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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
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; 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) Halpha (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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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