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Periodic radial velocity variations in RU Lupi
Stockholm University, Faculty of Science, Department of Astronomy.
2007 (English)In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 461, no 1, 253-259 p.Article in journal (Refereed) Published
Abstract [en]

Context: . RU Lup is a Classical T Tauri star with unusually strong emission lines, which has been interpreted as manifestations of accretion. Recently, evidence has accumulated that this star might have a variable radial velocity.

Aims: .We intended to investigate in more detail the possible variability in radial velocity using a set of 68 high-resolution spectra taken at the VLT (UVES), the AAT (UCLES) and the CTIO (echelle).

Methods: .Using standard cross-correlation techniques, we determined the radial velocity of RU Lup. We analysed these results with Phase-dispersion minimization and the Lomb-Scargle periodogram and searched for possible periodicities in the obtained radial velocities. We also analysed changes in the absorption line shapes and the photometric variability of RU Lup.

Results: .Our analysis indicated that RU Lup exhibits variations in radial velocity with a periodicity of 3.71 days and an amplitude of 2.17 km s-1. These variations can be explained by the presence of large spots, or groups of spots, on the surface of RU Lup. We also considered a low-mass companion and stellar pulsations as alternative sources for these variations but found these to be unlikely.

Place, publisher, year, edition, pages
2007. Vol. 461, no 1, 253-259 p.
Keyword [en]
tars: pre-main sequence, stars: starspots, stars: individual: RU Lupi, binaries: close
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-20162DOI: doi:10.1051/0004-6361:20065268OAI: oai:DiVA.org:su-20162DiVA: diva2:186687
Available from: 2007-02-27 Created: 2007-02-27 Last updated: 2011-01-11Bibliographically approved

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