690 datasets found

Keywords: pre main sequence stars

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  • X-ray properties of Carina OB1 association

    X-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars. Their spectral characteristics provide some...
  • UBVR light curves of weak-line T Tauri stars

    T Tauri stars exhibit variability on all timescales, whose origin is still debated. On WTTS the variability is fairly simple and attributed to long-lived, ubiquitous cool spots....
  • Photometry of a stellar cluster near IRAS 07141-092

    High-resolution optical UBVRI and H{alpha} images obtained with ALFOSC mounted on the Nordic Optical Telescope (NOT), near-infrared JHK_S_ images obtained with NOTCam at the...
  • HK photometry of rho Oph PMS stars

    Variability is a common characteristic of pre-main-sequence stars (PMS). Near-IR variability surveys of young stellar objects (YSOs) can probe stellar and circumstellar...
  • The RMS survey: ^13^CO observations of YSOs

    MSX names, positions, observational rms values and molecular line parameters obtained from Gaussian fits to all detected components made towards the RMS sample of massive young...
  • Infrared photometry of NGC 1893

    The independence of the star formation processes with respect to the environmental conditions is controversial. In particular it is not clear whether star formation in the outer...
  • Young T Tauri star in CB 26 molecular outflows

    The disk-outflow connection is thought to play a key role in extracting excess angular momentum from a forming proto-star. Although jet rotation has been observed in a few...
  • Pre-main sequence evolutionary tracks

    In close binary systems, the axial rotation and the mutual tidal forces of the component stars deform each other and destroy their spherical symmetry by means of the respective...
  • PMS tracks at low Z for 0.1<=M<=1.5

    While MLT-alpha^2D^ models are not available for lower metallicities, we extend to lower Z the NEMO-FST models, under the hypothesis that in such a way we are simulating the...
  • Cool stars and brown dwarfs in Lupus clouds

    Most studies of the stellar and substellar populations of star-forming regions rely on using the signatures of accretion, outflows, disks, or activity characterizing the early...
  • I photometry of very low mass ONC stars

    Rotational studies at a variety of ages and masses are important for constraining the angular momentum evolution of young stellar objects (YSO). Of particular interest are the...
  • YSOs in L1630N and L1641

    Knowledge of the evolution of circumstellar accretion disks is pivotal to our understanding of star and planet formation; and yet despite intensive theoretical and observational...
  • Spectroscopic survey of youngest field stars

    We present the first results of an ambitious ground-based observation programme conducted on 1-4m class telescopes. Our sample consists of 1097 active and presumably young...
  • Canis Major R1 X-ray sources

    The CMa R1 star-forming region contains several compact clusters as well as many young early-B stars. It is associated with a well-known bright rimmed nebula, the nature of...
  • NGC 7129 pre-main sequence stars

    The reflection nebula NGC 7129 has long been known to be a site of recent star formation as shown, e.g., by the presence of deeply embedded protostars and HH objects. However,...
  • Orion pre-main sequence RIJH light curves

    We performed an intensive photometric monitoring of the PMS stars falling in a field of about 10x10 arcminutes in the vicinity of the Orion Nebula Cluster (ONC). Photometric...
  • Emission lines in EX Lup optical spectrum

    A high-resolution optical spectrum of EX Lupi was obtained on 2007 July 30 with FEROS at the 2.2m MPG/ESO telescope in ESO La Silla, Chile. The spectrum shows several emission...
  • Sky maps for hot Jupiters

    The findings of more than 350 extrasolar planets, most of them nontransiting Hot Jupiters, have revealed correlations between the metallicity of the main-sequence (MS) host...
  • UBVRIJHK photometry of Dolidze 25

    The analysis of our deep UBVRIJHK photometry of Dolidze 25, located in the central area of the HII region Sh 2-284, reveals a young cluster with coeval MS and PMS populations of...
  • Near infrared imaging of cometary globule CG12

    Cometary globule 12 is a relatively little investigated medium- and low mass star forming region 210pc above the Galactic plane. This study sets out to discover the possibly...
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