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HD 239595


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Helium abundance in atmospheres of stars appearing in OB associations and young clusters
An improved version of Liubimkov's (1974) method is used to determinethe relative helium abundance, N(He)/N(H), in the atmospheres of 80stars of spectral types O6.5 to B2 belonging to OB associations andyoung clusters. Specific results are presented for Mon OB1 and OB2, CepOB2 and OB3, Sco OB2, Lac OB1, Ori OB1, and Cas OB6. It is shown thatthe mean value of N(He)/N(H) increases with increasing stellar age andincreasing cluster or association size. A relative helium abundance of0.09 to 0.10 is found to be appropriate for stars that are severalmillion years old, and a relative abundance of 0.13 is obtained forstars older than 10 million years. It is noted that the latter value isalso characteristic of hot field stars.

A Spectroscopic and Photometric Investigation of the Association Cepheus OB2
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1968ApJ...154..923S&db_key=AST

Determination of size, color indices, and spectral classes of stars in an area centered on R.A.=21h24m, Dec=+58.5deg.
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观测天体数据

星座:仙王座
右阿森松:21h10m57.66s
赤纬:+60°13'16.3"
视星:9.309
右阿森松适当运动:-1.3
赤纬适当运动:-5.3
B-T magnitude:9.58
V-T magnitude:9.332

目录:
适当名称   (Edit)
HD 1989HD 239595
TYCHO-2 2000TYC 4248-1066-1
USNO-A2.0USNO-A2 1500-07834655
HIPHIP 104567

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