|
||
|
Detailed Description of J/PASP/109/849
|
||
Individual files can be fetched (via http) from
here
or via ftp from: ftp://cdsarc.u-strasbg.fr/pub/cats/J/PASP/109/849
The catalogue can be queried from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/PASP/109/849
This standardized document follows the rules of the Standard Description for Astronomical Catalogues. For those having to work on this catalogue using FORTRAN programs, this ReadMe file can be transformed into a f77-compliant program which reads the files making up this catalogue, in two versions: either a f77 program loading whole files into arrays, or a f77-program reading each data file line by line.
J/PASP/109/849 Probing the LHS Catalog (Gizis+ 1997)
================================================================================
Probing the LHS Catalog I. New Nearby Stars and the Coolest Subdwarf
Gizis J.E., Reid, I.N.
<Publ. Astron. Soc. Pac. 109, 849 (1997)>
=1997PASP..109..849G
================================================================================
ADC_Keywords: Stars, nearby ; Stars, M-type ; Spectroscopy ; Space velocities ;
Stars, distances ; Stars, subdwarf
Description:
We present moderate resolution spectroscopy of 111 cool dwarf stars to
supplement the observations we have already presented in the
Palomar/MSU Nearby-Star Spectroscopic Survey. The sample consists of
71 suspected nearby stars added to the Preliminary Third Catalog of
Nearby Stars since 1991 as well as 40 faint red stars selected from
the LHS catalog. The study was aimed at identifying interesting red
dwarfs, particularly new nearby, ultracool dwarfs, and very metal-poor
stars.
The observations were made using the Palomar 60-inch, the Hale
200-inch and the Las Campanas 100-inch telescopes between June 1995
and January 1996. The spectral resolution is approximately 3 Angstroms
per pixel with wavelength coverage from 6200 to 7500 Angstroms. Table
2 contains bandstrengths for TiO, CaH, and CaOH indices.
File Summary:
FileName Lrecl Records Explanations
× ReadMe 80 . This file
× table1.dat 73 71 Candidate nearby stars: basic data (table 1)
× table2.dat 77 71 Candidate nearby stars: bandstrengths (table 2)
× table3.dat 56 71 Candidate nearby stars: Space Velocities
× table4.dat 58 40 Faint LHS stars
See also:
I/87 : the LHS Catalogue (Luyten 1979)
V/70 : CNS3 (Nearby Stars, Preliminary 3rd Version; Gliese+ 1991)
III/198 : PMSU (Palomar/MSU nearby star spectroscopic survey; Hawley+ 1997)
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
2- 14 A13 --- Name *Star name
16 A1 --- Bin *[ps] Primary or secondary binary comp.
18 A1 --- Note1 *[bcde] Individual Note
20- 21 I2 h RAh Right ascension, 2000
23- 24 I2 min RAm Right ascension, 2000
26- 29 F4.1 s RAs Right ascension, 2000
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd Declination, 2000
35- 36 I2 arcmin DEm Declination, 2000
38- 39 I2 arcsec DEs Declination, 2000
41 I1 --- Src *[5] Source of positional data
43- 47 F5.2 mag MV Absolute V magnitude
49- 52 F4.1 pc r *Distance
54- 55 I2 % er Distance uncertainty
57- 58 I2 % wPi *? Weight for trigonometric parallax
60- 62 I3 % wSp ? Weight for spectroscopic parallax
64- 67 A4 --- SpType Spectral type
69- 73 F5.2 mag Vmag Apparent V magnitude
Note on Name:
Gl - Gliese (1969, Veroff. Astr. Rechen-Instituts, Heidelberg, Nr. 22)
GJ - Gliese & Jahreiss =1979A&AS...38..423G
Wo - Woolley et al (1970, R. Obs. Ann., No. 5) =Cat. V/32
LHS - Luyten Half-Second Catalogue =Cat. I/87
LTT - Luyten Two-Tenths Catalogue
LP - Luyten Palomar proper-motion catalogue
G - Giclas et al (1971, Lowell Proper Motion Survey) =Cat. I/79
Steph - Stephenson (1986, AJ, 91, 137) =Cat. III/123
(Nomenclature note: should be named "StKM")
Note on Bin:
Components in a binary system are identified as
p (primary) or s (secondary, tertiary).
