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HD 111744

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The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries We present the discovery of seven new T dwarfs identified in the TwoMicron All Sky Survey. Low-resolution (R~150) 0.8-2.5 μm spectroscopyobtained with the Infrared Telescope Facility (IRTF) SpeX instrumentreveals the characteristic H2O and CH4 bands inthe spectra of these brown dwarfs. Comparison with spectral standardsobserved with the same instrument enables us to derive classificationsof T3 to T7 for the objects in this sample. Moderate-resolution (R~1200)near-infrared spectroscopy for a subset of these discoveries reveal K Iline strengths consistent with previously observed trends with spectraltype. Follow-up imaging observations provide proper-motion measurementsfor these sources, ranging from less than 0.1" to 1.55" yr-1.One object, 2MASS 0034+0523, has a spectrophotometric distance placingit within 10 pc of the Sun. This source also exhibits a depressed K-bandpeak reminiscent of the peculiar T dwarf 2MASS 0937+2931 and may be ametal-poor or old, high-mass brown dwarf. We also present low-resolutionSpeX data for a set of M- and L-type dwarf, subdwarf, and giantcomparison stars used to classify 59 additional candidates identified asbackground stars. These are primarily M5-M8.5 dwarfs, many exhibiting HI Paγ, but include three candidate ultracool M subdwarfs and onepossible early-type L subdwarf.
Further Studies of A-Stars and F-Stars in the Region of the North Galactic Pole - Part Four - a Catalogue of Uvbyr Photometry and Derived Quantities Not Available
Further Studies of A-Stars and F-Stars in the Region of the North Galactic Pole - Part Three - a Catalogue of Star Names and Positions Not Available
Photoelectric UBV observations made on the Palomar 20-inch telescope Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973MNRAS.164..133P&db_key=AST
Interstellar reddening near the north galactic pole Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972PASP...84..497F&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Basakci
Sað Açýklýk:	12^h51^m23.32^s
Yükselim:	+12Â°22'22.0"
Görünürdeki Parlaklýk:	8.809
Uzaklýk:	552.486 parsek
özdevim Sað Açýklýk:	-6.7
özdevim Yükselim:	11.6
B-T magnitude:	8.863
V-T magnitude:	8.814

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 111744
TYCHO-2 2000	TYC 885-602-1
USNO-A2.0	USNO-A2 0975-07050410
HIP	HIP 62745

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