J/A+A/526/A127 Velocities of M67 main-sequence and giant stars (Pasquini+, 2011)
Gravitational redshifts in main-sequence and giant stars.
Pasquini L., Melo C., Chavero C., Dravins D., Ludwig H.-G., Bonifacio P.,
De La Reza R.
<Astron. Astrophys. 526, A127 (2011)>
=2011A&A...526A.127P 2011A&A...526A.127P
ADC_Keywords: Clusters, open ; Stars, dwarfs ; Stars, giant ;
Radial velocities ; Rotational velocities
Keywords: stars: fundamental parameters -
galaxies: star clusters : individual: M67 - stars: late-type -
stars: atmospheres - techniques: radial velocities - gravitation
Abstract:
Precise analyses of stellar radial velocities is able to reveal
intrinsic causes of the wavelength shifts of spectral lines (other
than Doppler shifts due to radial motion), such as gravitational
redshifts and convective blueshifts. Aims. Gravitational redshifts in
solar-type main-sequence stars are expected to be some 500m/s
greater than those in giants. We search for this difference in
redshifts among groups of open-cluster stars that share the same
average space motion and thus have the same average Doppler shift.
Description:
We observed 144 main-sequence stars and cool giants in the M67 open
cluster using the ESO FEROS spectrograph and obtained radial
velocities by means of cross-correlation with a spectral template.
Binaries and doubtful members were not analyzed, and average spectra
were created for different classes of stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 163 Observed targets in M67
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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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1- 9 A9 --- Name Object name (1)
11- 15 F5.3 mag B-V ?=- B-V colour index
17- 21 F5.2 mag Vmag ?=- V magnitude
23- 28 F6.2 km/s RV Radial velocity (accuracy ∼ 20m/s)
30 A1 --- l_vsini Limit flag on vsini
31- 34 F4.1 km/s vsini Projected rotational velocity
36- 42 A7 --- Source Source of the data (2)
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Note (1): For object identifications:
* S NNNN are from Sanders (1977A&AS...27...89S 1977A&AS...27...89S),
<Cl* NGC 2682 Sand NNNN> in Simbad
* MMJNNNN from Montgomery et al. (1993, Cat. J/AJ/106/181),
<Cl* NGC 2682 MMJ NNNN> in Simbad
Note (2): Data source are either Paper I (Melo et al., 2001A&A...375..851M 2001A&A...375..851M)
or the observing runs described in Section 3.
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Acknowledgements:
Luca Pasquini, lpasquin(at)eso.org
References:
Melo et al., Paper I 2001A&A...375..851M 2001A&A...375..851M
(End) Patricia Vannier [CDS] 06-Jan-2011