2016A&A...588A..71E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST22:59:08

2016A&A...588A..71E - Astronomy and Astrophysics, volume 588A, 71-71 (2016/4-1)

HD 41641: A classical δ Sct-type pulsator with chemical signatures of an Ap star.

ESCORZA A., ZWINTZ K., TKACHENKO A., VAN REETH T., RYABCHIKOVA T., NEINER C., PORETTI E., RAINER M., MICHEL E., BAGLIN A. and AERTS C.

Abstract (from CDS):

Context. Among the known groups of pulsating stars, δ Sct stars are one of the least understood. Theoretical models do not predict the oscillation frequencies that observations reveal. Complete asteroseismic studies are necessary to improve these models and better understand the internal structure of these targets.
Aims. We study the δ Sct star HD 41641 with the ultimate goal of understanding its oscillation pattern.
Methods. The target was simultaneously observed by the CoRoT space telescope and the HARPS high-resolution spectrograph. The photometric data set was analyzed with the software package PERIOD04, while FAMIAS was used to analyze the line profile variations. The method of spectrum synthesis was used for spectroscopically determining the fundamental atmospheric parameters and individual chemical abundances.
Results. A total of 90 different frequencies was identified and analyzed. An unambiguous identification of the azimuthal order of the surface geometry could only be provided for the dominant p-mode, which was found to be a nonradial prograde mode with m=+1. Using Teff and logg, we estimated the mass, radius, and evolutionary stage of HD 41641. We find HD 41641 to be a moderately rotating, slightly evolved δ Sct star with subsolar overall atmospheric metal content and unexpected chemical peculiarities.
Conclusions. HD 41641 is a pure δ Sct pulsator with p-mode frequencies in the range from 10d–1 to 20d–1. This pulsating star presents chemical signatures of an Ap star and rotational modulation due to surface inhomogeneities, which we consider indirect evidence of the presence of a magnetic field.

Abstract Copyright: © ESO, 2016

Journal keyword(s): asteroseismology - stars: variables: delta Scuti - techniques: photometric - techniques: spectroscopic - stars: individual: HD 41641 - stars: oscillations

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

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 V* CP Oct dS* 03 09 53.7780186985 -83 31 53.589392484   8.01 7.61     F2/3Ib/II 47 0
2 HD 41641 dS* 06 06 40.5781479152 +06 43 49.891916932   8.14 7.86     A5III 18 0
3 V* FG Vir dS* 12 14 15.4567370777 -05 42 59.750421714   6.807 6.558     A8/9V 207 0
4 * 4 CVn dS* 12 23 47.0114947753 +42 32 33.866981068   6.382 6.022     F3III-IV 188 0
5 HD 188774 dS* 19 55 10.0376514155 +41 17 10.270913232   9.05 8.81     A7.5IV-III4A8IIIs 27 0
6 * 15 Vul a2* 20 01 06.0484585 +27 45 12.863884   4.829 4.651     A4III 224 0
7 V* BI Mic a2* 21 26 03.8658561804 -29 55 48.036180889   9.10 8.81     ApSrEu 69 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...588A..71E and select 'bookmark this link' or equivalent in the popup menu


2020.07.09-22:59:08

© Université de Strasbourg/CNRS

    • Contact