2004A&A...426.1007M


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST16:07:04

2004A&A...426.1007M - Astronomy and Astrophysics, volume 426, 1007-1020 (2004/11-2)

The photospheric abundances of active binaries. III. Abundance peculiarities at high activity levels.

MOREL T., MICELA G., FAVATA F. and KATZ D.

Abstract (from CDS):

We report the determination from high-resolution spectra of the atmospheric parameters and abundances of 13 chemical species (among which lithium) in 8 single-lined active binaries. These data are combined with our previous results for 6 other RS CVn systems to examine a possible relationship between the photospheric abundance patterns and the stellar activity level. The stars analyzed are generally found to exhibit peculiar abundance ratios compared to inactive, Galactic disk stars of similar metallicities. We argue that this behaviour is unlikely to be an artefact of errors in the determination of the atmospheric parameters or non-standard mixing processes along the red giant branch, but diagnoses instead the combined action of various physical processes related to activity. The most promising candidates are cool spot groups covering a very substantial fraction of the stellar photosphere or NLTE effects arising from nonthermal excitation. However, we cannot exclude the possibility that more general shortcomings in our understanding of K-type stars (e.g. inadequacies in the atmospheric models) also play a significant role. Lastly, we call attention to the unreliability of the (V-R) and (V-I) colour indices as temperature indicators in chromospherically active stars.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - stars: abundances - stars: activity - line: formation

VizieR on-line data: <Available at CDS (J/A+A/426/1007): tablea1.dat>

Status at CDS:  

Simbad objects: 21

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Number of rows : 21

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 * 33 Psc RS* 00 05 20.14193 -05 42 27.4279 6.52 5.65 4.61 3.83 3.29 K0III-IV 199 0
2 * 36 Psc ** 00 16 34.0414650364 +08 14 24.552183049   7.042 6.121     G8II-III 50 1
3 * 58 Psc SB* 00 47 01.4510937908 +11 58 25.810680267   6.489 5.504     G8II 57 0
4 V* UV For RS* 01 46 41.6469419906 -24 00 50.309405574   9.05 8.064   7.022 K0IV 54 0
5 HD 17006 PM* 02 42 08.4438019607 -46 31 27.989431339   6.985 6.094     K1III 43 0
6 V* EL Eri RS* 03 10 38.5120762866 -05 23 38.020558422   9.29 8.19   6.746 K0III 55 0
7 V* VX Pyx RS* 08 32 58.5003063293 -34 38 02.531738157   7.318 6.366     G8III 69 0
8 V* IN Vel RS* 09 37 12.9607533108 -42 01 14.494955478   10.26 9.08   7.767 K2IIIp 56 0
9 V* IS Vir RS* 13 06 26.0086694996 -04 50 45.301471255   9.50 8.432   7.175 K0III 46 1
10 V* V764 Cen RS* 13 36 08.3189073523 -33 28 44.816874991   10.28 8.912   7.612 K3III 38 0
11 V* V851 Cen RS* 13 44 00.9207917868 -61 21 59.167786170   8.74 7.798   6.638 K0III 74 0
12 HD 154619 * 17 06 13.0483963796 +10 27 13.956592225 7.840 7.270 6.380     G8III-IV 25 0
13 * 41 Oph ** 17 16 36.6865252317 -00 26 43.091489225       6.27   K2III 78 0
14 V* V4138 Sgr RS* 19 22 40.3013954097 -20 38 34.475766249   7.76 6.74     K2IIICNVp 76 0
15 V* V4139 Sgr RS* 19 28 05.5716597760 -40 50 04.975362327   9.61 8.445   7.134 K2/3III 40 0
16 V* BN Mic RS* 21 14 52.7024712987 -31 11 01.262643613   8.87 7.76   6.662 K1IIIp 46 0
17 V* BH Ind RS* 21 28 19.8820063619 -52 49 14.560495441   10.16 9.12   7.723 K1IIICNIVp 39 0
18 V* AS Cap RS* 21 34 16.5717888056 -13 29 01.504462407   8.75 7.69   6.658 K0IIIp 66 0
19 * tet Aqr PM* 22 16 50.0363539 -07 46 59.848035 5.95 5.15 4.16 3.46 2.98 G9II 134 0
20 V* AZ Psc RS* 22 58 52.9208449013 -00 18 57.379291757   8.44       K0III 47 0
21 * 5 Psc PM* 23 08 40.9095327701 +02 07 40.355833093       4.9   G6IIIb 84 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-16:07:04

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