Stellar companions and the age of HD 141569 and its circumstellar disk

Citation
Aj. Weinberger et al., Stellar companions and the age of HD 141569 and its circumstellar disk, ASTROPHYS J, 544(2), 2000, pp. 937-943
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004-637X → ACNP
Volume
544
Issue
2
Year of publication
2000
Part
1
Pages
937 - 943
Database
ISI
SICI code
0004-637X(200012)544:2<937:SCATAO>2.0.ZU;2-A
Abstract
We investigate the stellar environment of the beta Pictoris-like star HD 14 1569 with optical spectroscopy and near-infrared imaging. The B9.5 Ve prima ry and two other stars (types M2 and M4) both located in projection less th an 9 " away have the same radial velocity and proper motion and therefore a lmost certainly form a triple star system. From their X-ray flux, lithium a bsorption, and location on pre-main-sequence evolutionary tracks, the compa nions appear to be 5 Myr old. HD 141569A is now one of the few main-sequenc e stars with a circumstellar disk that has a well-determined age. The circu mstellar disk is composed of secondary debris material, thus placing an upp er limit on the time needed for disk processing. These three stars may be p art of an association of young stars.