J/AJ/129/2428 M dwarf-white dwarf binary systems (Silvestri+, 2005)
The chromospheric activity and ages of M dwarf stars in wide binary systems.
Silvestri N.M., Hawley S.L., Oswalt T.D.
<Astron. J., 129, 2428-2450 (2005)>
=2005AJ....129.2428S 2005AJ....129.2428S
ADC_Keywords: Stars, double and multiple ; Stars, dwarfs ; Stars, white dwarf ;
Stars, late-type ; Space velocities ; Equivalent widths ;
Proper motions;
Keywords: binaries: visual - Galaxy: structure - stars: activity -
stars: low-mass, brown dwarfs - techniques: spectroscopic -
white dwarfs
Abstract:
We investigate the relationship between age and chromospheric activity
for 139 M dwarf stars in wide binary systems with white dwarf
companions. We present the measured radial velocities and complete
space motions for 161 white dwarf stars in wide binaries.
Description:
The northern portion of the sample was observed spectroscopically
during 32 half-nights with the Astrophysical Research Consortium 3.5m
telescope at the Apache Point Observatory (APO). An additional three
full nights of observing time on the Cerro Tololo Inter-American
Observatory (CTIO) 4m Blanco telescope were used to observe the
systems that could not be seen from the Northern Hemisphere.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 118 203 Complete M dwarf-white dwarf wide binary target list
table2.dat 85 24 Journal of the observations
table3.dat 95 140 Equivalent widths and band-head flux ratios
table4.dat 51 37 Parameters for the dMe and dM(e) stars
table5.dat 99 161 Complete space motions for 161 M dwarf stars
--------------------------------------------------------------------------------
See also:
J/AJ/124/1118 : Radial velocities of high-velocity white dwarfs
(Silvestri+, 2002)
III/70 : Luyten's White Dwarf Catalogues (Luyten, 1970-77)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- ID1 Identifier of the binary system primary
component
13 A1 --- --- [/]
15- 25 A11 --- ID2 Identifier of the binary system secondary
component
27- 28 I2 h RAh Hour of Right Ascension (B1950.0)
30- 31 I2 min RAm Minute of Right Ascension (B1950.0)
33- 34 I2 s RAs Second of Right Ascension (B1950.0)
36 A1 --- DE- Sign of the Declination (B1950.0)
37- 38 I2 deg DEd Degree of Declination (B1950.0)
40- 41 I2 arcmin DEm Arcminute of Declination (B1950.0)
43- 44 I2 arcsec DEs Arcsecond of Declination (B1950.0)
46- 50 F5.2 mag Vmag1 ? Primary V band magnitude (1)
52- 57 A6 --- SpType1 Primary MK spectral type (2)
59- 63 F5.2 mag Vmag2 ? Secondary V band magnitude (1)
65- 70 A6 --- SpType2 Secondary MK spectral type (2)
72- 79 A8 --- Site Telecope observatory (see table2)
81- 94 A14 --- Dates The U.T. dates of the observation (mm/yy)
96- 99 I4 s ExpTime ? Exposure time
101-104 F4.2 arcsec/yr pm Total proper motion
106-110 F5.1 deg pmPA Direction of proper motion (3)
112-114 I3 deg PA ? Position angle centered on the primary (3)
116-118 I3 arcsec Sep Component separation
--------------------------------------------------------------------------------
Note (1): Single-precision V magnitude values are mpg magnitudes from
Luyten's original survey, all others are V magnitudes from
Smith (1997, Ph.D. thesis, Florida Inst. Technol.).
Note (2): Spectral types for the WD and dM stars were determined from
low-resolution (∼7-15Å) spectra (Oswalt, Hintzen, & Luyten
1998ApJS...66..391O 1998ApJS...66..391O; Oswalt et al. 1991, in White Dwarfs, ed.
G. Vauclair & E.M. Sion (NATO ASI Ser. C, 336; Dordrecht: Kluwer),
379 and 1993, in White Dwarfs: Advances in Observation and Theory,
ed. M.A. Barstow (NATO ASI Ser. C, 403; Dordrecht: Kluwer), 419).
Improved dM spectral types are given in Table 3. We have made no
attempt to improve upon the WD spectral types in this study.
Note (3): Measured east of north.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "YYYY/MMM/DD" ObsDate Date of observation (UT)
13- 16 A4 --- Site [APO CTIO] Site of observation
18 A1 --- l_Seeing [~] Limit flag on Seeing
19- 22 F4.1 arcsec Seeing ? Seeing
24- 85 A62 --- Notes Notes
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID The dM identifier
12 A1 --- n_ID Note about the components (G1)
14- 15 I2 h RAh Hour of Right Ascension (B1950)
17- 18 I2 min RAm Minute of Right Ascension (B1950)
20- 21 I2 s RAs Second of Right Ascension (B1950)
23 A1 --- DE- Sign of the Declination (B1950)
24- 25 I2 deg DEd Degree of Declination (B1950)
27- 28 I2 arcmin DEm Arcminute of Declination (B1950)
30- 31 I2 arcsec DEs Arcsecond of Declination (B1950)
33- 37 F5.2 0.1nm EW(Ha) Hα (65630.1nm) equivalent width (1)
39- 42 F4.2 0.1nm E_EW(Ha) Upper limit error on EW(Ha)
44- 47 F4.2 0.1nm e_EW(Ha) Lower limit error on EW(Ha)
49- 52 F4.2 --- CaH1 CaH1 (63850.1nm) flux ratio
54- 57 F4.2 --- CaH2 CaH2 (68300.1nm) flux ratio
59- 62 F4.2 --- CaH3 CaH3 (69750.1nm) flux ratio
64- 67 F4.2 --- TiO1 TiO1 (67200.1nm) flux ratio
69- 72 F4.2 --- TiO2 TiO2 (70590.1nm) flux ratio
74- 77 F4.2 --- TiO3 TiO3 (70940.1nm) flux ratio
79- 82 F4.2 --- TiO4 TiO4 (71320.1nm) flux ratio
84- 87 F4.2 --- TiO5 TiO5 (70500.1nm) flux ratio
89- 93 A5 --- SpType The dM spectral type (2)
95 I1 --- Note Note (G2)
--------------------------------------------------------------------------------
Note (1): In units of Angstroms.
Note (2): Improved dM spectral types based on TiO5 band-head ratios.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Type Star type (dMe or dM(e) stars)
7- 16 A10 --- ID The dM identifier
18- 19 I2 h RAh Hour of Right Ascension (B1950.0)
21- 22 I2 min RAm Minute of Right Ascension (B1950.0)
24- 25 I2 s RAs Second of Right Ascension (B1950.0)
27 A1 --- DE- Sign of the Declination (B1950.0)
28- 29 I2 deg DEd Degree of the Declination (B1950.0)
31- 32 I2 arcmin DEm Arcminute of the Declination (B1950.0)
34- 35 I2 arcsec DEs Arcsecond of the Declination (B1950.0)
37- 40 F4.2 mag V-I V-I color index
42- 46 F5.2 mag vmag Visual magnitude
48- 51 F4.2 solMass Mass Mass
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID The dM identifier
12 A1 --- n_ID Note about the components (G1)
14- 20 F7.4 h RAhour Hour of right Ascension (B1950)
22- 29 F8.4 deg DEdeg Degree of Declination (B1950)
31- 34 F4.2 arcsec/yr pm Proper motion
36- 38 I3 deg pmPA Direction of proper motion
40- 44 F5.1 km/s RV Radial velocity
46- 49 F4.1 km/s e_RV ? Uncertainty in RV
51- 56 F6.1 km/s Uvel Velocity towards the Galactic anticenter
relative to the LSR
58- 61 F4.1 km/s e_Uvel ? Uncertainty in Uvel
63- 68 F6.1 km/s Vvel Velocity in the direction of galactic
rotation relative to the LSR
70- 73 F4.1 km/s e_Vvel ? Uncertainty in Vvel
75- 80 F6.1 km/s Wvel Velocity toward the North Galactic Pole
relative to the LSR
82- 85 F4.1 km/s e_Wvel ? Uncertainty in Wvel
87- 91 F5.1 km/s SpVel Full space velocity
93- 95 F3.1 km/s e_SpVel ? Uncertainty in SpVel
97- 99 A3 --- Note Comma separated notes (G2)
--------------------------------------------------------------------------------
Global Notes:
Note (G1): Flag on ID, defined as follows:
a = Stellar halo white dwarf candidate.
b = M dwarf has close (eclipsing) companion.
Note (G2): Note, defined as follows:
1 = dMe Stars;
2 = dM(e) Stars;
3 = dM Stars;
4 = V and MV are from the white dwarf companion.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 12-Sep-2005