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HD 98800: A Unique Stellar System of Post-T Tauri StarsHD 98800 is a system of four stars, and it has a large infrared excess that is thought to be due to a dust disk within the system. In this paper we present new astrometric observations made with Hipparcos, as well as photometry from Hubble Space Telescope WFPC2 images. Combining these observations and reanalyzing previous work allow us to estimate the age and masses of the stars in the system. Uncertainty in these ages and masses results from uncertainty in the temperatures of the stars and any reddening they may have. We find that HD 98800 is most probably about 10 Myr old, although it may be as young as 5 Myr or as old as 20 Myr old. The stars in HD 98800 appear to have metallicities that are about solar. An age of 10 Myr means that HD 98800 is a member of the post T Tauri class of objects, and we argue that the stars in HD 98800 can help us understand why post T Tauris have been so elusive, HD 98800 may have formed in the Centaurus star-forming region, but it is extraordinary in being so young and yet so far from where it was born.
Document ID
19990039652
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Soderblom, David R.
(Space Telescope Science Inst. Baltimore, MD United States)
King, Jeremy R.
(Space Telescope Science Inst. Baltimore, MD United States)
Siess, Lionel
(Observatoire de Grenoble Grenoble, France)
Noll, Keith S.
(Space Telescope Science Inst. Baltimore, MD United States)
Gilmore, Diane M.
(Space Telescope Science Inst. Baltimore, MD United States)
Henry, Todd J.
(Space Telescope Science Inst. Baltimore, MD United States)
Nelan, Edmund
(Space Telescope Science Inst. Baltimore, MD United States)
Burrows, Christopher J.
(Space Telescope Science Inst. Baltimore, MD United States)
Brown, Robert A.
(Space Telescope Science Inst. Baltimore, MD United States)
Perryman, M. A. C.
(European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Benedict, G. Fritz
(McDonald Observatory Austin, TX United States)
McArthur, Barbara J.
(McDonald Observatory Austin, TX United States)
Franz, Otto G.
(Lowell Observatory Flagstaff, AZ United States)
Wasserman, Laurence H.
(Lowell Observatory Flagstaff, AZ United States)
Jones, Burton F.
(California Univ. Santa Cruz, CA United States)
Latham, David W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Torres, Guillermo
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Stefanik, Robert P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Date Acquired
August 19, 2013
Publication Date
May 1, 1998
Publication Information
Publication: Astrophysical Journal
Publisher: American Astronomical Society
Volume: 498
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NAGw-4837
Distribution Limits
Public
Copyright
Other

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