2 Observations and data reduction

The spectroscopic echelle observations of the stars analysed in this paper were obtained during three observing runs:

1) 2.2 m-FOCES 1999/07
This took place on 24-29 July 1999 using the 2.2 m telescope at the German Spanish Astronomical Observatory (CAHA) (Almería, Spain). The Fibre Optics Cassegrain Echelle Spectrograph (FOCES) (Pfeiffer et al. 1998) was used with a 2048² 15$\mu$ LORAL$\char93$11i CCD detector. The wavelength range covers from 3910 to 9075 Å$\$ in 84 orders. The reciprocal dispersion ranges from 0.03 to 0.07 Å/pixel and the spectral resolution, determined as the full width at half maximum (FWHM) of the arc comparison lines, ranges from 0.09 to 0.26 Å.

2) NOT-SOFIN 1999/11
Observations taken on 26-27 November 1999 using the 2.56 m Nordic Optical Telescope (NOT) located at the Observatorio del Roque de Los Muchachos (La Palma, Spain). The Soviet Finnish High Resolution Echelle Spectrograph (SOFIN) was used with an echelle grating (79 grooves/mm), Astromed-3200 camera and a 1152$\times$770 pixel EEV P88200 CCD detector. The wavelength range covers from 3525 to 10425 Å$\$ in 44 orders. The reciprocal dispersion ranges from 0.06 to 0.17 Å/pixel and the spectral resolution (FWHM) from 0.14 to 0.32 Å.

3) INT-MUSICOS 2000/01
Observations make on 18-22 January 2000 with the 2.5 m Isaac Newton Telescope (INT) at the Observatorio del Roque de Los Muchachos (La Palma, Spain) using the ESA-MUSICOS spectrograph. This is a fibre-fed cross-dispersed echelle spectrograph, built as a replica of the first MUSICOS spectrograph (Baudrand & Böhm 1992) and developed as part of MUlti-SIte COntinuous Spectroscopy (MUSICOS) project. During this observing run, a 1024² 24$\mu$ TEK5 CCD detector was used, obtaining wavelength coverage from 4430 Å$\$ to 10225 Å$\$ in 73 orders. The reciprocal dispersion ranges from 0.07 to 0.15 Å$\$and the spectral resolution (FWHM) from 0.16 to 0.30 Å.

The sample of late-type stars analysed in this paper as well as the the non-active stars used as reference stars in the spectral subtraction and the radial velocity standards used in the radial velocity determinations are listed in Tables 1 and 2. In Table 1 we give the observing log. For each observation we list date, UT and the signal to noise ratio (S/N) obtained in the Ca  II H & K and H$\alpha$ line regions. Table 2 shows the name, HD number, and other stellar parameters such as the spectral type ( $T_{\rm sp}$), color indexes V-R and B-V, rotational velocity ($v\sin{i}$), rotational period ( $P_{\rm phot}$). The V-R and B-V color indexes are obtained from the relation with spectral type given by Landolt-Börnstein (Schmidt-Kaler 1982) when individual values are not given in the literature. Other parameters are taken from the references given in the individual results of each star. The Galactic space motions (U, V, W) given in Table 2 have been determined by us as explained in the next section.

The spectra have been extracted using the standard reduction procedures in the IRAF package (bias subtraction, flat-field division and optimal extraction of the spectra). The wavelength calibration was obtained by taking spectra of a Th-Ar lamp. Finally, the spectra were normalized by a polynomial fit to the observed continuum.

 

 

Table 2: Stellar parameters.

Name	HD/BD	T$_{\rm sp}$	V-R	B-V	$v\sin{i}$	$P_{\rm phot}$	$U\pm \sigma_{U}$	$V \pm \sigma_{V}$	$W \pm \sigma_{W}$
					(km s-1)	(days)	(km s-1)	(km s-1)	(km s-1)
LA
PW And	HD 1405	K2V	0.74	1.00	23.4	1.75	$-5.42\pm0.33$	$-28.69\pm0.63$	$-17.94\pm0.74$
V368 Cep	HD 220140	K1V	0.61	0.87	16.1	2.74	$-10.16\pm0.25$	$-23.48\pm0.16$	$-5.45\pm0.10$
V383 Lac	BD+48 3686	K1V	0.69	0.83	19.8	2.42	$-7.06\pm1.43$	$-22.19\pm0.34$	$-3.90\pm0.86$
EP Eri	HD 17925	K1V	0.69	0.86	6.2	6.85	$-15.01\pm0.10$	$-21.80\pm0.18$	$-8.68\pm0.11$
DX Leo	HD 82443	K0V	0.64	0.78	6.2	5.377	$-9.91\pm0.15$	$-22.83\pm0.36$	$-5.61\pm0.23$
GJ 211	HD 37394	K1V	0.69	0.84	4.0	10.86	$-12.89\pm0.23$	$-23.35\pm0.27$	$-14.55\pm0.18$
HD 77407	BD+38 1993	G0	0.50	0.61	7.0*	$-10.10\pm0.30$	$-23.91\pm0.70$	$-7.12\pm0.38$
EK Dra	HD 129333	G1.5V	0.52	0.59	17.3	2.787	$-7.25\pm0.32$	$-29.07\pm0.42$	$-4.65\pm0.35$
UMa
V834 Tau	HD 29697	K4V	0.91	1.09	9.5	3.936	$5.71\pm0.31$	$-3.60\pm0.09$	$-21.04\pm0.37$
$\pi ^{1}$ UMa	HD 72905	G1.5V	0.52	0.62	9.7	4.68	$11.24\pm0.09$	$-0.10\pm0.10$	$-10.99\pm0.09$
GJ 503.2	HD 115043	G2V	0.53	0.67	7.5		$14.52\pm0.26$	$2.19\pm0.21$	$-8.08\pm0.27$
Others
LQ Hya	HD 82558	K2V	0.64	0.91	25	1.66	$-20.36\pm0.35$	$-5.45\pm0.17$	$-9.28\pm0.28$
GJ 577	HD 134319	G5	0.54	0.68		4.448	$-32.45\pm1.05$	$-13.59\pm0.35$	$-2.82\pm0.20$
GJ 3706	HD 105631	K0V	0.64	0.80	4.5		$-28.26\pm0.86$	$-22.43\pm0.61$	$-7.55\pm1.93$
Ref. Stars
107 Psc	HD 10476	K1V
GJ 706	HD 166620	K2V
GJ 758 *	HD 182488	G8V
HR 8088	HD 201196	K2IV
GJ 639	HD 151877	K7V
GJ 679	HD 159222	G5V
$\beta$ Oph *	HD 161096	K2III
61 Cyg A	HD 201092	K5V
61 Cyg B	HD 201092	K7V
HR 7949	HD 197989	K0III
HR 166 *	HD 3651	K0V
HR 222 *	HD 4628	K2V
HR 8832	HD 219134	K3/4V
$\beta$ Gem *	HD 62509	K0III
Sun	-	G2V