Other
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005rmxaa..41...77c&link_type=abstract
Revista Mexicana de Astronomía y Astrofísica Vol. 41, pp. 77-85 (2005) (http://www.astroscu.unam.mx/~rmaa/)
Other
2
Stars: Abundances, Stars: Emission Line, Stars: Individual (Hbc98), Stars: Pre-Main Sequence
Scientific paper
We present recent spectroscopic (resolution ≥ 1750 at λ = 6708 Å) and photometric (ubvy- β ) observations of the singular weak-line Tstar HBC 498 (= DL Ori/G1) still associated with its parental dust cloud and of at least four other bright neighboring stars associated with reflection nebulosities that together form a tight trapezium in L1641 in Orion. Most of them have the youth signature of Li 0 in their spectra. We find that two of the objects are "classic" Tand another two are "weak-line" Tstars. From the data and their comparison with models of pre-main sequence stellar evolution we find that they are coeval, and that they have masses of the order of 1 M&sun; and ages of the order of their gravitational contraction times or less (≈ 1 - 5×105 yr). Finally, we briefly discuss their evolutionary state and its repercussions.
Chavarria-K Carlos
de Lara E.
Moreno-Corral Marco Arturo
Terranegra L.
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