J/AJ/132/161 NStars project: The southern sample. I. (Gray+, 2006)
Contributions to the nearby stars (NStars) project: spectroscopy of stars
earlier than M0 within 40 pc. The southern sample.
Gray R.O., Corbally C.J., Garrison R.F., McFadden M.T., Bubar E.J.,
McGahee C.E., O'Donoghue A.A., Knox E.R.
<Astron. J., 132, 161-170 (2006)>
=2006AJ....132..161G 2006AJ....132..161G
ADC_Keywords: Stars, nearby ; Abundances ; Effective temperatures
Keywords: solar neighborhood - stars: abundances - stars: activity -
stars: fundamental parameters - stars: late-type - stars: statistics
Abstract:
We are obtaining spectra, spectral types, and basic physical
parameters for the nearly 3600 dwarf and giant stars earlier than M0
in the Hipparcos catalog within 40pc of the Sun. Here we report on
results for 1676 stars in the southern hemisphere observed at Cerro
Tololo Inter-American Observatory and Steward Observatory. These
results include new, precise, homogeneous spectral types, basic
physical parameters (including the effective temperature, surface
gravity, and metallicity [M/H]), and measures of the chromospheric
activity of our program stars. We include notes on astrophysically
interesting stars in this sample, the metallicity distribution of the
solar neighborhood, and a table of solar analogs. We also demonstrate
that the bimodal nature of the distribution of the chromospheric
activity parameter logR'HK depends strongly on the metallicity, and
we explore the nature of the "low-metallicity" chromospherically
active.
Description:
The observations reported in this paper were made with the 1.5 m
telescope at CTIO and the 2.3 m Bok telescope at SO between 2000 Dec
21 and 2003 Mar 13.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 102 1676 Spectral types, basic physical parameters and
chromospheric indices
notes.dat 80 315 Individual notes
table5.dat 19 61 Solar Analogues
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See also:
J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
------------------------------------------------------------------------------
1- 10 A10 --- Name Star name
12- 17 I6 --- HIP ? Hipparcos catalog designation
18 A1 --- n_HIP [*] For HIP 117815, 2 HD designations
20- 27 A8 --- HD/DM The HD or DM designation
29- 50 A22 --- SpType MK Spectral type
52 A1 --- n_SpType [*] Note on the spectral type in notes.dat file
54- 58 I5 K Teff ? Effective temperature
60- 63 F4.2 [cm/s2] log(g) ? Log of the surface gravity
65- 67 F3.1 km/s VTurb ? Microturbulent velocity
69- 73 F5.2 [-] [M/H] ? Overall metal abundance (2)
74 A1 --- Note [*] indicates a note detailed in notes.dat file
75 A1 --- Fit [K] Remark on the fitting process (3)
77- 81 F5.3 --- SMW ? Mt. Wilson system chromospheric activity index
83- 89 F7.3 [-] logR ? Ca II K & H line chromospheric flux measure
91- 92 A2 --- AC Chromospheric activity class (4)
94 A1 --- n_AC [*] Note on the chromospheric activity in
notes.dat file
96-102 A7 --- Obs Spectrum source (5)
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Note (2): On a logarithmic scale where [M/H]=0.0 refers to solar metallicity.
Note (3): K indicates that the method used to determine the basic physical
parameters was that adopted for the G and K giants.
Note (4): Chromospheric activity class as follows:
VI = very inactive
I = inactive
A = active
VA = very active
Note (5): Spectrum source as follows:
CTIO = the 1.5m Cassegrain spectrograph at Cerro Tololo Interamerican
Observatory
SO = the Cassegrain spectrograph on the Bok 2.3m telescope of
Steward Observatory
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 80 A69 --- Note Text of the note
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos catalog designation
8- 14 A7 --- HD/DM The HD or DM designation
16- 19 A4 --- Note Note (1)
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Note (1): Notes as follows:
* = Solar analogue with spectral type within 1 subclass of the Sun
** = Candidate solar twin with spectral type, and physical
parameters very similar to that of the Sun
D = Star already in the Keck, Lick & AAT doppler planet-search
program (see Valenti & Fischer, 2005, Cat. J/ApJS/159/141)
EP = Star with a known exoplanet
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-Aug-2007