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| Query : 2007A&A...474..165K |
2007A&A...474..165K - Astronomy and Astrophysics, volume 474165-168 (2007/10-4)
Anti-solar differential rotation on the active K-giant σ Geminorum.
KHOVARI Z., BARTUS J., STRASSMEIER K.G., VIDA K., SVANDA M. and OLAH K.
Abstract (from CDS):
The active K1 giant σ Gem and its differential surface rotation is revisited. We refine our previous inconclusive result by recovering the spot migration pattern of this long-period RSCVn-type binary through application of the technique of ``average cross-correlation of contiguous Doppler images'' to a set of six Doppler images from 3.6 consecutive rotation cycles. We find an anti-solar differential rotation law with a shear of α≃-0.022±0.006. We also find evidence of a poleward migration trend of spots with an average velocity of ≃300m/s.
Abstract Copyright: ∼
Journal keyword(s): stars: activity - stars: imaging - stars: late-type - stars: starspots - stars: individual: σ Geminorum
Simbad objects: 12
| Number of rows : 12 |
| 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 | * zet And | El* | 00 47 20.3257188471 | +24 16 01.842781713 | 6.05 | 5.18 | 4.06 | 3.21 | 2.62 | K1III+KV | 299 | 0 |
| 2 | HD 22468 | RS* | 03 36 47.2904292073 | +00 35 15.943692002 | 7.09 | 6.79 | 5.90 | K2:Vnk | 1206 | 0 | ||
| 3 | V* V1192 Ori | RS* | 05 00 08.2195942104 | +03 17 12.024920724 | 8.75 | 7.503 | 6.223 | K1/2III | 89 | 0 | ||
| 4 | V* AB Dor | TT* | 05 28 44.8712165880 | -65 26 55.199147208 | 8.259 | 7.856 | 6.999 | 6.496 | 5.993 | K0V | 1080 | 0 |
| 5 | * sig Gem | RS* | 07 43 18.7276907303 | +28 53 00.631838445 | 6.38 | 5.41 | 4.29 | 3.37 | 2.79 | K1IIIe | 499 | 0 |
| 6 | V* IL Hya | RS* | 09 24 49.0136973144 | -23 49 34.714396272 | 8.38 | 7.37 | K2IV/Vp | 176 | 0 | |||
| 7 | V* LQ Hya | BY* | 09 32 25.5683895648 | -11 11 04.692242760 | 9.316 | 8.761 | 7.891 | 7.288 | 6.815 | K1Vp | 480 | 0 |
| 8 | V* UZ Lib | SB* | 15 32 23.2091053080 | -08 32 00.933064764 | 10.12 | 9.115 | 7.904 | K0III | 124 | 1 | ||
| 9 | V* V2075 Cyg | RS* | 21 55 14.4582205776 | +44 25 06.904799760 | 8.56 | 7.49 | G8III | 51 | 0 | |||
| 10 | V* HK Lac | RS* | 22 04 56.6083608840 | +47 14 04.479131004 | 8.01 | 6.96 | K0III | 250 | 0 | |||
| 11 | V* IM Peg | RS* | 22 53 02.2663977960 | +16 50 28.300547040 | 7.024 | 5.890 | K2III | 357 | 1 | |||
| 12 | V* KU Peg | RS* | 23 05 29.2735048704 | +26 00 33.459393312 | 8.79 | 7.66 | G9IV(e) | 66 | 0 |
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