Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· arXiv e-print (arXiv:astro-ph/9905243)
· References in the article
· Citations to the Article (57) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (32)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Castor moving group. The age of Fomalhaut and VEGA
Authors:
Barrado y Navascues, D.
Affiliation:
AA(MEC/Fulbright Fellow at the Smithsonian Astrophysical Observatory, 60 Garden St, Cambridge, MA 02138, USA+Real Colegio Complutense at Harvard University, Trowbridge St, Cambridge, MA 02138, USA)
Publication:
Astronomy and Astrophysics, v.339, p.831-839 (1998) (A&A Homepage)
Publication Date:
11/1998
Origin:
A&A
A&A Keywords:
STARS: INDIVIDUAL: HD 216956, STARS: INDIVIDUAL: HD 172167, GALAXY: OPEN CLUSTERS AND ASSOCIATIONS: GENERAL
Bibliographic Code:
1998A&A...339..831B

Abstract

We have recomputed the kinematic properties of several of dozens nearby stars, to try to verify if Castor (alpha Gem) indeed has a cohort of stars sharing the same space motion and age. We used kinematics, the location of the stars in Color-Magnitude Diagrams, their lithium abundances, and their activity, to establish that the moving group seems to be real and to reject several stars which were believed to be part of this group. Of the initial 26 stars, we show that probably only 16 stars are physically associated. The moving group contains several A spectral type stars. Among them, Vega and Fomalhaut, two of the prototypes of the beta Pic type stars. If these stars are coeval, their different levels of IR emission suggest that the time scale for the formation of planets is not universal. Due to the age of the group, these IR excesses would appear as a consequence of collisions and sublimation of larger bodies and they would not arise from protoplanetary structures. Since this association includes several late spectral type stars, we used their properties to estimate their age and, therefore, the age of the group and that of Vega and Fomalhaut. Our estimate for that age is 200+/-100 Myr. Based on observations collected by the Hipparcos satellite

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
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