J/AJ/123/3356 Palomar/MSU nearby star spectroscopic survey. III. (Gizis+, 2002)
The Palomar/MSU nearby star spectroscopic survey.
III. Chromospheric activity, M dwarf ages and the local star formation history.
Gizis J.E., Reid I.N., Hawley S.L.
<Astron. J. 123, 3356 (2002)>
=2002AJ....123.3356G 2002AJ....123.3356G
ADC_Keywords: Stars, nearby ; Stars, M-type ; Spectroscopy ; Radial velocities
Keywords: Galaxy: formation - solar neighborhood - stars: chromospheres -
stars: formation - stars: low-mass, brown dwarfs
Abstract:
We present high-resolution echelle spectroscopy of 676 nearby
M dwarfs. Our measurements include radial velocities, equivalent
widths of important chromospheric emission lines, and rotational
velocities for rapidly rotating stars. We identify several distinct
groups by their Hα properties and investigate variations in
chromospheric activity among early (M0-M2.5) and mid (M3-M6) dwarfs.
Using a volume-limited sample together with a relationship between age
and chromospheric activity, we show that the rate of star formation in
the immediate solar neighborhood has been relatively constant over the
last 4Gyr. In particular, our results are inconsistent with recent
large bursts of star formation. We use the correlation between
Hα activity and age as a function of color to set constraints on
the properties of L and T dwarf secondary components in binary
systems. We also identify a number of interesting stars, including
rapid rotators, radial velocity variables, and spectroscopic binaries.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 66 1609 Radial Velocities
table4.dat 77 676 Equivalent Widths
table6.dat 24 23 Double-lined binaries
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See also:
III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)
V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [RHG95] ? The number from Papers I and II (G1)
6- 22 A17 --- Name Star name
24- 35 F12.4 d JD Julian Date of observation
37- 42 F6.1 km/s RV ? Radial velocity
44- 49 F6.1 km/s Mean radial velocity
51- 54 F4.1 km/s e_ ? Observed standard dispersion of
57- 66 A10 --- Com Comments
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [RHG95] The number from Papers I and II (G1)
6- 11 F6.3 0.1nm EWHa The average Hα equivalent width (2)
13- 18 F6.3 0.1nm EWHeD3 ? The average He D3 (5876) equivalent width (2)
20- 25 F6.3 0.1nm EWHe6678 ? The average He (6678) equivalent width (2)
27- 32 F6.3 0.1nm EWHb ? The average Hβ equivalent width (2)
34- 39 F6.3 0.1nm EWHg ? The average Hγ equivalent width (2)
41- 46 F6.3 0.1nm EWHd ? The average Hδ equivalent width (2)
48- 53 F6.3 0.1nm EWHe ? The average Hε equivalent width (2)
55- 60 F6.3 0.1nm EWH6 ? The average H6 equivalent width (2)
62- 63 I2 --- o_EWHa Number of Hα observations
65- 69 F5.3 0.1nm e_EWHa ? Observed standard dispersion of EWHa (2)
71- 76 F6.3 0.1nm e_EWHb ? Observed standard dispersion of EWHb (2)
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Note (2): In Angstroems.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [RHG95] ? Sequential number
9- 17 A9 --- Name Name
19 I1 --- Ref [1-3]? Reference (1)
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Note (1): References are numbered as follows:
1 = Strassmeier et al., 1993A&AS..100..173S 1993A&AS..100..173S, Cat. V/76
2 = Tokovinin, 1992A&A...256..121T 1992A&A...256..121T, Cat. III/191
3 = Delfosse et al., 1999A&A...344..897D 1999A&A...344..897D
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Table 5: Rapid rotators
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[RHG95] Name vsini (km/s)
