Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 21300


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

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.

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Δίκτυον
Right ascension:03h23m22.13s
Declination:-58°49'59.6"
Apparent magnitude:7.983
Distance:264.55 parsecs
Proper motion RA:2.1
Proper motion Dec:-4.2
B-T magnitude:9.398
V-T magnitude:8.1

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 21300
TYCHO-2 2000TYC 8499-1305-1
USNO-A2.0USNO-A2 0300-01000375
HIPHIP 15780

→ Request more catalogs and designations from VizieR