Inici     Sobreviure a l'Univers    
Services
    Per que Habitar     Millors Contribuents     Astro Fotografia     La Col·lecció     Fòrum     Blog New!     FAQ     Login  
→ Adopt this star  

HD 45623


Contingut

Imatges

Carregar la teva Imatge

DSS Images   Other Images


Articles Relacionats

Adaptive-Optics-Assisted Near-Infrared Spectroscopy of SVS 13 and Its Jet
We present long-slit H- and K-band spectroscopy of the low-mass outflowsource SVS 13, obtained with the adaptive-optics-assistedimager-spectrometer NACO on the VLT. With a spatial resolution of<0.25" and a pixel scale of 0.027", we precisely establish therelative offsets of H2, [Fe II], CO, H I, and Na I componentsfrom the source continuum. The H2 and [Fe II] peaks areclearly associated with the jet, while the CO, H I, and Na I peaks arespatially unresolved and coincident with the source, as is expected foremission associated with accretion processes. The H2 profilealong the slit is resolved into multiple components, which increase insize, although they decrease in intensity, with distance from thesource. This trend might be consistent with thermal expansion of packetsof gas ejected during periods of increased accretion activity. Indeed,for the brightest component nearest the source, proper-motionmeasurements indicate a tangential velocity of 0.028" yr-1.It therefore seems unlikely that this emission peak is associated with astationary zone of warm gas at the base of the jet. However, the samecannot be said for the [Fe II] peak, for which we see no evidence formotion downwind, even though radial velocity measurements indicate thatthe emission is associated with higher jet velocities. We postulate thatthe [Fe II] could be associated with a collimation shock at the base ofthe jet.Based on Observations collected at the European Southern Observatory,Paranal, Chile (ESO programs 074.C-0408).

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

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:Auriga
Ascensió Recta:06h29m39.49s
Declinació:+28°46'50.4"
Magnitud Aparent:7.534
Distancia:10000000 parsecs
Moviment propi RA:-0.1
Moviment propi Dec:-5.6
B-T magnitude:7.483
V-T magnitude:7.53

Catàlegs i designacions:
Noms Propis
HD 1989HD 45623
TYCHO-2 2000TYC 1891-1104-1
USNO-A2.0USNO-A2 1125-04053053
HIPHIP 30943

→ Sol·licitar més catàlegs i designacions de VizieR