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HD 13287


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The behavior of some red and infrared helium lines
We analyze the behavior of six lines of neutral helium and one line ofionized helium located in the 6500-10150 A wavelength region. Acomparison was made, whenever possible, of our observations and themodel calculations of Auer & Mihalas (1972, 1973). In two out ofthree cases the agreement is satisfactory with calculations for nonlocalthermodynamic equilibrium (NLTE) and no overlap with H lines. We reportthe detection and provide measurements of two more helium absorptionlines, lambda(8779) and lambda(8584) not reported previously in theliterature.

Southern subdwarf photometry
UBV photometry and normalized UV excesses are reported for 176 southernmetal-poor stars selected from the objective-prism survey of Bidelmanand MacConnell (1973) as well as 49 other metal-deficient starsidentified in other surveys. Photometry is also presented for 32 otherstars lying near the 225 program stars (although not explicitlyidentified as such in the text, the program stars are apparentlysubdwarfs and subdwarf candidates). Previously determined spectral typesand degrees of line weakening are given for the 225 stars, andmetallicities are estimated on the basis of the degrees of lineweakening. It is noted that 33 F and G stars with extreme meannormalized UV excesses of approximately 0.22 mag have a mean Fe/H valueof -1.4 and probably represent halo subdwarfs, while 82 F and G starswith moderate UV excesses are mostly old disk stars.

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观测天体数据

星座:鯨魚座
右阿森松:02h09m23.09s
赤纬:-20°44'33.6"
视星:9.721
右阿森松适当运动:8.3
赤纬适当运动:-8.4
B-T magnitude:11.399
V-T magnitude:9.86

目录:
适当名称   (Edit)
HD 1989HD 13287
TYCHO-2 2000TYC 5861-1574-1
USNO-A2.0USNO-A2 0675-00756264
HIPHIP 10051

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