2013MNRAS.433.3336F


Query : 2013MNRAS.433.3336F

2013MNRAS.433.3336F - Mon. Not. R. Astron. Soc., 433, 3336-3345 (2013/August-3)

Do the close binaries HD 22128 and HD 56495 contain Ap or Am stars ?

FOLSOM C.P., WADE G.A. and JOHNSON N.M.

Abstract (from CDS):

HD 22128 and HD 56495 are both double-lined spectroscopic binary systems with short orbital periods, which have been proposed to host magnetic Ap stars. Ap stars in short-period binary systems are very rare and may provide insight into the origin of magnetism in A-type stars. We study these two systems using high-resolution MuSiCoS spectropolarimetric data, in order to assess the presence of magnetic fields and study the atmospheric chemistry of the components. This represents the first modern magnetic measurements and careful spectroscopic analyses of these stars. We find no evidence of a magnetic field in any of the stars, with precise uncertainties on the longitudinal magnetic field of 50 and 80G in the components of HD 22128, and 80 and 100G in the components of HD 56495. We performed detailed abundance analyses of both stars in both systems, finding clear evidence of Am chemical peculiarities in both components of HD 22128, and in the brighter component of HD 56495, with overabundant iron peak elements and underabundant Sc and Ca. The less luminous component of HD 56495 is chemically normal. The atmospheric chemistry is consistent with the absence of magnetic fields, and consistent with the theory of Am star formation proposing that tidal interactions slow the rotation rate of the star, allowing atomic diffusion to proceed efficiently.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): stars: abundances - binaries: spectroscopic - stars: chemically peculiar - stars: individual: HD 22128 - stars: individual: HD 56495 - stars: magnetic field

Simbad objects: 10

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Number of rows : 10
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 5550 SB* 00 58 31.0618050802 +66 21 06.453192752 5.82 5.95 5.97     A0III 51 0
2 HD 22128 SB* 03 33 37.9174537876 -07 24 54.019790036   7.97 7.56     A3/5V+(G) 41 0
3 BD-06 1253 Ae* 05 36 25.4313245626 -06 42 57.684449700   11.65 10.9 10.29   A1e 417 1
4 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1441 0
5 * E Pup SB* 07 12 15.8091084326 -40 29 55.731520120   5.38 5.31     A1/2V:+ApSrEu 97 0
6 HD 56495 SB* 07 16 57.7440521580 -07 31 39.070012667   7.96 7.65     A2+(G) 43 0
7 V* V827 Mon a2* 07 29 35.4522068599 -09 15 33.315319853   8.40 7.94     A6IIIpSr 63 0
8 V* SV Crt a2* 11 16 58.1773504752 -07 08 04.871249847 6.49 6.34 6.14     ApSrCrEu 197 1
9 HD 135728 * 15 17 38.8405230857 -31 27 32.145899782   9.00 8.65     ApSrEuCr 27 0
10 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2557 0

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2021.10.27-06:57:05

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