86 datasets found

Keywords: Accretion

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  • Kinematics in the M32 nucleus

    Using adaptive optics assisted Gemini/NIFS data, I study the present and past gas accretion in the central 3" of the M32 nucleus. From changes in the spectral slope and CO line...
  • Transition circumstellar disks in Ophiuchus

    We have obtained millimeter-wavelength photometry, high-resolution optical spectroscopy, and adaptive optics near-infrared imaging for a sample of 26 Spitzer-selected transition...
  • IR dust bubbles. II. YSOs model parameters

    We present an analysis of late-O/early-B-powered, parsec-sized bubbles and associated star formation using Two Micron All Sky Survey, GLIMPSE, MIPSGAL, and MAGPIS surveys. Three...
  • H{alpha} emission sources in h and {chi} Per

    We report the discovery of accretion disks associated with ~13Myr old intermediate/low-mass stars in h and {chi} Persei. Optical spectroscopy of ~5000 stars in these clusters...
  • Disk mass loss in the Orion Nebula Cluster

    The relevance of encounters on the destruction of protoplanetary disks in the Orion Nebula cluster (ONC) is investigated by combining two different types of numerical...
  • Black hole mass and accretion rate of AGNs

    Using an empirical relation between the broad-line region size and optical continuum luminosity, we estimated the black hole mass and accretion rate for 135 active galactic...
  • A census of the low accretors. I. The catalog

    Observations have shown that the disk frequency and the fraction of accreting pre-main-sequence stars decrease with the age of the population and that some stars appear to have...
  • Circumstellar disks in the Upper Sco association

    We have performed a survey for new members of the Upper Sco association that have circumstellar disks using mid-infrared photometry from the Wide-field Infrared Survey Explorer...
  • K2 Campaign 2: young disk-bearing stars in Sco & Oph

    The K2 Mission has photometrically monitored thousands of stars at high precision and cadence in a series of ~80-day campaigns focused on sections of the ecliptic plane. During...
  • Spectroscopy of the foreground population in Orion A

    We perform a spectroscopic survey of the foreground population in Orion A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to...
  • Circumstellar disk evolution in NGC 2068/71

    We study the disk and accretion properties of young stars in the NGC 2068 and NGC 2071 clusters. Using low-resolution optical spectra, we define a membership sample and...
  • Spectroscopy in Orion Nebula Cluster

    We present results from high-resolution spectra of 237 stars in the Orion Nebula cluster (ONC) obtained during two engineering runs with the Hectochelle multifiber echelle...
  • Illumination in binaries

    We give a simple, but accurate method that can be used to account for illumination in compact binary systems which have a low-mass companion, even if spherically symmetric...
  • Compact jets in LLAGN

    The disappearance of the accretion disc in low-luminosity active galactic nuclei (LLAGN) leaves behind a faint optical nuclear continuum whose nature has been largely debated,...
  • Accretion variability monitoring in the ONC

    The understanding of the accretion process has a central role in the understanding of star and planet formation. We aim to test how accretion variability influences previous...
  • Radius and luminosity of accretion discs

    We present the results of a study of the half-light radius-vs-black hole mass and the luminosity-vs-black hole mass relations in active galactic nuclei (AGN), when the disc is...
  • Equations of state of accreting neutron stars

    We study the impact of accretion on the equation of state and on the global properties of neutron stars in the framework of the nuclear energy-density functional theory....
  • Ionizing and heating power of ULXs

    While there is now a consensus that X-ray binaries (XRBs) are the dominant X-ray sources in the early Universe and play a significant role during the epoch of heating of the...
  • LkH{alpha} 330 SPHERE/VLT and ALMA images

    Planets that are forming around young stars are expected to leave clear imprints in the distribution of the gas and dust of their parental protoplanetary disks. In this paper,...
  • Quiescent CV TUVO-21acq SALT spectrum

    We present the discovery of TUVO-21acq, a new transient which we detected in the UV using data from the UVOT aboard Swift. We detected two separate outbursts and used the UVOT...
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