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HD 21300


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Evidence of helium abundance differences between young groups of stars
Seven groups of B-type stars - Sco-Cen, NGC 6231, LacOBI,OriOBIb, h + chi Per, CepOBIII, and field stars - wereinvestigated photoelectrically to determine whether helium abundance isuniform in the solar neighborhood and in a region of the spiral arm ofthe Galaxy. Observations were performed using an echelle spectrometer inthe narrow band index of the I (4026) of the He I-4026 line. Amodel-atmosphere analysis of I (4026) and the beta index of the H betaline shows that in the spectral range B O-B 2, the relation between I(4026) and beta is insensitive to differences in the surface gravity butsensitive to differences in the helium to hydrogen ratio. It is foundthat stars in the two groups most distant from the sun - h + chi Per andCepOBIII - have a lower helium abundance than stars in the solarneighborhood.

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观测天体数据

星座:網罟座
右阿森松:03h23m22.13s
赤纬:-58°49'59.6"
视星:7.983
距离:264.55 天文距离
右阿森松适当运动:2.1
赤纬适当运动:-4.2
B-T magnitude:9.398
V-T magnitude:8.1

目录:
适当名称
HD 1989HD 21300
TYCHO-2 2000TYC 8499-1305-1
USNO-A2.0USNO-A2 0300-01000375
HIPHIP 15780

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