1999A&AS..140..279G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST21:00:23

1999A&AS..140..279G - Astron. Astrophys., Suppl. Ser., 140, 279-285 (1999/December-2)

Contribution a l'etude des spectres composites. VIII. HD 174016-7, une etoile Ap associee a une geante G. Contribution to the study of composite spectra VIII. HD 174016-7, an Ap star with a giant G.

GINESTET N., GRIFFIN R.F., CARQUILLAT J.M. and UDRY S.

Abstract (from CDS):

HD 174016-7, listed by Hynek (1938CoPer...1...10H) as a star having a composite spectrum, was on our observing programmes of such objects carried out both at the Cambridge Observatories and at the Observatoire Midi-Pyrenees. Most of the observations were made with the CORAVEL spectrovelocimeter of the Swiss telescope at the Observatoire de Haute-Provence. We find that this star is a long-period spectroscopic binary with two correlation dips; we obtain the following orbital elements: P=3097.9days; T=JD2450605.2; ω=204.8°; e=0.600; K1=12.95km/s; K2=15.14km/s; V0=-1.65km/s; a1sini=441.1Gm; a2sini=516.0Gm; M1sin3i=1.967M; M2sin3i=1.681M. The primary is a giant star of spectral type near G6III, and the hot dwarf secondary is found to be a peculiar A star of type A0p Sr, Cr, Eu, Si; so HD 174016-7 is, to our knowledge, the second discovered composite-spectrum binary with a Ap-type hot component. A confrontation with Hipparcos data suggests Mv1=0 and mv=0.6mag. On the basis of very accurate masses of main sequence stars by Andersen (1991) we estimate the mass, M1=2.8M, of the giant primary, the orbital inclination, i=63°, and the mean linear separation of the components, a=7.2AU. The evolutionary status of the system is discussed using Schaller et al. (1992) Mbol/Teff diagram for stars of solar metallicity. Theoretical masses suggested by this diagram confirm the proposed model.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 174016-7 - binaries: spectroscopic - symbiotic - stars: fundamental parameters

Simbad objects: 6

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Number of rows : 6

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 HD 41724 SB* 06 08 29.4193921884 +35 08 24.489483545   7.95 7.60     A2 16 0
2 HD 41725 * 06 08 38.5843784063 +35 07 12.801709147   9.67 9.48     A0 10 0
3 V* V920 Mon EB* 06 57 57.8126863630 +02 17 31.973656358   7.80 7.53     A9/F0m 30 0
4 HD 66068 SB* 08 04 35.9454041148 +53 40 42.752949819 7.460 7.350 7.040     Am 31 0
5 HD 174016 SB* 18 44 21.1829691357 +61 56 19.354703878   7.90 7.45     ~ 24 0
6 HD 177390 SB* 19 02 10.2110409522 +47 17 14.456565234   7.76 7.45     A0 19 0

    Equat.    Gal    SGal    Ecl

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