2001A&A...371..652B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST11:27:57

2001A&A...371..652B - Astronomy and Astrophysics, volume 371, 652-666 (2001/5-4)

The effect of stellar activity on the LiI 6708, NaI 5896 and KI 7699 Å lines. A comparison with the Pleiades, field stars and the Sun.

BARRADO Y NAVASCUES D., GARCIA LOPEZ R.J., SEVERINO G. and GOMEZ M.T.

Abstract (from CDS):

An analytical model has been developed to empirically study the effects of stellar spots and faculae on the observed equivalent widths of LiI 6708, NaI 5896 and KI 7699Å lines (and abundances in the case of lithium) in late-type stars, taking into account the changes in the observed magnitudes and colors. Solar spectra corresponding to different active regions are used as input data and a range of filling factors are applied to simulate the surfaces of stars with different levels of activity. Detailed comparisons between predicted and observed photometric colors and equivalent widths are made for late-type stars of the Pleiades and the field. The observed dispersions in KI and LiI equivalent widths for Pleiades stars can be partially accounted by the simultaneous effects of activity on colors and the line formation, indicating that the lithium-rotation connection suggested for ∼0.7-0.9M Pleiades stars could be due in part to the stellar activity. However, under realistic values for the filling factors, only a small portion of the observed spread could be explained by these effects.

Abstract Copyright:

Journal keyword(s): Sun: activity - Sun: faculae, plages - sunspots - stars: abundances - stars: activity - stars: late type

Simbad objects: 6

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Number of rows : 6

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* CF Tuc RS* 00 53 07.7682099536 -74 39 05.609032263   8.31 7.90   6.730 G2/5V+F0 217 0
2 V* BE Psc RS* 01 04 07.1519262541 +26 35 13.282929403   9.20 8.198   7.030 G5V 38 0
3 * 39 Cet RS* 01 16 36.2882494986 -02 30 01.329588503   6.310 5.428     G6III:eFe-2 245 0
4 V* CC Eri BY* 02 34 22.5662436236 -43 47 46.871752741 11.305 10.201 8.865 7.926 6.992 K7V 250 0
5 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 665 0
6 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3024 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-11:27:58

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