J/A+A/367/111 A Hipparcos study of the Hyades cluster (de Bruijne+, 2001)
A Hipparcos study of the Hyades open cluster:
improved colour-absolute magnitude and Hertzsprung-Russell diagrams.
de Bruijne J.H.J., Hoogerwerf R., de Zeeuw P.T.
<Astron. Astrophys. 367, 111 (2001)>
=2001A&A...367..111D 2001A&A...367..111D
ADC_Keywords: Clusters, open ; Radial velocities ; Stars, distances ;
Parallaxes, trigonometric
Keywords: astrometry - stars: distances - stars: fundamental parameters -
stars: Hertzsprung-Russell diagram -
Galaxy open clusters and associations: individual: Hyades
Description:
Hipparcos trigonometric parallaxes fix distances to individual stars
in the Hyades cluster with an accuracy of about 6 percent. We use the
Hipparcos and Tycho-2 proper motions, which have a larger relative
precision than the Hipparcos trigonometric parallaxes, to derive 3
times more precise distance estimates, by assuming that all members
share the same space motion. These so-called secular parallaxes are,
as a set, statistically consistent with the Hipparcos parallaxes
(Section 6).
Table A1 contains, for all 218 members identified by Perryman et al.
(1998A&A...331...81P 1998A&A...331...81P; see also Cat. J/A+A/331/81; see Sections 4.1
and 5.1), the trigonometric parallaxes, the Hipparcos and Tycho-2
secular parallaxes, their errors and goodness-of-fit parameters
(Sections 2.2 and 5.4), as well as fundamental stellar parameters
(Section 9) based on the Hipparcos secular parallaxes and the V-band
magnitudes (field H5) and B-V colours (field H37) listed in the
Hipparcos Catalogue (1997HIP...C......0E 1997HIP...C......0E; Cat. I/239).
Table A2 lists 15 new Hyades candidates (see Sections 4.2 and 5.2)
selected by the membership methods developed by de Bruijne
(1999MNRAS.306..381D 1999MNRAS.306..381D) and Hoogerwerf et al. (1999MNRAS.306..394H 1999MNRAS.306..394H) which
use proper motion and trigonometric parallax data. Based on photometric,
radial velocity, and secular parallax data, we conclude that only one
of these stars (HIP 19757) is a likely new member (see Sections 4.2
and 5.2 for details).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 141 218 Hyades members from Perryman+
(1998, Cat. <J/A&A/331/81>)
notes.dat 79 85 Individual notes to table A1
tablea2.dat 115 15 New Hyades candidate members
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
III/190 : WEB Catalog of Radial Velocities (Duflot+ 1995)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
http://www.ari.uni-heidelberg.de/dmubin : The Δµ binary homepage
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number (field H1 in Cat. I/239)
8- 11 I4 --- TYC1 ? Tycho identifier (part 1; field T1 in
Cat. I/239; see also Cat. I/259)
13- 16 I4 --- TYC2 ? Tycho identifier (part 2)
18 I1 --- TYC3 ? Tycho identifier (part 3)
20- 24 F5.2 mas Plx Hipparcos trigonometric parallax
(field H11 in Cat. I/239)
26- 30 F5.2 mas e_Plx Standard error in Plx
(field H16 in Cat. I/239)
32- 36 F5.2 mas PlxsH Hipparcos secular parallax
38- 41 F4.2 mas e_PlxsH Error in PlxsH
43- 48 F6.2 --- q_PlxsH Goodness-of-fit parameter of PlxsH (G1)
50- 54 F5.2 mas PlxsT ? Tycho-2 secular parallax
56- 59 F4.2 mas e_PlxsT ? Error in PlxsT
61- 66 F6.2 --- q_PlxsT ? Goodness-of-fit parameter of PlxsT (G1)
68- 71 F4.2 solMass Mass Stellar mass from section 5.3 in Perryman+
(1998A&A...331...81P 1998A&A...331...81P).
