Herbig Ae/Be star

A Herbig Ae/Be star (HABe) is a pre-main-sequence star – a young (<10Myr) star of spectral types A or B. These stars are still embedded in gas-dust envelopes and are sometimes accompanied by circumstellar disks. Hydrogen and calcium emission lines are observed in their spectra. They are 2-8 Solar mass (M_☉) objects, still existing in the star formation (gravitational contraction) stage and approaching the main sequence (i.e. they are not burning hydrogen in their center). In the Hertzsprung–Russell diagram these stars are located to the right of the main sequence. They are named after the American astronomer George Herbig, who first distinguished them from other stars in 1960. The original Herbig criteria were:

单词	Ae star
释义	Ae star 英语百科 Herbig Ae/Be star A Herbig Ae/Be star (HABe) is a pre-main-sequence star – a young (<10Myr) star of spectral types A or B. These stars are still embedded in gas-dust envelopes and are sometimes accompanied by circumstellar disks. Hydrogen and calcium emission lines are observed in their spectra. They are 2-8 Solar mass (M_☉) objects, still existing in the star formation (gravitational contraction) stage and approaching the main sequence (i.e. they are not burning hydrogen in their center). In the Hertzsprung–Russell diagram these stars are located to the right of the main sequence. They are named after the American astronomer George Herbig, who first distinguished them from other stars in 1960. The original Herbig criteria were:
随便看	acyloxylation acyloxyls Acyl peroxide acylpetide hydrolase acylphenolphthalein acylphenylalanine amide acylphenylalanine ester acyl phloroglucinol Acylphosphatase acylphosphatases acylphosphate acyl phosphate Acyl phosphate hexose phosphotransferase Acylphosphatidylethanolamine acylphosphatidyl ethanolamine acylphosphatidylethanolamines acylpiperidine acylpiperidines acyl protein acylpyridine acylpyridines Acylpyrin acylpyrrole acylpyrroles acyl pyruvase

Ae star

Herbig Ae/Be star