Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0201431)
· References in the article
· Citations to the Article (64) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (14)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Hokupa'a-Gemini Discovery of Two Ultracool Companions to the Young Star HD 130948
Authors:
Potter, D.; Martín, E. L.; Cushing, M. C.; Baudoz, P.; Brandner, W.; Guyon, O.; Neuhäuser, R.
Affiliation:
AA(), AB(), AC(), AD(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822), AE(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; European Southern Observatory, Kark-Schwarzschild-Strasse 2, D-85748 Garching, Germany.), AF(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822), AG(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822)
Publication:
The Astrophysical Journal, Volume 567, Issue 2, pp. L133-L136. (ApJL Homepage)
Publication Date:
03/2002
Origin:
UCP
ApJ Keywords:
Stars: Binaries: Close, Stars: Binaries: Visual, Stars: Evolution, Stars: Fundamental Parameters, Stars: Imaging, Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/339999
Bibliographic Code:
2002ApJ...567L.133P

Abstract

We report the discovery of two faint ultracool companions to the nearby (d~17.9 pc) young G2 V star HD 130948 (HR 5534, HIP 72567) using the Hokupa'a adaptive optics (AO) instrument mounted on the Gemini North 8 m telescope. Both objects have the same common proper motion as the primary star as seen over a 7 month baseline and have near-IR photometric colors that are consistent with an early L classification. Near-IR spectra taken with the NIRSPEC AO instrument on the Keck II telescope reveal K I lines, FeH, and H2O band heads. Based on these spectra, we determine that both objects have a spectral type of dL2 with an uncertainty of two spectral subclasses. The position of the new companions on the H-R diagram in comparison with theoretical models is consistent with the young age of the primary star (<0.8 Gyr) estimated on the basis of X-ray activity, lithium abundance, and fast rotation. HD 130948B and C likely constitute a pair of young contracting brown dwarfs with an orbital period of about 10 yr and will yield dynamical masses for L dwarfs in the near future. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (US), the Particle Physics and Astronomy Research Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints