SDSS-DR14 and LAMOST DR6 spectra in GD-1 stream Virtual Observatory Resource

Authors
  1. Li G.-W.
  2. Yanny B.
  3. Wu Y.
  4. Published by
    CDS
Abstract

Combining data from Gaia DR2, SDSS DR14, and LAMOST DR6, we update the fit to model of the properties of the stellar stream GD-1 and find that it has an age of ~13Gyr, [Fe/H] of -2.2+/-0.12, and a distance from the Sun of ~8kpc. We tabulate six-dimensional (6D) phase-space fiducial points along the GD-1 stream orbit over a 90{deg} arc. The fitted orbit shows that the stream has an eccentricity e~0.3, perigalacticon of 14.2kpc, apogalacticon of 27.0kpc, and inclination i~40{deg}. There is evidence along the arc for four candidate stellar overdensities, one candidate gap, two candidate stellar underdensities, and that the stream is cut off at {phi}_1_~2{deg} (in the stream-aligned ({phi}_1_, {phi}_2_) coordinate system of Koposov+ 2010ApJ...712..260K). The spur originating at {phi}_1_~-40{deg} implies stars were pulled away from the stream trace by an encounter (potentially a dark matter subhalo). The narrowest place (FWHM~44.6pc) of the GD-1 trace is at ({phi}_1_, {phi}2^c^)~(-14{deg}, 0.15{deg}), which is ~(178.18{deg}, 52.19{deg}) in (RA, DE), where the progenitor is possibly located. We also find six blue horizontal branch and 10 blue stragglers spectroscopic stars in the GD-1 stream.

Keywords
  1. Optical astronomy
  2. Spectroscopy
  3. Proper motions
  4. Sloan photometry
  5. Metallicity
  6. Radial velocity
Bibliographic source Bibcode
2018ApJ...869..122L
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IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/869/122
Document Object Identifer DOI
doi:10.26093/cds/vizier.18690122

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History

2019-12-30T13:35:34Z
Resource record created
2019-12-30T13:35:34Z
Created
2021-09-07T12:26:12Z
Updated

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