1999A&AS..137..217Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST06:18:14

1999A&AS..137..217Z - Astron. Astrophys., Suppl. Ser., 137, 217-221 (1999/June-1)

Photometry and spectroscopy of the RS CVn system σ Geminorum.

ZHANG X.B. and ZHANG R.X.

Abstract (from CDS):

We present new UBV photoelectric photometry and high-resolution Hα spectroscopy of the RS CVn system σ Gem made in 1993-1994. A brief photometric analysis for the new light curves is carried out using the Wilson-Devinney method with spot approximation based on the Roche model. The result suggests the probable presence of two cool spots on the K1 III primary around the phases of φ=0.6 and φ=0.9. The spot activity is discussed in connection with the chromospheric Hα emission. The enhanced Hα core emission is found to vary with phase and shows distinct anti-correlation with the spot regions. It may be an indication for the existence of plage regions on σ Gem.

Abstract Copyright:

Journal keyword(s): stars: individual: σ Gem - activity - binaries: close

Status at CDS:  

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 661 0
2 * sig Gem RS* 07 43 18.7269793 +28 53 00.642191 6.38 5.41 4.29 3.37 2.79 K1IIIe 444 0
3 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 683 0
4 V* Z Her RS* 17 58 06.9787072966 +15 08 21.909354791   7.86 7.30     F8V 268 0

    Equat.    Gal    SGal    Ecl

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2020.05.26-06:18:14

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