J/MNRAS/426/1137 Radial velocities in NGC 1851 (Sollima+, 2012)
Spectroscopic hint of a cold stream in the direction of the globular cluster
NGC 1851.
Sollima A., Gratton R.G., Carballo-Bello J.A., Martinez-Delgado D.,
Carretta E., Bragaglia A., Lucatello S., Penarrubia J.
<Mon. Not. R. Astron. Soc. 426, 1137 (2012)>
=2012MNRAS.426.1137S 2012MNRAS.426.1137S
ADC_Keywords: Clusters, globular ; Photometry, UBV ; Radial velocities
Keywords: methods: data analysis - methods: observational -
techniques: radial velocities -
globular clusters: individual: NGC 1851 - Galaxy: halo -
Galaxy: stellar content
Description:
We present the result of a spectroscopic survey performed in the
outskirts of the globular cluster NGC1851 with Visible MultiObject
Spectrograph (VIMOS)/Very Large Telescope (VLT) with the
medium-resolution grism coupled with the GG475 filter. The spectral
coverage is from 5000 to 8000Å with a resolution R∼580. Target
stars have been selected from the photometry of Carballo-Bello et al.
(2012MNRAS.419...14C 2012MNRAS.419...14C), sampling a wide range in magnitude and colour
(16<B<22, 0.6<B-R<2.1). We report the radial velocities of 107 stars
in a region between 12 and 33 arcmin around the cluster centre.
Observations have been performed during three nights in 2008 October
at the Very Large Telescope's (VLT) Unit Telescope 3 (Melipal) at the
European Southern Observatory (ESO), Cerro Paranal, Chile, equipped
with the VIsible MultiObject Spectrograph (VIMOS).
Velocities have been obtained by cross-correlating the spectra of the
individual exposures with a GIRAFFE solar spectrum smoothed to the
resolution of our targets using the region of the H-alpha line.
Typical errors are of about 15km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 107 Radial velocities of target stars
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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3- 5 I3 --- ID [9/730] Identification number
8- 17 F10.7 deg RAdeg Right ascension (J2000)
19- 29 F11.7 deg DEdeg Declination (J2000)
31- 36 F6.3 mag Bmag B magnitude
38- 43 F6.3 mag Vmag V magnitude
46- 50 F5.1 km/s HRV Heliocentric radial velocity
53- 56 F4.1 km/s e_HRV Heliocentric radial velocity error
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Acknowledgements:
Antonio Sollima, antonio.sollima(at)oapd.inaf.it
(End) Antonio Sollima [INAF-OaPd], Patricia Vannier [CDS] 17-Oct-2012