Home     Per cominciare     Sopravvivere Nell'Universo    
Inhabited Sky
    News@Sky     Astro Foto     La collezione     Forum     Blog New!     FAQ     Stampa     Login  

TYC 2535-291-1


Contenuti

Immagini

Carica la tua immagine

DSS Images   Other Images


Articoli relazionati

Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants
We present the parameters of 891 stars, mostly clump giants, includingatmospheric parameters, distances, absolute magnitudes, spatialvelocities, galactic orbits and ages. One part of this sample consistsof local giants, within 100 pc, with atmospheric parameters eitherestimated from our spectroscopic observations at high resolution andhigh signal-to-noise ratio, or retrieved from the literature. The otherpart of the sample includes 523 distant stars, spanning distances up to1 kpc in the direction of the North Galactic Pole, for which we haveestimated atmospheric parameters from high resolution but lowsignal-to-noise Echelle spectra. This new sample is kinematicallyunbiased, with well-defined boundaries in magnitude and colours. Werevisit the basic properties of the Galactic thin disk as traced byclump giants. We find the metallicity distribution to be different fromthat of dwarfs, with fewer metal-rich stars. We find evidence for avertical metallicity gradient of -0.31 dex kpc-1 and for atransition at ~4-5 Gyr in both the metallicity and velocities. Theage-metallicity relation (AMR), which exhibits a very low dispersion,increases smoothly from 10 to 4 Gyr, with a steeper increase for youngerstars. The age-velocity relation (AVR) is characterized by thesaturation of the V and W dispersions at 5 Gyr, and continuous heatingin U.

Errata in the tape version of the MK classification extension catalogby P.M. Kennedy.
Not Available

Sottometti un nuovo articolo


Link relazionati

  • - Nessun link trovato -
Sottometti un nuovo link


Membro dei seguenti gruppi:


Osservazione e dati astrometrici

Costellazione:Cani da Caccia
Ascensione retta:13h19m26.40s
Declinazione:+31°55'50.8"
Magnitudine apparente:10.565
Moto proprio RA:-16.7
Moto proprio Dec:-15.6
B-T magnitude:11.88
V-T magnitude:10.674

Cataloghi e designazioni:
Nomi esatti   (Edit)
TYCHO-2 2000TYC 2535-291-1
USNO-A2.0USNO-A2 1200-07061758
HIPHIP 65003

→ Richiesta di ulteriori cataloghi da VizieR