Solar-like oscillations in distant stars as seen by CoRoT : the special case of HD 42618, a solar sister

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Barban, C.^1 ; Deheuvels, S.^2,3 ; Goupil, M.J.^1 ; Lebreton, Y.^4,5 ; Mathur, S.^6,7 ; Michel, E.^1 ; Morel, Th^8 ; Ballot, J.^2,3 ; Baudin, F.^9 ; Belkacem, K.^1 ; Benomar, O.^10 ; Boumier, P.^9 ; Davies, G.R.^7,11 ; García, R.A.^7 ; Hall, M.P.^12 ; Mosser, B.^1 ; Poretti, E.^13 ; Régulo, C.^14,15 ; Roxburgh, I.^16 ; Samadi, R.^1 ; Verner, G.^16

LESIA, CNRS, Université Pierre et Marie Curie, France^1

CNRS, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France^2

Université de Toulouse, UPS-OMP, IRAP, France^3

Observatoire de Paris, GEPI, CNRS, France^4

Institut de Physique de Rennes, Université de Rennes 1, UMR 6251, France^5

High Altitude Observatory, NCAR, PO Box 3000, Boulder, CO 80307, United States^6

Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, Centre de Saclay, France^7

Institut d'Astrophysique et de Géophysique, Université de Liége, Belgium^8

Institut d'Astrophysique Spatiale, UMR8617, Université Paris XI, France

(10) Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, Australia

(11) School of Physics and Astronomy, University of Birmingham, United Kingdom

(12) Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston PR1 2HE, United Kingdom

(13) INAF Osservatorio Astronomico di Brera, Merate, Italy

(14) Instituto de Astrofísica de Canarias, Tenerife, Spain

(15) Departamento de Astrofísica, Universidad de la Laguna, Tenerife, Spain

(16) Queen Mary University of London, Astronomy Unit, United Kingdom^9

关键词: Convective envelope;    Light curves;    Main sequence stars;    P modes;    Preliminary analysis;    Scaling relations;    Solar like oscillations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012030/pdf
DOI  :  10.1088/1742-6596/440/1/012030

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We report the observations of a main-sequence star, HD 42618 (Teff5765 K, G3V) by the space telescope CoRoT. This is the closest star to the Sun ever observed by CoRoT in term of its fundamental parameters. Using a preliminary version of CoRoT light curves of HD 42618, p modes are detected around 3.2 mHz associated to0, 1 and 2 modes with a large spacing of 142 μHz. Various methods are then used to derive the mass and radius of this star (scaling relations from solar values as well as comparison between theoretical and observationnal frequencies) giving values in the range of (0.80 - 1.02)Moand (0.91 - 1.01)Ro. A preliminary analysis of0 and 1 modes allows us also to study the amount of penetrative convection at the base of the convective envelope.