69 I3 pc DistK ? Knude distance
71- 73 I3 pc DistA ? Abt distance
75- 77 I3 pc DistY ? Yoss distance
79- 91 A13 --- SpType KPNO spectral type
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Names Weistrop numbers of the two stars in the
candidate pair
15- 20 F6.2 km/s Mean radial velocity
22- 27 F6.1 arcsec theta Angular separation
29- 32 I4 pc Dist Distance
34- 37 F4.2 km/s DRV Radial-velocity difference
39- 42 F4.2 km/s e_DRV rms uncertainty on DRV
44- 49 F6.4 pc Sep Separation
51- 53 F3.1 Msun Mass Mass
55- 58 F4.2 --- Pbound Probability that the binary is bound
--------------------------------------------------------------------------------
Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Name Weistrop binary name (WNNNNNN)
9- 80 A72 --- Note Text of the note
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 31-May-2017