J/A+A/364/665 Very low mass stars radial velocities (Segransan+, 2000)
Accurate masses of very low mass stars: III. 16 new or improved masses
Segransan D., Delfosse X., Forveille T., Beuzit J.-L., Udry S., Perrier C.,
Mayor M.
<Astron. Astrophys. 364, 665 (2000)>
=2000A&A...364..665S 2000A&A...364..665S
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Stars, nearby
Keywords: stars: binaries: general - stars: binaries: spectroscopic -
stars: binaries: visual - stars: low-mass, brown dwarfs -
techniques: radial velocities - stars: late-type
Abstract:
We have obtained adaptive optics images and accurate radial velocities
for 7 very low mass objects, In the course of a long term effort to
determine accurate masses for very low mass stars (M<0.6 M☉). We
use the new data, together with measurements from the literature for
some stars, to determine new or improved orbits for these 7 systems.
They provide masses for 16 very low mass stars with accuracies that
range between 0.2% and 5%, and in some cases a very accurate distance
as well. This information is used in a companion paper to discuss the
Mass-Luminosity relation for the V, J, H and K photometric bands.
Description:
Files table 4 to 10 contains radial velocity measurements of the
stellar multiple system Gl 234A, YY Gem ab, GJ 2069Aab, Gl 644ABC,
Gl 747AB, Gl 831AB and Gl 866ABC. Files table 11 to 15 contains
angular separation measurements of the multiple stellars system
Gl 234AB, Gl 644A-BC, Gl 747AB, Gl 831AB and Gl 866AC-B.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 45 12 Star positions (from Simbad)
tab4-10.dat 75 170 Radial velocity measurements (table 4 to 10)
tab11-14.dat 78 38 Angular separation measurements (tables 11 to 14)
table15.dat 89 41 Angular separation measurements of Gl 866 AC-B
refs.dat 69 14 References
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See also:
J/MNRAS/301/1031 : High resolution spectra of VLM stars (Tinney+ 1998)
J/A+AS/109/29 : Very low mass stars in Praesepe (Hambly+, 1995)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Star name
8- 11 A4 --- m_Name Components of system
13- 20 A8 --- GJ GJ designation
23- 24 I2 h RAh Right ascension (J2000.0)
26- 27 I2 min RAm Right ascension (J2000.0)
29- 32 F4.1 s RAs Right ascension (J2000.0)
34 A1 --- DE- Declination sign (J2000.0)
35- 36 I2 deg DEd Declination (J2000.0)
38- 39 I2 arcmin DEm Declination (J2000.0)
41- 42 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: tab4-10.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Star name
8- 11 A4 --- m_Name Components of system
13- 24 F12.4 d HJD Julian day of the observation
26- 33 F8.3 km/s RVa Radial velocity measurement of component A
35- 39 F5.3 km/s e_RVa Error associated to Va
41- 48 F8.3 km/s RVb ? Radial velocity measurement of component B
50- 55 F6.3 km/s e_RVb ? Error associated to Vb
57- 63 F7.3 km/s RVc ? Radial velocity measurement of component C
65- 68 F4.2 km/s e_RVc ? Error associated to Vc
70- 71 I2 ---- r_RV Reference of the radial velocity measurement
in refs.dat file
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Byte-by-byte Description of file: tab11-14.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Star name
8- 11 A4 --- m_Name Components of system
13- 23 F11.3 d HJD Julian day of the observation
25- 30 F6.4 arcsec rho ? Separation
32- 36 F5.4 arcsec e_rho ? Error associated to rho
38- 42 F5.1 deg theta ? Angular separation
44- 47 F4.1 deg e_theta ? Error associated to theta
50- 54 F5.3 arcsec proj ? Projected separation
56- 59 F4.3 arcsec e_proj ? Error in projected separation
61- 64 F4.1 deg PA ? Position angle
66- 75 A10 ---- Method Observational method
77- 78 I2 ---- r_rho Reference of the measurement
(in refs.dat file)
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Byte-by-byte Description of file: table15.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Star name
8- 11 A4 --- m_Name Components of system
13- 23 F11.3 d HJD Julian day of the observation
25- 28 F4.3 arcsec rho ? Separation
30- 33 F4.3 arcsec e_rho ? Error associated to rho
35- 39 F5.1 deg theta ? Angular separation
41- 43 F3.1 deg e_theta ? Error associated to theta
45- 49 F5.3 arcsec X ? Separation in North-South direction
51- 54 F4.3 arcsec e_X ? Error associated to X
56- 60 F5.3 arcsec Y ? Separation in East-West direction
62- 65 F4.3 arcsec e_Y ? Error associated to Y
67- 86 A20 ---- Method Observational method
88-108 A21 ---- r_rho Reference of the measurement
(in refs.dat file)
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 42 A19 --- Aut Author's name
44- 64 A21 --- Com Comments
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Acknowledgements: Xavier Delfosse
References:
Forveille et al., Paper I 1999A&A...351..619F 1999A&A...351..619F
Delfosse et al., Paper II 1999A&A...350L..39D 1999A&A...350L..39D
(End) Patricia Bauer [CDS] 28-Nov-2000