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381 G173-039 30
556 GJ 1054A 30
802 G039-029 30
1279 LHS 5134 35
1759 Steph 932 30
2128 G165-008 80
3453 G188-038 37
3198 Gl 791.2 35
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Table 7: Candidate single-lined binaries: multiple observations
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[RHG95] Name σ Ref
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853 LP 476-207 4.0 Delfosse et al., 1999A&A...344..897D 1999A&A...344..897D
1554 Gl 372 24.0 Harlow, 1996AJ....112.2222H 1996AJ....112.2222H
2097 Gl 508A 5.5
2708 G203-47 34.2 Delfosse et al., 1999A&A...344..897D 1999A&A...344..897D
3563 Gl 867B 20.9
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Table 8: Candidate single-lined binaries: velocity differences
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[RHG95] Name DV Source
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1019 Gl 228A -54 Upgren & Caruso, 1988AJ.....96..719U 1988AJ.....96..719U
1361 Gl 319A -8 Upgren & Harlow, 1996PASP..108...64U 1996PASP..108...64U
1938 Gl 462 -9 Upgren & Caruso, 1988AJ.....96..719U 1988AJ.....96..719U
2157 Gl 521.1 -25 Stauffer & Hartmann, 1986ApJS...61..531S 1986ApJS...61..531S
2235 Gl 540 -10 Stauffer & Hartmann, 1986ApJS...61..531S 1986ApJS...61..531S
2486 Gl 600 10 Upgren & Caruso, 1988AJ.....96..719U 1988AJ.....96..719U
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Table 9: Candidate wide binaries
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Star 1 Vrad Star 2 Vrad Separation DV/σ
km/s km/s AU
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Gl 48 0.5 G22C -4.9 225400 3.1
Gl 22B -3.4
Gl 49 -5.0 Gl 51 -7.3 3530 1.5
Gl 140A 24.0 Gl 140C 19.1 2310 3.3
G192-11 2.0 G192-12 2.8 2965 0.5
Gl 469 -10.2 Gl 471 15.1 52170 17.
Wo 9490A -29.2 Wo 9490C -26.6 3538 1.7
Gl 720A -30.4 Gl 720B -32.2 2312 1.7
Gl 897A -0.8 Gl 898 0.7 6068 1.0
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Table 10: M and L/T dwarf systems
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[RHG95] M dwarf Sp. Type V-I Hα L/T dwarf Sp. Type Age Ref
Name 0.1nm Name Gyr
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1021 Gl 229A M0.5 2.01 -0.5 Gl 229B T >0.32 1
2368 Gl 570BC M1.0 2.12 -0.4 Gl 570D T >0.40 2
G 196-3 M2.5 2.34 4. G196-3B L <0.64 3
3 GJ 1001A M3.5 2.69 < 1. GJ 1001B L >1.4 4
2358 Gl 569 A M2 2.24 1.29 Gl 569Ba/Bb M8/L0? <0.52 5
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References:
1: Nakajima et al., 1995Natur.378..463N 1995Natur.378..463N
2: Burgasser et al., 2000ApJ...531L..57B 2000ApJ...531L..57B
3: Rebolo et al., 1998Sci...282.1309R 1998Sci...282.1309R
4: Goldman et al., 1999A&A...351L...5G 1999A&A...351L...5G
5: Martin et al., 2000ApJ...529L..37M 2000ApJ...529L..37M
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Global Notes:
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Note (G1): The number is merely the rank order in the Preliminary Version
of the Third Catalog of Nearby Stars, ADC/CDS Catalog V/70 (pCNS3),
and is not an officially recognized designation; it provides a
straightforward means of cross-referencing results between tables for
this relatively large data set.
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History:
From electronic version of the journal
* 28-Apr-2005: last column of table4 added at CDS.
References:
Reid et al., Paper I, 1995AJ....110.1838R 1995AJ....110.1838R, Cat. III/198
Hawley et al., Paper II, 1996AJ....112.2799H 1996AJ....112.2799H, Cat. III/198
(End) Greg Schwarz [AAS], Patricia Bauer, Francois Ochsenbein [CDS] 06-Sep-2002