Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732205m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #322.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Phoenix Giants are first-ascent giant stars orbited by substantial dusty and gaseous disks that are sometimes accreting onto the central star. We present the characterization of two dusty first-ascent giant stars identified through cross-correlating the Tycho-2 and IRAS catalogs. CD-30 11814 (hereafter Alexander's star) is a high-velocity Pop II star that exhibits rapid accretion and outflowing gas. Multiple epochs of spectroscopic observations show that the double-peaked Ca II infrared triplet emission from this source has variable morphology and strength. TYC 596 145 1 (hereafter Phoebe's star) is a lithium-rich K2.5 III star orbited by a substantial icy disk as indicated by water-ice features detected in Spitzer IRS and IRTF/SpeX infrared spectroscopy. Each source can yield interesting insights into binary star evolution and planetary systems.
Funding for this research came from NASA grants and an LLNL-Minigrant to UCLA and from the Spitzer Visiting Graduate Student Program.
Bessell Michael S.
Melis Carl
Murphy Simon J.
Rhee Joseph H.
Song Inseok
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