observation simulation - astro.up.pt fileobservation simulation log(r’ hk) = -4.9 log(r’ hk) =...

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Observation Simulation Log(R’ HK ) = -4.9 Log(R’ HK ) = -4.8 Number of spots per hemisphere 75 150 Latitude of spots [°] 22.5 ± 2 15 ± 2 Longitude of spots [°] Active longitudes in the north [°] Active longitudes in the south [°] Rotation of the star Lifetime of spot groups Presence of giant spot groups - 1 with a lifetime between 2 and 6 months Maximum filling factor of spot groups Increasing phase of spot groups Decreasing phase of spot groups 0 ± 15, 180 ± 15 (and sometimes 90 or 270 ±15) 90 ± 15, 270 ± 15 (and sometimes 0 or 180 ±15) spots on 4 to 6 active longitudes (number selected randomly) differential rotation, 26 days on the equator 50 % between 1h and 2 days, 40 % between 2 and 11 days, 10 % between 11 days and 2 months. 10 -5 lifetime 1/3 of the lifetime 2/3 of the lifetime

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Page 1: Observation Simulation - astro.up.pt fileObservation Simulation Log(R’ HK) = -4.9 Log(R’ HK) = -4.8 Number of spots per hemisphere 75 150 Latitude of spots [°] 22.5 ± 2 15 ±

Observation Simulation

Log(R’HK) = -4.9 Log(R’HK) = -4.8Number of spots per hemisphere 75 150Latitude of spots [°] 22.5 ± 2 15 ± 2Longitude of spots [°]Active longitudes in the north [°]Active longitudes in the south [°]Rotation of the star

Lifetime of spot groups

Presence of giant spot groups - 1 with a lifetime between 2 and 6 months

Maximum filling factor of spot groupsIncreasing phase of spot groupsDecreasing phase of spot groups

0 ± 15, 180 ± 15 (and sometimes 90 or 270 ±15)90 ± 15, 270 ± 15 (and sometimes 0 or 180 ±15)

spots on 4 to 6 active longitudes (number selected randomly)

differential rotation, 26 days on the equator50 % between 1h and 2 days, 40 % between 2 and 11 days,

10 % between 11 days and 2 months.

10-5 lifetime1/3 of the lifetime2/3 of the lifetime