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1 Introduction


 

 
Table 1: Observing log
Name NOT-SOFIN 1996/03   NOT-SOFIN 1998/04   McD-Sandiford 1998/01   INT-MUSICOS 1999/01
  Day UT $\varphi$ S/N   Day UT $\varphi$ S/N   Day UT $\varphi$ S/N   Day UT $\varphi$ S/N
        (H$\alpha $)         (H$\alpha $)         (H$\alpha $)         (H$\alpha $)
Active Stars                                      
UX Ari 01 21:45 0.95 171                              
12 Cam           09 20:00 0.64 228                    
V1149 Ori           06 20:07 0.89 76                    
OU Gem 01 22:55 0.80 303   05 19:56 0.19 274             07 01:43 0.70 137
            09 20:28 0.77 199                    
$\sigma $ Gem 02 00:30 0.81 528   06 20:48 0.88 188                    
BF Lyn 02 01:14 0.43 249   05 20:57 0.49 135   18 09:47 0.12 109   07 02:54 0.11 68
"           07 21:56 0.02 176   18 13:05 0.16 116          
"           09 21:17 0.54 201   19 10:41 0.40 170          
"                     20 11:46 0.67 146          
"                     21 10:28 0.92 78          
"                     22 10:07 0.18 181          
IL Hya           06 22:00 0.02 117                    
FG UMa           05 21:55   168                    
"           09 22:00   166                    
LR Hya           06 22:50 0.58 73                    
HU Vir           06 23:39 0.29 63   15 11:33 0.44 74          
"           07 23:36 0.38 83   16 11:58 0.54 120          
"                     17 11:46 0.64 85          
"                     18 12:05 0.73 95          
"                     19 12:03 0.83 138          
"                     20 12:05 0.93 113          
"                     21 12:10 0.02 74          
"                     22 11:50 0.12 112          
DK Dra 02 03:15 0.90 234   06 21:30 0.84 88                    
BQ CVn           07 22:40   201                    
IS Vir           09 23:05   145                    
BL CVn           11 02:26 0.21 174                    
BM CVn           09 22:38 0.26 191                    
MS Ser           08 05:05 0.21 187                    
"           11 06:04 0.54 60                    
Ref. Stars                                      
$\beta $ Gem 02 22:05 - 169                              
$\alpha $ Tau 02 21:53 - 195                       07 00:42 - 474
6 Lyn           09 21:01 - 196                    
$\alpha $ Boo           06 01:05 - 335   16 12:59 - 349   07 05:13 - 542
"           08 00:41 - 305                    
54 Psc                     15 01:10 - 203          
HR 1614                     17 04:35 - 194          


This paper is a continuation of our ongoing project of multiwavelength optical observations aimed at studying the chromosphere of active binary systems using the information provided for several optical spectroscopic features that are formed at different heights in the chromosphere. In Paper I (Montes et al. 1997) we focussed our study on the analysis of the extensively used H$\alpha $ chromospheric activity indicator together with simultaneous observations of the less studied He  I D3 and Na  I D1, D2 spectral features in a sample of 18 northern active binary systems. In Paper II (Montes et al. 1998a) the H$\alpha $, H$\beta $, Na  I D1, D2, He  I D3, Mg  I b triplet, Ca  II H & K and Ca  II infrared triplet lines (Ca  II IRT) of the RS CVn system EZ Pegasi were studied at different orbital phases, also including a high resolution echelle spectrum.

As shown in Papers I and II, with the simultaneous analysis of the different optical chromospheric activity indicators and using the spectral subtraction technique, it is possible to study in detail the chromosphere, discriminating between the different structures: plages, prominences, flares and microflares (see recent studies by Gunn & Doyle 1997; Gunn et al. 1997; Lázaro & Arévalo 1997; Arévalo & Lázaro 1999; Hall & Wolovitz 1998; Montes et al. 1998b; Montes & Ramsey 1998, 1999; Montes et al. 1999; Eibe et al. 1999; Oliveira & Foing 1999; Berdyugina et al. 1999).

