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J/MNRAS/257/257 Proper motions from Schmidt plates. II. The Hyades. (Reid 1992)
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Proper motions from Schmidt plates. II. The Hyades.
Reid N.
<Mon. Not. R. Astron. Soc. 257, 257 (1992)>
=1992MNRAS.257..257R
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ADC_Keywords: Clusters, open; Plate data; Proper motions
Keywords: techniques: photometric - surveys - astrometry -
stars: luminosity function, mass function -
open clusters and associations: individual: Hyades
Description:
We have used COSMOS scans of photographic plates taken by the
Palomar Oschin Schmidt telescope (as part of the original Palomar
Sky Survey) and by the UK Schmidt telescope to obtain proper
motions for ~ 450 000 stars within a 112-degree region covering
part of the Hyades cluster. With epoch differences of 33 to 37 yr,
we have obtained proper motions accurate to 6-12 mas/yr
and have identified 393 candidate Hyads to a limiting magnitude of
Mv ~ +15.5, including at least two new white dwarf candidates.
The main-sequence luminosity function determined from our sample
is similar to that defined by local field stars, with a broad
maximum at Mv ~ +12. Deriving distances from mu u, the proper
motion towards the convergent point, and the space velocity
determined by Gunn et al., we find stars with motions consistent
with membership at distances of more than 15pc from the cluster
centre. Moreover, both the line-of-sight and surface density
distributions show evidence for significant mass segregation -
indeed, the overall proper motion distribution suggests a tight
core centred within a much broader distribution. We derive a total
mass of 410-480Sun and a gravitational binding radius of ~ 10.5pc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8 79 411 Candidate Hyads
table9 53 247 Cross-references
app-a 68 220 CCD Photometric sequences
app-b 68 170 Appendix B: Giclas stars
app-c 68 507 Appendix C: Hanson stars
app-d 68 50 Appendix D: Leiden (Pels et al.) stars
app-e 68 323 Appendix E: Luyten stars
app-f 68 96 Appendix F: Leggett & Hawkins stars
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Byte-by-byte Description of file: table8
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/411]+ Running number
4 A1 --- Note [G*] Indicator: G = Galaxy,
* = near bright stars.
When this column is not blank, positions
and colors are not listed.
5 A1 --- Pr [123] Membership indicator:
1 = probable member based on
(Mv,(V-I)K) relation
2 = probable non-member based on
(Mv,(V-I)K) relation
3 = probable non-member based on
preliminary reduction of CCD data
7- 8 I2 h RAh [3/4]? Right Ascension 1950 (hours)
10- 11 I2 min RAm [0/60[? Right Ascension 1950 (minutes)
13- 17 F5.2 s RAs [0/60[? Right Ascension 1950 (seconds)
19 A1 - DE- Declination 1950 (sign)
20- 21 I2 deg DEd [9/20]? Declination 1950 (degrees)
23- 24 I2 arcmin DEm [0/60[? Declination 1950 (minutes)
26- 29 F4.1 arcsec DEs [0/60[? Declination 1950 (seconds)
31- 36 F6.3 arcsec/yr pmRA [-0.2/0.2]? Proper motion in right ascension
(* cos(DE))
38- 43 F6.3 arcsec/yr pmDE [-0.2/0.2]? Proper motion in declination
45- 50 F6.3 arcsec/yr pmU [-0.2/0.2]? Proper motion directed towards
the Hyades convergent point
(around RA=98deg,DE=+6deg)
52- 57 F6.3 arcsec/yr pmT [-0.2/0.2]? Proper motion transverse to
convergent point
59- 63 F5.2 mag V [8/20] apparent magnitude
65- 69 F5.2 mag B-V []? color index
71- 75 F5.2 mag Mv []? Absolute magnitude
77- 79 A3 --- WD White Dwarf indication
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Byte-by-byte Description of file: table9
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/411]+ Running number as in table8
6- 7 I2 --- vB [1/99]? van Bueren number (see Acronyms)
Inst. Netherlands 11, 385, 1952)
11- 13 I3 --- vA [1/780]? van Altena number (see Acronyms)
15- 17 I3 --- HA [1/620]? Hanson number (see Acronyms)
20- 27 A8 --- LP Luyten name (see Acronyms)
48"-Schmidt Telescope, LIX, Minesota
Univ., 1981)
30- 32 I3 --- LH [1/290]? Leggett & Hawkins (see Acronyms)
35- 39 A5 --- HG Giclas designation (see Acronyms)
42- 43 I2 --- Leiden [1/99]? Leiden number from Pels et al.
(see Acronyms)
46 A1 --- Ha [*YN] indicates whether the star is included
in Stauffer et al. (ApJ 374, 142, 1991)
48 A1 --- GGZG [Y?] indicated whether the star is included
in Griffin et al. (AJ 96, 172, 1988)
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Byte-by-byte Description of file: app-a
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Bytes Format Units Label Explanations
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1- 10 A10 --- Id1 First designation (see Acronyms)
12- 16 A5 --- Id2 Second designation (see Acronyms)
This field is non-blank in app-c only
18- 19 I2 h RAh Right Ascension 1950 (hours)
21- 22 I2 min RAm Right Ascension 1950 (minutes)
24- 28 F5.2 s RAs Right Ascension 1950 (seconds)
30 A1 - DE- Declination 1950 (sign)
31- 32 I2 deg DEd Declination 1950 (degrees)
34- 35 I2 arcmin DEm Declination 1950 (minutes)
37- 40 F4.1 arcsec DEs Declination 1950 (seconds)
43- 47 F5.2 mag V
49- 53 F5.2 mag B-V []? color index
56- 60 F5.2 mag V-R []? color index
63- 67 F5.2 mag V-I color index
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Byte-by-byte Description of file: app-b
Byte-by-byte Description of file: app-c
Byte-by-byte Description of file: app-d
Byte-by-byte Description of file: app-e
Byte-by-byte Description of file: app-f
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Bytes Format Units Label Explanations
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1- 10 A10 --- Id1 First designation (see Acronyms)
12- 16 A5 --- Id2 Second designation (see Acronyms)
This field is non-blank in app-c only
18- 19 I2 h RAh Right Ascension 1950 (hours)
21- 22 I2 min RAm Right Ascension 1950 (minutes)
24- 28 F5.2 s RAs Right Ascension 1950 (seconds)
30 A1 - DE- Declination 1950 (sign)
31- 32 I2 deg DEd Declination 1950 (degrees)
34- 35 I2 arcmin DEm Declination 1950 (minutes)
37- 40 F4.1 arcsec DEs Declination 1950 (seconds)
43- 47 F5.2 mag V
49- 53 F5.2 mag B-V color index
56- 61 F6.3 arcsec/yr pmRA Proper motion (*cos(DE))
63- 68 F6.3 arcsec/yr pmDE Proper motion in DE
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Acronyms: The acronyms are:
HG = Giclas (Lowell Obs. Bull. 5, 257, 1962)
vB = van Bueren (Bull. Astr. Inst. Netherlands 11, 385, 1952)
vA = van Altena number (AJ 74, 2, 1969)
HA = Hanson number (AJ 80, 379, 1975)
LP = Luyten (Proper Motion Survey with 48"-Schmidt Telescope, LIX,
Minesota Univ., 1981)
LH = Leggett & Hawkins number (MNRAS 238, 145, 1989)
Leiden = Pels et al. (A&A 43, 423, 1975)
History: Keypunched at CDS
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(End) M.J. Wagner, Francois Ochsenbein [CDS] 21-Mar-1994