RS CVn stars & chromospherically active binaries

RS CVn are class of detached binary typically composed of a chromospherically active G or K stars. The system generally rotate fast with typical orbital period from a few days to 20 days. Tidal forces between the close components have locked  their rotational periods to the orbital period. The RS CVn binaries display a high level of activity with strong chromospheric line emissions. One of the striking aspects of these systems is their propensity to flare. These stars shows rotational modulation of photospheric spots.and are also magnetically active (Doppler Imaging and Zeeman Doppler Imaging are classical technique used for map stellar surfaces of the RS CVn components).

We have added spectroscopic binary systems with at least one component shows Ca II IH and K emission (from Strassmeier, A&AS, 100, 173-225 (1993)).

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     HD       Star           R.A.        Dec.    Spec.         V      Period (d)     H&K             Ha                                  Type

    28    33 Psc        00 h 05.3   -05 42    K0III        4.61     72.93        weak         absorption      RS CVn
   352    5 Cet         00 h 08.2   -02 27    K1III        6.07     96.439       strong          -            Beta Lyr
  3196    13 Cet A      00 h 35.3   -03 35    F7V+G4V      5.20     2.08200      moderate     absorption      RS CVn
  4502    Zeta And      00 h 47.3    24 16    K1III        4.06     17.7692      strong       absorption      Beta Lyr
 13480    6 Tri         02 h 12.4    30 18    F5+K0III     4.94     14.7339      moderate     absorption      RS CVn 

 17433    VY Ari        02 h 48.7    31 07    K3V          6.92     13.178       strong       filled          RS CVn
 21242    UX Ari        03 h 26.6    28 43    K0IV+G5V     6.38     6.43791      weak/strong  emission        RS CVn
 22468    HR1099        03 h 36.8    00 35    K1IV+G5V     5.64     2.83774      strong       emission        RS CVn
 29317    3 Cam         04 h 39.9    53 05    K0III        5.05     121          weak            -            Cepheid
 34029    Alpha Aur     05 h 16.7    46 00    G1III+K0III  0.08     104.0214     yes          absorption      RS CVn

 37171    HR1908        05 h 37.1    11 02    K4III        5.94       -          moderate     weak              -
 39743    HR2054        05 h 57.1    49 02    G8III        6.47     83.19        yes             -              -
 45088    OU Gem        06 h 26.2    18 45    K3V+K5V      6.79     6.991868     strong       emission        DY Dra
 62044    Sigma Gem     07 h 43.3    28 53    K1III        4.14     19.60447     strong       filled          RS CVn
 65626    54 Cam        08 h 02.6    57 16    F9IV+G5IV    6.50     11.06803     moderate     moderate        RS CVn

 98230    Xi UMa        11 h 18.2    31 32    G5V          4.87     3.9805       strong       absorption        -
102509    93 Leo        11 h 48.0    20 13    A6V+G5IV     4.50     71.6900      weak         moderate abs.   RS CVn
106677    HR4665        12 h 15.7    72 33    K1III+K1III  6.14     64.44        strong       absorption      RS CVn
118216    HR5110        13 h 34.8    37 11    F2IV+K2IV    4.93     2.61321      yes          filled          RS CVn
131511    HR5553        14 h 53.4    19 09    K2V          5.97     125.369      moderate     moderate          -

146361    Sigma2 CrB    16 h 14.7    33 52    F6V+G0V      5.70     1.13979      strong       filled          RS CVn 
153751    Epsilon UMi   16 h 46.0    82 02    F0V+G5III    4.23     39.4809      moderate     absorption      RS CVn
157482    HR6469        17 h 21.7    39 58    F2V+G5IV     5.51     2018         strong       filled          Algol
160538    29 Dra        17 h 32.7    74 14    K0III        6.55     905.9        strong       filled          RS CVn
161832    HR6626        17 h 46.0    39 19    K3III        6.68     99.557       weak           -             RS CVn

184398    HR7428        19 h 31.2    55 44    K2III        6.32     108.854      strong       emission        RS CVn
188088    HR7578        19 h 54.3   -23 56    K2V+K2V      6.16     46.817       strong         -             BY Dra
203454    HR8170        21 h 21.0    40 20    K8V+K5V      6.40     3.24335      yes            -               -
206301    42 Cap        21 h 41.5   -14 03    G2IV         5.17     13.1740      yes          absorption      RS CVn
209813    HK Lac        22 h 04.9    47 14    F1V+K0III    6.52     24.4284      yes          emission        RS CVn

210334    AR Lac        22 h 08.7    45 45    G2IV+K0IV    6.09     1.98322      strong       emission        RS CVn
213389    V350 Lac      22 h 30.2    49 21    K2III        6.38     17.755       moderate     absorption      RS CVn
216489    IM Peg        22 h 53.0    16 50    K2II         5.60     24.65        weak         filled          RS CVn
222107    Lambda And    23 h 37.6    46 27    G8IV         3.70     20.5212      yes          filled          RS CVn
224085    II Peg        23 h 55.1    28 38    K2V          7.20     6.72418      strong       emission        RS CVn


 
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