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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