2004A&A...425..171Y


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET23:41:18

2004A&A...425..171Y - Astronomy and Astrophysics, volume 425, 171-177 (2004/10-1)

HD 153720 - A SB2 system with twin metallic-line components.

YUSHCHENKO A.V., GOPKA V.F., KHOKHLOVA V.L., LAMBERT D.L., KIM C. and KANG Y.W.

Abstract (from CDS):

We report the results of abundance determinations for the components of the SB2 star HD 153720 from high resolution (R=60000) echelle high signal-to-noise spectra of the wavelength region 3595-10260Å taken with the 2.7m telescope of the McDonald Observatory We found the values of the atmospheric parameters of the primary to be effective temperature Teff=7425K and surface gravity logg=4.0cgs, and of the secondary to be Teff=7125K and logg=3.9cgs. The microturbulent velocity is vmicro=2.7km/s for both components, and the projected rotational velocity is vsini=15km/s also for both components. The abundances of about 20 elements were determined with the method of spectrum synthesis. The components of HD 153720 are metallic-line stars. Possible inconsistencies between old and new measurements of radial velocities may be explained by the existence of third body in this system. A review of recent high resolution spectral observations of eight A4-F1 binaries shows that only one of these systems can be classified as normal.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: evolution - stars: chemically peculiar - stars: binaries: spectroscopic - stars: individual: HD 153720

Simbad objects: 11

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Number of rows : 11

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 * rho Tau dS* 04 33 50.9175336 +14 50 39.923228 4.98 4.90 4.65 4.41 4.29 A8V 203 0
2 * 9 Aur gD* 05 06 40.6313508866 +51 35 51.804886029       4.8   F2V 174 0
3 * 66 Eri a2* 05 06 45.6520865479 -04 39 18.590188141 4.89 5.06 5.12     B9V 141 1
4 * 17 Aur Al* 05 18 18.8960029818 +33 46 02.520290896   6.102 6.144     B9V+B9.5V 282 0
5 V* R CMa Al* 07 19 28.1782479807 -16 23 42.900652548 6.09 6.05 5.70     F2III/IV 261 0
6 * omi Leo SB* 09 41 09.0330479 +09 53 32.310183 4.22 4.01 3.52 3.11 2.88 F8-G0III+A7m 143 0
7 HD 153720 SB* 16 52 55.2385638376 +75 23 34.112381398 7.210 7.150 6.840     A7m 27 0
8 * c Dra SB* 18 42 37.9530997 +55 32 22.043388   4.943 5.026     A0IIIpHgMn 171 0
9 * 17 Lyr SB* 19 07 25.5818520145 +32 30 06.313891342   5.571 5.221     F0V 87 1
10 * ksi Aqr SB* 21 37 45.1093071 -07 51 15.129919 5.01 4.86 4.69 4.52 4.42 K0III 112 0
11 * pi. PsA Ce* 23 03 29.8165324793 -34 44 57.882657520   5.402 5.124     F1VFe-0.8 98 1

    Equat.    Gal    SGal    Ecl

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2019.11.12-23:41:18

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