J/MNRAS/423/2917 Radial velocities in Pal 4 (Frank+, 2012)
The velocity dispersion and mass function of the outer halo globular cluster
Palomar 4.
Frank M.J., Hilker M., Baumgardt H., Cote P., Grebel E.K., Haghi H.,
Kupper A.H.W., Djorgovski S.G.
<Mon. Not. R. Astron. Soc., 423, 2917-2932 (2012)>
=2012MNRAS.423.2917F 2012MNRAS.423.2917F
ADC_Keywords: Clusters, globular ; Radial velocities
Keywords: stars: formation - globular clusters: individual: Palomar 4 -
galaxies: star clusters: general - stellar dynamics
Abstract:
We obtained precise line-of-sight radial velocities of 23 member stars
of the remote halo globular cluster Palomar 4 (Pal 4) using the High
Resolution Echelle Spectrograph at the Keck I telescope. We also
measured the mass function of the cluster down to a limiting magnitude
of V∼28mag using archival Hubble Space Telescope/Wide Field
Planetary Camera 2 (WFPC2) imaging. We derived the cluster's surface
brightness profile based on the WFPC2 data and on broad-band imaging
with the Low Resolution Imaging Spectrometer at the Keck II telescope.
Description:
B and V images centred on Pal 4 were obtained with LRIS on the night
of 1999 January 14.
On three different nights in 1999 February and March, spectra for 24
candidate red giants in the direction of Pal 4 were obtained using
HIRES mounted on the Keck I telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 139 24 Radial velocities for candidate red giants in Pal 4
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See also:
J/PASP/117/37 : BVRI photometry in NGC 2419, Pal 4, and Pal 14 (Saha+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [Pal 4-]
7- 8 I2 --- Pal4 [1/31] Sequential star number of star in in Pal 4
9 A1 --- n_Pal4 [a] a = Probable AGB stars based on their
location in the color-magnitude diagram
11- 14 A4 --- IDS ID from Saha et al., 2005, Cat. J/PASP/117/37 (1)
16- 19 F4.1 arcsec R Distance from the cluster centre
21- 25 F5.2 mag Vmag V magnitude
27- 30 F4.2 mag B-V B-V colour index
32- 36 F5.2 km/s Mean heliocentric radial velocity
38- 41 F4.2 km/s e_ rms uncertainty on HRV
43- 46 I4 s Texp1 Exposure time for observation 1
48- 57 F10.4 d HJD1 Heliocentric Julian date for observation 1
(HJD-2450000)
59- 63 F5.2 --- RTD1 Tonry-Davis R parameter for observation 1
65- 69 F5.2 km/s HRV1 Heliocentric radial velocity for observation 1
71- 74 F4.2 km/s e_HRV1 rms uncertainty on HRV1
76- 79 I4 s Texp2 ? Exposure time for observation 2
81- 90 F10.4 d HJD2 ? Heliocentric Julian date for observation 2
(HJD-2450000)
92- 96 F5.2 --- RTD2 ? Tonry-Davis R parameter for observation 2
98-102 F5.2 km/s HRV2 ? Heliocentric radial velocity for observation 2
104-107 F4.2 km/s e_HRV2 ? rms uncertainty on HRV2
109-111 I3 s Texp3 ? Exposure time
113-122 F10.4 d HJD3 ? Heliocentric Julian date (HJD-2450000)
124-128 F5.2 --- RTD3 ? Tonry-Davis R parameter for observation 3
130-134 F5.2 km/s HRV3 ? Heliocentric radial velocity for observation 3
(HJD-2450000)
136-139 F4.2 km/s e_HRV3 ? rms uncertainty on HRV3
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Note (1): The numbers correspond to the recno of vizir table
J/PASP/117/37/pal4 -1 (S196 ⟺ recno=197).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Apr-2013