Inici     Començant     Sobreviure a l'Univers    
Inhabited Sky
    News@Sky     Astro Fotografia     La Col·lecció     Fòrum     Blog New!     FAQ     Premsa     Login  

HD 116717


Contingut

Imatges

Carregar la teva Imatge

DSS Images   Other Images


Articles Relacionats

Carbon Isotopic Abundances in the Red Giants of ω Centauri (NGC 5139)
12C and 13C abundances have been measured in 11bright giant members of the globular cluster ω Centauri viaobservations of the first-overtone CO bands near 2.3 μm. The stars inthis sample were selected to span a substantial fraction of the range ofiron abundances found in this cluster. In addition, the sample covers arange of [O/Fe], [Na/Fe], and [Al/Fe] abundance ratios derived inprevious studies. In all ω Cen giants the12C/13 C abundance ratio is found to be quite low,indicating deep mixing in these red giants. The mean value for theentire sample is <12C/13C>=4.3+/-0.4(σ=1.3), with nine stars equal, within the errors, to theequilibrium ratio 12C/13C=3.5 and two stars havingslightly higher values. There is no correlation between the12C/13 C and the abundance of iron. In addition,no correlation of 12C/13C with [12C/Fe]is found (all giants are deeply mixed), although the derived abundancesof [12C/Fe] show a positive correlation with [O/Fe] and ananticorrelation with [Na/Fe] (with the oxygen and sodium abundancestaken from previous studies in the literature). A comparison of theisotopic carbon ratios in ω Cen with those from other globularclusters (M4, M71, NGC 6752, and 47 Tuc) and with literature oxygenabundances, may reveal a slight trend of decreasing12C/13C ratios with decreasing [O/Fe] in theentire globular cluster sample of red giants. A comparison between12C/13C and both [Na/Fe] and [Al/Fe], however,reveals no trend.

A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

The Evolutionary Status of the Blue Halo Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973ApJS...26...37N&db_key=AST

Enviar un nou article


Enllaços Relacionats

  • - No s'ha trobat enllaços -
Enviar un nou enllaç


Membre dels grups següents:


Dades d'Observació i Astrometria

Constel·lació:Centaurus
Ascensió Recta:13h26m16.69s
Declinació:-48°47'11.7"
Magnitud Aparent:6.678
Distancia:113.766 parsecs
Moviment propi RA:-49
Moviment propi Dec:-18.9
B-T magnitude:6.717
V-T magnitude:6.682

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 116717
TYCHO-2 2000TYC 8256-1278-1
USNO-A2.0USNO-A2 0375-18196403
HIPHIP 65551

→ Sol·licitar més catàlegs i designacions de VizieR