dc.contributor.author | Sozzetti, A. | |
dc.contributor.author | Smart, R. L. | |
dc.contributor.author | Drimmel, R. | |
dc.contributor.author | Giacobbe, P. | |
dc.contributor.author | Lattanzi, Mario G. | |
dc.date.accessioned | 2020-03-24T01:06:59Z | |
dc.date.available | 2020-03-24T01:06:59Z | |
dc.date.issued | 2017-10 | |
dc.identifier.citation | Sozzetti , A , Smart , R L , Drimmel , R , Giacobbe , P & Lattanzi , M G 2017 , ' Evidence for orbital motion of CW Leonis from ground-based astrometry ' , Monthly Notices of the Royal Astronomical Society: Letters , vol. 471 , no. 1 , slx082 , pp. L1-L5 . https://doi.org/10.1093/mnrasl/slx082 | |
dc.identifier.issn | 1745-3925 | |
dc.identifier.other | PURE: 12238073 | |
dc.identifier.other | PURE UUID: 728c00c3-ce5f-4357-9aad-d8dd2ea8e4eb | |
dc.identifier.other | Scopus: 85023610565 | |
dc.identifier.uri | http://hdl.handle.net/2299/22454 | |
dc.description | © 2017 The Authors. | |
dc.description.abstract | Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations indicate that CW Leo, the closest carbon-rich asymptotic giant branch star to Sun, might have a low-mass stellar companion. We present archival ground-based astrometric measurements of CW Leo obtained within the context of the Torino Parallax Program and with > 6 yr (1995-2001) of time baseline. The residuals to a single-star solution show significant curvature, and they are strongly correlatedwith thewell-known I-band photometric variations due to stellar pulsations. We describe successfully the astrometry of CW Leo with a variability-induced motion (VIM) + acceleration model. We obtain proper motion and parallax of the centre-of-mass of the binary, the former in fair agreement with recent estimates, the latter at the near end of the range of inferred distances based on indirect methods. The VIM + acceleration model results allow us to derive a companion mass in agreement with that inferred by ALMA, they point towards a somewhat longer period than implied by ALMA, but are not compatible with much longer period estimates. These data will constitute a fundamental contribution towards the full understanding of the orbital architecture of the system when combined with Gaia astrometry, providing an ~25 yr time baseline. | en |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society: Letters | |
dc.subject | AGB | |
dc.subject | Astrometry | |
dc.subject | Binaries: general | |
dc.subject | Circumstellar matter | |
dc.subject | stars: AGB and post | |
dc.subject | Stars: individual: CW Leo | |
dc.subject | stars: late-type | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | Evidence for orbital motion of CW Leonis from ground-based astrometry | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85023610565&partnerID=8YFLogxK | |
dc.identifier.url | https://arxiv.org/pdf/1706.04391.pdf | |
rioxxterms.version | VoR | |
rioxxterms.versionofrecord | https://doi.org/10.1093/mnrasl/slx082 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |