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J/A+A/331/581       Rotation and activity in field M dwarfs    (Delfosse+ 1998)

Rotation and chromospheric activity in field M dwarfs Delfosse X., Forveille T., Perrier C., Mayor M. <Astron. Astrophys. 331, 581 (1998)> =1998A&A...331..581D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Space velocities ; Rotational velocities ; Parallaxes, trigonometric Keywords: stars: activity - stars: rotation - stars: chromospheres - stars: coronae - stars: low-mass, brown dwarfs Description: We have obtained high resolution spectra for a volume-limited sample of 118 field M dwarfs. From these observations we derive projected rotational velocities and fluxes in the Hα and Hβ lines. 8 stars are double-lined spectroscopic binaries with measured or probable periods short enough for rotation to be tidally synchronized with the orbit, and another 11 are visual binaries where we cannot yet separate the lines of the two stars. Of the remaining 99 stars, 24 have rotational velocities above our detection limit of ∼2km/s, and some are quite fast rotators, including two with vsini>30km/s and one with vsini∼50km/s. Given the small radii of M dwarfs, these moderate rotational velocities correspond to rather short maximum rotational periods, of only 7-8 hours. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 84 99 Basic parameters of the sample stars table4.dat 86 101 Rotational, activity, and kinematics parameters
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 21 F4.1 s RAs Right ascension (J2000) 23 A1 --- DE- Declination sign 24- 25 I2 deg DEd Declination (J2000) 27- 28 I2 arcmin DEm Declination (J2000) 30- 33 F4.1 arcsec DEs Declination (J2000) 35- 38 A4 --- SpType Spectral type (1) 39 A1 --- n_SpType [a] Note on Spectral type (1) 41- 44 F4.2 mag R-I R-I color index (2) 45 A1 --- n_R-I [bcd] Note on R-I (2) 47- 51 F5.2 mag VMAG V Absolute magnitude 53- 57 F5.2 mag Mbol Bolometric absolute magnitude 59- 61 I3 mas plx Trigonometric parallax 62 A1 --- n_plx [ef] Note on Plx (3) 64- 65 I2 mas e_plx rms uncertainty on plx 67- 72 F6.3 mas/yr pmRA Proper motion in RA (3) 74- 79 F6.3 mas/yr pmDE Proper motion in DE (3) 81- 84 I4 km/s RV Radial velocity
Note (1): Spectral type are from Reid et al (1995AJ....110.1838R), except when n_Type=a, then spectral type from Henry et al. (1994AJ....108.1437H). Note (2): The (R-I) is in Cousin system and is from Leggett's (1992ApJS...82..351L) compilation except when n_R-I=b, data from the CNS3 catalog (Gliese and Jahreiss, 1991, Cat. V/70; the Kron R-I in the CNS3 were transformed to the Cousins system using the Bessell (1983PASP...95..480B) relation, (R-I)c=1.20(R-I)k+0.08); n_R-I=c, data from Bessell (1990A&AS...83..357B); n_R-I=d, data estimated from spectral type, using Leggett's (1992ApJS...82..351L) relation for the Young Disk. Note (3): Parallax and proper motion are from e: the Yale General Catalogue of Trigonometric Stellar Parallaxes (Van Altena et al. 1991, see Cat. I/238), or f: the Hipparcos input catalogue (Turon et al., 1993, Cat. I/196).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Name 11- 15 F5.2 km/s Sig Width of correlation profile (1) 16 A1 --- n_Sig [a] Note on Sig (1) 17- 20 F4.2 km/s e_Sig Standard error on Sig (2) 22 A1 --- l_vsini Limit flag on vsini 23- 27 F5.2 km/s vsini Projected rotational velocities 29- 31 F3.1 km/s e_vsini ? Standard error on vsini (2) 33- 37 F5.2 [10-7W] Lbol Logarithm of bolometric luminosities 39- 43 F5.2 [10-7W] LHalpha ? Logarithm of Hα luminosities 45- 47 F3.2 [10-7W] e_LHalpha ? rms uncertainty on LHalpha 49- 53 F5.2 [10-7W] LHbeta ? Logarithm of Hβ luminosities 55- 58 F4.2 [10-7W] e_LHbeta ? rms uncertainty on LHbeta 61 A1 --- l_Lx Limit flag on Lx 62- 66 F5.2 [10-7W] Lx Logarithm of the X luminosities (3) 68- 70 I3 km/s Uvel Space motion (4) 71 A1 --- n_Uvel [bc] Note on Uvel (5) 73- 76 I4 km/s Vvel Space motion (4) 77 A1 --- n_Vvel [bc] Note on Vvel (5) 79- 82 I4 km/s Wvel Space motion (4) 83 A1 --- n_Wvel [bc] Note on Wvel (5) 85- 86 A2 --- Pop [YDOH ] Dynamic population (6)
Note (1): With a K0 template, except when n_sig=a, then with the M0 template. Note (2): The quoted uncertainty on Sig is that due to photon and readout noise, while the standard error on vsini also includes a 200m/s dispersion on Sig_0, the width of the correlation profile of a non rotating star Note (3): From Schmitt et al. (1995ApJ...450..392S) and the ROSAT all sky survey (Voges et al., 1996, Cat. IX/10). Note (4): The UVW space motion are heliocentric, with U positive toward the Galactic anticenter. Note (5): b: space velocities were computed using an inaccurate radial velocity (±2km/s), because we have not yet covered a full orbital period. c: space velocities use the barycentric radial velocity from Marcy & Chen (1992ApJ...390..550M). Note (6): The code is: YD: young disk YO: young-old disk OD: old disk OH: old disk-Halo H: Halo
Acknowledgements: Xavier Delfosse
(End) Patricia Bauer [CDS] 13-Nov-1997
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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