2006A&A...454..301F


Query : 2006A&A...454..301F

2006A&A...454..301F - Astronomy and Astrophysics, volume 454, 301-309 (2006/7-4)

Newly discovered active binaries in the RasTyc sample of stellar X-ray sources. I. Orbital and physical parameters of six new binaries.

FRASCA A., GUILLOUT P., MARILLI E., FREIRE FERRERO R., BIAZZO K. and KLUTSCH A.

Abstract (from CDS):

We present the first results from follow-up optical observations, both photometric and spectroscopic, of stellar X-ray sources, selected from the RasTyc sample, resulting from the cross-correlation of ROSAT All-Sky Survey (RASS) and TYCHO catalogues. In particular, we report on the discovery of six late-type binaries, for which we obtained good radial velocity curves and solved their orbits. We performed an automatic spectral classification of both single-lined and double-lined binaries with codes developed by us and found two binaries composed of two main-sequence stars and four binaries with an evolved (giant or subgiant) component. Filled-in or pure emission Hα profiles indicative of a moderate or high level of chromospheric activity were observed. In nearly all the systems, we also detected a photometric modulation ascribable to surface inhomogeneities that is correlated with the orbital period, suggesting a synchronization between rotational and orbital periods. The position on the HR diagram of the components of the five sources with a known parallax indicates three binaries containing only main-sequence stars and two single-lined systems with a giant component. The kinematical properties of two, or possibly four, of the observed systems are consistent with a young disk population.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars: fundamental parameters - stars: late-type - stars: activity - stars: kinematics - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/454/301): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat tables.tex>

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 166 BY* 00 06 36.7840068588 +29 01 17.412693890   6.88   5.6   G8 334 1
2 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 528 0
3 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 615 1
4 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.79 5.90 5.4   K2:Vnk 1147 0
5 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3207 0
6 V* DF Cam SB* 04 05 42.3366475272 +57 07 37.042517244   10.15 9.07     K2IIIe 17 0
7 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2860 0
8 HD 32147 PM* 05 00 48.9993452248 -05 45 13.224327192 8.27 7.27 6.21 5.36 4.87 K3+V 432 1
9 HD 57267 Ro* 07 21 32.8157970960 +26 09 33.244881732   8.40 7.510   6.475 G5III+A: 22 0
10 V* AD LMi RS* 10 26 22.7557849584 +37 45 12.910427424   10.63 9.58 9.411   K2 10 0
11 V* DM UMa RS* 10 55 43.5438405648 +60 28 09.721480656   10.31 9.29     K0III-IV 162 0
12 NAME UMa Region reg 11 00 +50.0           ~ 322 0
13 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 701 0
14 * del Boo PM* 15 15 30.1629518 +33 18 53.392558 5.12 4.44 3.49 2.76 2.25 G8IIIFe-1 368 0
15 * 70 Oph ** 18 05 27.28518 +02 30 00.3558 5.40 4.89 4.03 3.38 2.92 K0-V 629 0
16 HD 183957 SB* 19 31 37.0277643312 +11 43 26.006530368   9.05 8.21     K0 7 0
17 * sig Dra PM* 19 32 21.5902098601 +69 39 40.235805206 5.860 5.460 4.680 4.04 3.63 K0V 602 0
18 V* OT Peg PM* 21 59 40.1160339696 +16 02 17.981956860   10.55 9.74     K0 13 0
19 V* HK Lac RS* 22 04 56.6083608840 +47 14 04.479131004   8.01 6.96     K0III 234 0
20 BD+33 4462 SB* 22 14 28.2941434488 +33 56 29.673922596   9.66 8.95     G0 10 0
21 * gam Cep SB* 23 39 20.9104133784 +77 37 56.510781384 5.190 4.250   2.6   K1III-IVCN1 575 1
22 NAME Gould Belt PoG ~ ~           ~ 806 1

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2022.08.09-04:39:39

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