2003A&A...397.1151S


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET17:30:41

2003A&A...397.1151S - Astronomy and Astrophysics, volume 397, 1151-1159 (2003/1-3)

Precise radial velocity measurements of G and K giants. First results.

SETIAWAN J., PASQUINI L., DA SILVA L., VON DER LUEHE O. and HATZES A.

Abstract (from CDS):

We present the first results of our precise radial velocity (RV) measurements of G and K giants. A number of stars from our list of 80 targets have been observed for 14 months using the fibre-fed echelle spectrograph FEROS at the 1.52 m ESO telescope in La Silla, Chile. This sample increases the number of giants surveyed with precise stellar radial velocity measurements at least by a factor of 10. During this period we are able to estimate the long-term accuracy of our measurement as better than 11m/s. We use the simultaneous Th-Ar calibration and cross-correlation technique to compute the radial velocity by applying a numerical template for K-type stars. Standard deviation σ of mean radial velocity variations between 3m/s and 4km/s with timescales between several days and years are measured for 21 of G and K giants which are presented in this paper. Fifteen stars show definite variability above 3σ of our measurement uncertainties. Two stars with RV variations above 800m/s are tentatively identified as new binaries. Although definitive trends between RV variations and stellar evolutionary status cannot yet be established, all the luminous cool giants of our sample seem to have significant radial velocity variations, while those stars in the giant's clump region can be either variable or constant.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: variables: general - techniques: radial velocities

Simbad objects: 30

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Number of rows : 30

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 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1115 1
2 * eta02 Hyi PM* 01 54 56.1320498641 -67 38 50.294625663   5.623 4.685     G8IIIb 94 1
3 * pi. For PM* 02 01 14.7226685359 -30 00 06.585108110   6.23 5.35     G8III 60 0
4 HD 16147 * 02 34 14.7807994123 -42 18 14.091333195   11.10 9.55     M1/2(III) 4 0
5 * lam02 For PM* 02 36 58.6079324808 -34 34 40.713450652 6.67 6.45 5.79     G1V 183 1
6 * eta Eri PM* 02 56 25.6494839 -08 53 53.322099 5.97 4.99 3.87 3.08 2.50 K1+IIIb 181 0
7 * eps For PM* 03 01 37.6304831834 -28 05 29.376723799   6.68 5.85     G9:V 164 0
8 HD 18885 * 03 01 56.1189723705 -09 57 41.050973426   6.939 5.837     K1III 42 0
9 * y Eri * 03 37 05.6791528245 -40 16 28.740766703 6.39 5.62 4.58 3.74 3.17 K1III 56 0
10 * alf Ret PM* 04 14 25.4841381 -62 28 25.891671 4.90 4.27 3.36 2.71 2.27 G8IIIa: 108 0
11 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1192 1
12 * eps Lep PM* 05 05 27.6653698 -22 22 15.723893 6.41 4.64 3.18 2.08 1.27 K4III 144 0
13 * omi Col PM* 05 17 29.0892938 -34 53 42.744408 6.62 5.83 4.83 4.09 3.54 K1IV 80 0
14 * lam Dor * 05 26 19.2666877189 -58 54 45.067948687   6.107 5.129     G8III 38 0
15 HD 36462 * 05 30 32.8073583080 -28 46 50.643484708   9.77 8.80     G5III 9 0
16 HD 36848 * 05 32 51.4129167133 -38 30 48.119001540   6.687 5.456     K2/3III 29 0
17 * ksi Col * 05 55 29.9103830063 -37 07 14.323188918   6.058 4.961     K1IIICNII 30 0
18 * tet CMa PM* 06 54 11.3997692336 -12 02 19.061054441 7.20 5.51 4.08 2.95 2.17 K3/4III 209 0
19 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1059 1
20 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2085 0
21 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 410 0
22 * eps Cru PM* 12 21 21.6093625 -60 24 04.129070   5.01 3.59     K3III 84 0
23 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2165 0
24 * zet02 Sco PM* 16 54 35.0043467 -42 21 40.740679   4.99 3.62     K3III 70 0
25 * pi. Her V* 17 15 02.8343634 +36 48 32.984340 6.28 4.61 3.18 2.22 1.49 K3II 230 0
26 * bet Oph PM* 17 43 28.3526482 +04 34 02.295484 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 456 0
27 * 71 Oph * 18 07 18.3588843509 +08 44 01.918091638   5.592 4.640     G8III 165 0
28 * eta Sct PM* 18 57 03.6702664576 -05 50 46.730466051   5.904 4.818     K1-III 94 0
29 HD 179799 PM* 19 14 16.0186701874 -08 43 08.675830464   7.53 6.54     K4III 24 0
30 * 27 Psc ** 23 58 40.3770768 -03 33 21.537918   5.814 4.886     G8III 98 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-17:30:41

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