2005A&A...441..701V


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.07CEST17:44:13

2005A&A...441..701V - Astronomy and Astrophysics, volume 441, 701-709 (2005/10-2)

Chromospheric models of solar analogues with different activity levels.

VIEYTES M., MAUAS P. and CINCUNEGUI C.

Abstract (from CDS):

We computed chromospheric models of the Sun as a star and of nine solar analogues. The atmospheric models were constructed to obtain the best possible match with the Ca II K and Hβ lines, including the asymmetry of the lines due to macroscopic velocity fields. The stars were chosen with 0.62<B-V<0.68 (the solar B-V=0.65) and have a wide variety of magnetic activity levels, which allows us to study the differences in atmospheric structures induced by activity. For the less active stars we found that the changes with activity are in the region of the temperature minimum, while the most active stars show changes all along their atmospheric structures, mainly in the upper chromosphere. Regarding the macroscopic velocity fields, we can distinguish between the two groups. The most active group has a velocity field in the temperature-minimum region, and the other group in the chromospheric plateau. We also computed the net radiative losses for each model, and found that they depend linearly on the usual index of chromospheric activity, SCaII.

Abstract Copyright:

Journal keyword(s): radiative transfer - stars: atmospheres - stars: activity

Simbad objects: 13

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Number of rows : 13

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 * 9 Cet BY* 00 22 51.7883318927 -12 12 33.972374893 7.29 7.05 6.39     G2.5V 452 0
2 HD 19467 PM* 03 07 18.5750358835 -13 45 42.419198459   7.65 7.00 7.79 8.82 G3V 121 0
3 * zet01 Ret PM* 03 17 46.1632605674 -62 34 31.154247481 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 269 0
4 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1704 1
5 * 58 Eri BY* 04 47 36.2917607568 -16 56 04.041927355   6.14 5.50     G2.5IV-V 384 0
6 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1152 0
7 CD-40 9712 PM* 15 32 12.9326267337 -41 16 32.131578815 11.918 10.815 9.311 8.265 6.947 M2.5V 111 0
8 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 485 0
9 BD-12 4523 BY* 16 30 18.0582010683 -12 39 45.323235188 12.829 11.638 10.072 8.917 7.421 M3V 257 0
10 HD 172051 ** 18 38 53.4015065712 -21 03 06.741519593   6.518 5.860     G6V 170 1
11 HD 189567 PM* 20 05 32.7652367983 -67 19 15.228862402 6.79 6.71 6.07     G2V 196 1
12 HD 197076 PM* 20 40 45.1407864181 +19 56 07.928511642 7.14 7.06 6.44 5.95 5.61 G5V 220 0
13 HD 202917 Ro* 21 20 49.9575453387 -53 02 03.157635940   9.32 8.67   7.882 G7V 137 0

    Equat.    Gal    SGal    Ecl

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2020.08.07-17:44:13

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