2003A&A...408..337C


Query : 2003A&A...408..337C

2003A&A...408..337C - Astronomy and Astrophysics, volume 408, 337-345 (2003/9-2)

A study of the MgII 2796.34 Å emission line in late-type normal and RS CVn stars.

CARDINI D., CASSATELLA A., BADIALI M., ALTAMORE A. and FERNANDEZ-FIGUEROA M.J.

Abstract (from CDS):

We carry out an analysis of the MgII 2796.34Å emission line in RS CVn stars and make a comparison with the normal stars studied in a previous paper (Paper I). The sample of RS CVn stars consists of 34 objects with known HIPPARCOS parallaxes and observed at high resolution with IUE. We confirm that RS CVn stars tend to possess wider MgII lines than normal stars having the same absolute visual magnitude. However, we could not find any correlation between the logarithmic line width log Wo and the absolute visual magnitude MV (the Wilson-Bappu relationship) for these active stars, contrary to the case of normal stars addressed in Paper I. On the contrary, we find that a strong correlation exists in the (MV, log LMgII) plane (LMgII is the absolute flux in the line). In this plane, normal and RS CVn stars are distributed along two nearly parallel straight lines with RS CVn stars being systematically brighter by ≃1dex. Such a diagram provides an interesting tool to discriminate active from normal stars. We finally analyse the distribution of RS CVn and of normal stars in the (log LMgII, log Wo) plane, and find a strong linear correlation for normal stars, which can be used for distance determinations.

Abstract Copyright:

Journal keyword(s): stars: distances - stars: late-type - stars: individual: RS CVn - ultraviolet: stars - line: profiles

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* CF Tuc RS* 00 53 07.7682099536 -74 39 05.609032263   8.31 7.90   6.730 G2/5V+F0 222 0
2 V* XX Tri RS* 02 03 47.1138016857 +35 35 28.669244792   9.52 8.42     K0III 121 0
3 * iot Tri ** 02 12 22.28003 +30 18 11.0430 6.048 5.741 4.952     G0III+G5III 185 0
4 V* VY Ari RS* 02 48 43.7283572894 +31 06 54.592580835   7.72   6.4   G9 211 0
5 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 668 0
6 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1137 0
7 V* EI Eri RS* 04 09 40.8929265498 -07 53 34.177328732   7.71 7.04     G3V 272 0
8 * 12 Cam RS* 05 06 12.1360892121 +59 01 16.826053743 8.110 7.260 6.130     K0IIIe 160 0
9 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1150 0
10 V* AR Mon RS* 07 20 48.4540808090 -05 15 35.799308532   9.84 8.79   7.608 G6IV 163 0
11 * sig Gem RS* 07 43 18.7269793 +28 53 00.642191 6.38 5.41 4.29 3.37 2.79 K1IIIe 454 0
12 V* IL Hya RS* 09 24 49.0137313673 -23 49 34.713618005   8.38 7.37     K2IV/Vp 163 0
13 V* V829 Cen RS* 11 39 22.2370700924 -39 23 07.597273825   8.77 7.84   6.588 G8IV 63 0
14 V* HU Vir RS* 12 13 20.6903303051 -09 04 46.844857323   9.69 8.71   7.639 K1V 139 0
15 V* DK Dra RS* 12 15 41.4913707788 +72 33 04.305716292   7.43 6.30     K0+IIICH-1 164 0
16 V* RS CVn RS* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 692 0
17 V* BM CVn RS* 13 21 32.2611024581 +38 52 49.518149269   8.56 7.36     K2III 80 0
18 V* WW Dra RS* 16 39 03.9798563875 +60 41 58.777764456   9.34 8.61     G5Vn 184 0
19 * eps UMi RS* 16 45 58.2360423451 +82 02 14.146856704   5.109 4.212     G5III 200 0
20 HD 155555 RS* 17 17 25.5047544575 -66 57 03.732827572 7.795 7.499 6.723   6.39 K1Vp 257 2
21 * 29 Dra RS* 17 32 41.2393174947 +74 13 38.344793256   7.691 6.627     K0+DA1.5 150 0
22 V* Z Her RS* 17 58 06.9787072966 +15 08 21.909354791   7.86 7.30     F8V 275 0
23 V* V815 Her RS* 18 08 16.0466708534 +29 41 28.298657106   8.40 7.70     G5 134 0
24 V* V1762 Cyg RS* 19 08 25.7904391348 +52 25 32.630339536   6.982 5.893     K1IV 199 0
25 V* V4138 Sgr RS* 19 22 40.3013954097 -20 38 34.475766249   7.76 6.74     K2IIICNVp 80 0
26 V* V1817 Cyg RS* 19 31 13.5555646958 +55 43 54.606371185   7.489 6.369     K2II-III+A0V 145 0
27 V* V1764 Cyg RS* 19 36 42.5795363068 +27 53 02.889819091   8.99 7.78     K1III: 83 0
28 V* HK Lac RS* 22 04 56.6089126762 +47 14 04.482220545   8.01 6.96     K0III 233 0
29 V* AR Lac RS* 22 08 40.8180372773 +45 44 32.104045703 7.09 6.83 6.11     K0IVe+G5IV 701 0
30 V* V350 Lac RS* 22 30 06.5032506020 +49 21 23.088971391   7.59 6.42     K2III 129 0
31 V* IM Peg RS* 22 53 02.2658951462 +16 50 28.291474642   7.024 5.890     K2III 322 1
32 V* SZ Psc RS* 23 13 23.7750023418 +02 40 31.587196900   8.19 7.44   6.390 G5Vp 308 1
33 * lam And RS* 23 37 33.8426114 +46 27 29.337984 5.54 4.84 3.82 3.04 2.47 G8IVk 648 0
34 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 692 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-04:47:33

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