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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 693643.0, MPI für Astronomie / Publikationen_mpia
Stellar activity, difference spectra, and the dynamical masses of M dwarf companions
Authors:Kostogryz, N. M.; Kürster, M.; Lyubchik, Y.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Memorie della Societa Astronomica Italiana
Volume:84
Issue / Number:4
Start Page:id. 1047
Audience:Not Specified
Abstract / Description:We provide a differential technique that aims at discovering companions to late-type stars by removing the stellar spectrum through subtraction of spectra obtained at different orbital phases and identifying the companion spectrum in the difference spectrum. As we need to observe at different observational epochs our approach may be susceptible to changes in the stellar surface temperature distribution arising from appearing and disappearing star spots. For very active stars the temperature difference between the spots and the photosphere remains a rather unknown parameter. In our simulations we assume a single spot that can have different values of surface filling factor, spot-to-photosphere temperature ratio, and instantaneous radial velocity on the rotating star. For our test case, the M dwarf/brown dwarf binary
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0037-8720
URL:http://cdsads.u-strasbg.fr/abs/2013MmSAI..84.1047K
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