Note on Note1:
b G 035-027 and LP 469-118: Photometry based upon Fleming
et al. (1988) observed V_{system} = 14.20 and assumed
Delta V = 0.42
c Steph 2.908: This is the 809th star in Stephenson (1986).
Photometry is from Weis (1991).
d BD+28 3698: Jahreiss notes that this object is presumably a dK
binary with Delta m = 0.8, see Heintz (1993). The distance
was estimated by Jahreiss.
e LHS 3705: This is also Cou 2234. Estimated distance assumes
the system is a binary with Delta m = 0.0 as determined by
Couteau (1985).
Note on Src:
Source of positional data:
5- Digital Sky Survey
Codes 1-4 were used in Reid et al. (1995),Hawley et al. (1996),
Hawley+ (1997)
Note on r:
Distance and estimated uncertainty (%) from the authors' data,
using a weighted combination of trigonometric and spectroscopic
parallaxes.
Note on wPi:
An entry of -1 indicates that Jahreiss's distance estimates were adopted.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
3- 15 A13 --- Name Star name
19- 23 F5.3 --- TiO1 TiO1 index: F(6718-6723)/F(6703-6708)
25- 29 F5.3 --- TiO2 TiO2 index: F(7058-7061)/F(7043-7046)
31- 35 F5.3 --- TiO3 TiO3 index: F(7092-7097)/F(7079-7084)
37- 41 F5.3 --- TiO4 TiO4 index: F(7130-7135)/F(7115-7120)
43- 47 F5.3 --- TiO5 TiO5 index: F(7126-7135)/F(7042-7046)
49- 53 F5.3 --- CaH1 CaH1 index: F(6380-6390)/F
(6345-6355,6410-6420))
55- 59 F5.3 --- CaH2 CaH2 index: F(6814-6846)/F(7042-7046)
61- 65 F5.3 --- CaH3 CaH3 index: F(6960-6990)/F(7042-7046)
67- 71 F5.3 --- CaOH ? CaOH index: F(6230-6240)/F(6345-6354)
73- 77 F5.2 0.1nm Halpha ? H-alpha Eq. Width
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
2- 14 A13 --- Name Star name
16- 22 F7.4 arcsec/yr pmRA Proper motion in right ascension,
from CNS3
24- 30 F7.4 arcsec/yr pmDE Proper motion in declination, from CNS3
32- 37 F6.1 km/s RV Radial velocity
39- 41 I3 km/s U U space velocity
43- 46 I4 km/s V V space velocity
48- 50 I3 km/s W W space velocity
52- 56 F5.2 mag MV Absolute V magnitude (from table1.dat)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
2- 9 A8 --- Name *Star name
12 A1 --- Note1 *[a] Individual Note
14- 17 F4.1 --- mr r magnitude from Luyten (1979)
19- 23 F5.3 --- TiO5 TiO5 index: F(7126-7135)/F(7042-7046)
25- 29 F5.3 --- CaH1 CaH1 index: F(6380-6390)/F
(6345-6355,6410-6420))
31- 35 F5.3 --- CaH2 CaH2 index: F(6814-6846)/F(7042-7046)
37- 41 F5.3 --- CaH3 CaH3 index: F(6960-6990)/F(7042-7046)
43- 45 F3.1 0.1nm Halpha ? H alpha Equivalent Width
47- 53 A7 --- SpType Spectral Type
55- 58 I4 km/s RV ? Radial Velocity
Note on Name:
LHS - Luyten Half-Second Catalogue =Cat. I/87
Note on Note1:
a Probably misidentified.
================================================================================
(End) John Gizis [U.Mass] 14-Nov-1997