In this paper we present high resolution echelle spectra of 16 systems selected from "A Catalog of Chromospherically Active Binary Stars (second edition)'' (Strassmeier et al. 1993, hereafter CABS). The spectra were taken during four observing runs (from 1996 to 1999) and include all the optical chromospheric activity indicators from the Ca  II H & K to Ca  II IRT lines. Preliminary results of some of the systems included here can be found in Sanz-Forcada et al. (1998, 1999), Montes et al. (1998c, 2000b), Latorre et al. (1999, 2000).

In Sect. 2 we give the details of our observations and data reduction. In Sect. 3 we describe the spectroscopic features analysed in this paper: the different chromospheric activity indicators and the Li  I $\lambda $6707.8 line. Individual results about stellar parameters and the behaviour of the chromospheric excess emission in each system is reported in Sect. 4. Finally, in Sect. 5 the discussion and conclusions are given.


 

 
Table 2: Stellar parameters
HD Name $T_{\rm sp}$ SB R V-R B-V $T_{\rm conj}$ $P_{\rm orb}$ $P_{\rm rot}$ Vsin i
        ($R_{\odot}$)     (HJD) (days) (days) (km s-1)
Active Stars                    
21242 UX Ari G5V/K0IV 2 0.93/>4.7 0.54/0.70 0.91 2450415.0647 6.437876 $\approx P_{\rm orb}$ 6/37
32357 12 Cam K0III 1 $\geq$16 [0.77] 1.12 2448111.1 80.898 81.23 11.3
37824 V1149 Ori K1III 1 /$\geq$11 0.90 1.14 2444325.93 53.580 54.1 11
45088 OU Gem K3V/K5V 2 0.77/0.72 [0.82/0.99] [0.96/1.15] 2443846.2 6.991868 7.36 5.6/5.6
62044 $\sigma $ Gem K1III 1 >10.5 0.92 1.122 2447227.22 19.604471 19.601562 27
80715 BF Lyn K2V/[dK] 2 >0.78/>0.78 [0.74/] 0.99 2445802.472 3.80406 $\approx P_{\rm orb}$ 10/10
81410 IL Hya G8V/K0III-IV 2 1.0/8.1 0.79 1.02 2447103.1723 12.904982 12.730 26.5
89546 FG UMa G8IV 1 >6.4 0.64 1.004   21.300 21.50 15
91816 LR Hya K0V/K0V 2 $\geq$0.8/$\geq$0.8 [0.64/0.64] [0.81/0.81] 2446539.89 6.86569 3.1448 6/6
106225 HU Vir K0III-IV 1 >5.7 [0.705] 0.974 2450195.909 10.3876 10.42 31.3
106677 DK Dra K1III/K1III 2 $\geq$13/$\geq$13 [0.81/0.81] [1.07/1.07] 2443445.95 64.44 63.75 10/10
112859 BQ CVn F/K0III 2 />6.2 [0.77] 0.93   18.700 18.50 <6/17
113816 IS Vir K0III 1 >2.3 0.93 1.15   23.700 23.50 6
115781 BL CVn G-KIV/K0III 2 /14.8 [/0.77] 1.14 2445284.47 18.6917 $\approx P_{\rm orb}$ 7/35
116204 BM CVn K1III 1 $\geq$6 [0.81] 1.16 24445256.776 20.625 20.6 15
143313 MS Ser G8V/K2IV 2 1.0/3.5 [0.58/0.79] 0.94/1.23 2442616.142 9.01490 9.60 7/15
Ref. Stars                    
62509 $\beta $ Gem K0III                
29139 $\alpha $ Tau K5III                
45410 6 Lyn K0III-IV                
124897 $\alpha $ Boo K1III                
3651 54 Psc K0V                
32147 HR 1614 K5V                


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