1996A&A...305..498A

Query : 1996A&A...305..498A

1996A&A...305..498A - Astronomy and Astrophysics, volume 305498-506 (1996/1-2)

Rotational periods and starspot activity of young solar-type dwarfs in the open cluster IC 4665.

ALLAIN S., BOUVIER J., PROSSER C., MARSCHALL L.A. and LAAKSONEN B.D.

Abstract (from CDS):

We present the results of a V-band photometric monitoring survey of 15 late-type dwarfs in the young open cluster IC 4665. Low-amplitude periodic light variations are found for 8 stars and ascribed to the modulation by starspots that cover typically a few percent of the stellar disk. Periods range from 0.6 to 3.7d, translating to equatorial velocities between 13 and 93km/s. That no period longer than 4d was detected suggests a relative paucity of extremely slow rotators (Veq≪10km/s) among late-type dwarfs in IC4665. The fractional number of slow rotators in IC 4665 is similar to that of Alpha Per cluster, suggesting that IC 4665 is close in age to Alpha Per (∼50Myr).

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: late-type - stars: rotation - open clusters: individual: IC 4665

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
4 IC 4665 37 * 17 44 48.3712131984 +05 25 30.375191172   11.91 11.36     F0 33 0
5 V* V2316 Oph BY* 17 45 19.3988522256 +05 47 40.119087444   14.60 13.716   12.696 G6 49 0
6 V* V2317 Oph BY* 17 45 19.6432303334 +05 36 54.755808550   13.49 12.729   11.711 G0 34 0
7 V* V2318 Oph BY* 17 45 25.0724676027 +05 51 38.870504059   14.39 13.716   12.697 G5 48 0
8 Cl* IC 4665 P 19 * 17 45 36.9271384088 +05 42 42.432986084   12.59 11.927   11.137 F8V 36 0
9 IC 4665 53 * 17 45 41.2380392880 +05 33 44.377719192   11.93 11.41   10.767 G5 29 0
10 Cl* IC 4665 P 94 * 17 45 53.0949964392 +05 36 29.204755884   14.27 14.243   13.149 G8 40 0
11 V* V2319 Oph BY* 17 45 56.7967605336 +05 22 33.440795652   13.417 12.604 12.442 11.682 G0 35 0
12 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
13 V* V2321 Oph BY* 17 46 11.9798853179 +05 41 25.876171084   15.43 14.407   13.074 K0 45 0
14 Cl* IC 4665 P 107 * 17 46 24.7223108568 +05 17 21.379412328   13.78 12.921   11.870 G1 42 0
15 V* V2299 Oph Ro* 17 46 25.7092521240 +05 31 09.084906984   13.16 12.342   11.351 F7 27 0
16 V* V2322 Oph BY* 17 46 26.0911413496 +05 49 42.317168720   13.68       F9 32 0
17 Cl* IC 4665 P 146 * 17 47 30.0358417488 +05 31 36.517254996   15.31 14.204   12.986 K0 16 0
18 V* V2325 Oph BY* 17 47 33.3157647552 +05 31 46.026952428   13.94 13.126   12.107 G4 45 0
19 V* V2326 Oph BY* 17 47 44.0281203687 +05 21 59.234653509   14.43       G5 41 0

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