1,112 datasets found

Keywords: line intensities

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  • Herbig Ae/Be accretion rates & mechanisms

    This work presents a spectroscopic study of 163 Herbig Ae/Be stars. Amongst these, we present new data for 30 objects. Stellar parameters such as temperature, reddening, mass,...
  • Chandra observations of 2106 radio-quiet QSOs

    We present Chandra observations of 2106 radio-quiet quasars in the redshift range 1.7<=z<=2.7 from the Sloan Digital Sky Survey (SDSS), through data release fourteen...
  • Local RR Lyrae stars: native and alien

    Measurements of [Fe/H] and radial velocity are presented for 89 RR Lyrae (RRL) candidates within 6kpc of the Sun. After the removal of two suspected non-RRLs, these stars were...
  • Young radio AGNs study based on SDSS spectroscopy

    The gigahertz peaked spectrum (GPS) sources, compact steep spectrum (CSS) radio sources, and high-frequency peaker (HFP) radio sources are thought to be young radio active...
  • Supplementary data for 146 candidate young stars

    The past two decades have seen dramatic progress in our knowledge of the population of young stars of age <200Myr that lie within 150pc of the Sun. These nearby, young stars,...
  • Unclassified B[e] stars in the MW, SMC and LMC

    We investigated 12 unclassified B[e] stars or candidates, 8 from the Galaxy, 2 from the Large Magellanic Cloud (LMC), and 2 from the Small Magellanic Cloud (SMC). Based on the...
  • Heliocentric radial velocities of R CrB

    Radial-velocity observations made on more than a thousand nights are presented for the type star of the R Coronae Borealis (RCB) class. There are four principal sources: the...
  • High-z LAEs and LBGs in SHARDS survey

    We have undertaken a comprehensive search for both Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) in the Survey for High-z Absorption Red and Dead Sources (SHARDS)...
  • SDSSDR12 eclipsing damped Lyalpha systems

    We present the results of our automatic search for proximate damped Ly{alpha} absorption (PDLA) systems in the quasar spectra from the Sloan Digital Sky Survey Data Release 12....
  • Luminous Ly{alpha} emitters at z~2-3

    Deep narrow-band surveys have revealed a large population of faint Ly{alpha} emitters (LAEs) in the distant Universe, but relatively little is known about the most luminous...
  • Chromospheric activity in 4 open clusters

    We use the LAMOST spectra of member stars in Pleiades, M34, Praesepe, and Hyades to study how chromospheric activity varies as a function of mass and rotation at different age....
  • SC4K catalogue of candidate LAEs

    We present and explore deep narrow- and medium-band data obtained with the Subaru and the Isaac Newton Telescopes in the ~2deg^2^ COSMOS field. We use these data as an extremely...
  • Strong MgII absorber blazars

    It is widely believed that the cool gas clouds traced by MgII absorption, within a velocity offset of 5000km/s relative to the background quasar are mostly associated with the...
  • Candidate LAEs at z=5.7 and z=6.6

    We present spectroscopic follow-up of candidate luminous Ly{alpha} emitters (LAEs) at z=5.7-6.6 in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at z=5.676...
  • Optical/MIR properties of Type 1 AGNs

    We investigated the connection between the mid-infrared (MIR) and optical spectral characteristics in a sample of 82 Type 1 active galactic nuclei (AGNs), observed with Infrared...
  • Damped Lyman Alpha systems equivalent width

    We derive the statistical properties of neutral gas at redshifts 0.11<z<1.65 from ultraviolet (UV) measurements of quasar Ly{alpha} absorption lines corresponding to 369...
  • [OII] nebular emission from MgII absorbers

    We present nebular emission associated with 198 strong Mg II absorbers at 0.35<=z<=1.1 in the fibre spectra of quasars from the Sloan Digital Sky Survey. Measured [OII]...
  • SDSS quasars with PV broad absorption

    Broad absorption lines (BALs) found in a significant fraction of quasar spectra identify high-velocity outflows that might be present in all quasars and could be a major factor...
  • Properties of BAL quasars

    We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over <=0.10-5.25 rest-frame years with at least three spectroscopic...
  • 33 T Tauri stars in Taurus Halpha measurements

    We conducted a 12-month monitoring campaign of 33 T Tauri stars (TTS) in Taurus. Our goal was to monitor objects that possess a disc but have a weak H{alpha} line, a common...
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