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HD 18507


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Detection of Molecular Hydrogen Emission Associated with LkHα 264
We have detected the emission of molecular hydrogen from a classicalTTauri star, LkHα264 in the v = 1 - 0 S(1) line at 2.122μm. Theline velocity is coincident with the rest velocity of the star. The lineprofile is well reproduced by a model in which the line emanates frommaterial in a Keplerian rotating circumstellar disk. Fluorescence byX-ray ionization and shock excitation due to accretion or a low-velocitywind are considered for the emission mechanism of molecular hydrogen.

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Observation and Astrometry data

Constellation:Bélier
Right ascension:02h59m15.45s
Declination:+25°27'57.3"
Apparent magnitude:9.135
Proper motion RA:-5.6
Proper motion Dec:-1.7
B-T magnitude:9.427
V-T magnitude:9.16

Catalogs and designations:
Proper Names
HD 1989HD 18507
TYCHO-2 2000TYC 1786-1334-1
USNO-A2.0USNO-A2 1125-00959340
HIPHIP 13915

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