See also Section 9.4.5
73- 78 F6.4 [K] logTeff ? Logarithm of effective temperature
80- 85 F6.4 [K] e_logTeff ? Error in logTeff
87- 92 F6.3 mag BCVmag ? Bolometric correction in V-band
94- 98 F5.3 mag e_BCVmag ? Error in BCVmag
100-105 F6.3 [solLum] logLum ? Logarithm of luminosity
107-111 F5.3 [solLum] e_logLum ? Error in logLum
113-117 F5.3 [cm/s2] logg ? Logarithm of surface gravity
119-123 F5.3 [cm/s2] e_logg ? Error in logg
125 I1 --- n_Mass1 [0-1] Note on stellar mass:
1: optical companion was not counted in
the mass
127 I1 --- n_Mass2 [0-1] Note on stellar mass:
1: particularly uncertain mass (from
Perryman+; 1998A&A...331...81P 1998A&A...331...81P)
129 I1 --- n_RVel [0-2] Note on binarity from radial velocities
1: spectroscopic binary (2)
2: radial velocity variable (2)
131 I1 --- n_CCDM [0-3] Hipparcos historical CCDM status flag
(field H56 in Cat. I/239) (G2)
133 I1 --- MultFlag [0-7] Hipparcos duplicity flags H59 and H61
(Cat. I/239) (G3)
135 I1 --- varType [0-5] Hipparcos photometric variability
flag H52 (Cat. I/239) (5)
137 I1 --- Cal [0-2] Flag indicating which calibration was
used to obtain logTeff, BCVmag,
logLum, and logg:
1: calibration 1 (Section 9.4.2)
2: calibration 2 (Section 9.4.3)
139 I1 --- Memb [0-8] Membership information (6)
141 I1 --- Note [0-1] Index to notes:
1: note in notes.dat file
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Note (2): The notes on binarity from radial velocities (n_RVel) were taken from
table 2 (column s) in Perryman et al. (1998A&A...331...81P 1998A&A...331...81P; see also
Cat. J/A+A/331/81).
Note (5): Hipparcos photometric variability type (HvarType; field H52 in
Cat. I/239):
0: H52=C or H52=: no variability detected ("constant") or the
entry could not be classified as variable or constant
1: H52=D: duplicity-induced variability
2: H52=M: possibly micro-variable (amplitude <0.03mag)
3: H52=P: periodic variable
4: H52=R: V-I colour index was revised due to variability analysis
5: H52=U: unsolved variable which does not fall in the other categories.
Note (6): Membership information (Memb), taken from Perryman+ (column x in
table 2; 1998A&A...331...81P 1998A&A...331...81P; Cat. J/A+A/331/81):
0: non-member
1: member based on proper motion and radial velocity
2: member based on proper motion only
3: member based on proper motion and radial velocity but rejected by
de Bruijne (1999MNRAS.306..381D 1999MNRAS.306..381D)
4: member based on proper motion and radial velocity but rejected by
Hoogerwerf+ (1999MNRAS.306..394H 1999MNRAS.306..394H)
5: member based on proper motion and radial velocity but rejected by
de Bruijne and Hoogerwerf+
6: member based on proper motion only but rejected by de Bruijne
7: member based on proper motion only but rejected by Hoogerwerf+
8: member based on proper motion only but rejected by de Bruijne and
Hoogerwerf+.
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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- 5 I5 --- HIP Hipparcos (Cat. I/239) number
7- 79 A73 --- Note Text of the note
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos identifier (field H1 in Cat. I/239)
8- 11 I4 --- TYC1 Tycho identifier (part 1; field T1 in Cat.
I/239; see also Cat. I/259)
13- 16 I4 --- TYC2 Tycho identifier (part 2)
18 I1 --- TYC3 Tycho identifier (part 3)
20- 25 F6.2 mas Plx Hipparcos trigonometric parallax
(field H11 in Cat. I/239)
27- 30 F4.2 mas e_Plx Standard error in Plx
(field H16 in Cat. I/239)
32- 37 F6.2 km/s RVel ? Radial velocity
39- 42 F4.2 km/s e_RVel ? Error in RVel
44 A1 --- r_RVel ? [1,S] Source of RVel (1)
46- 47 A2 --- n_RVel ? [RV] RV: Radial velocity variable. From
Duflot+ (1995A&AS..114..269D 1995A&AS..114..269D; Cat. III/190)
49 A1 --- n_CCDM ? [HIM] Historical CCDM status flag
(field H56 in Cat. I/239) (G2)
51 A1 --- MultFlag ? [CGOVX S] Double/Multiple Systems flag
(fields H59 and H61 in Cat. I/239) (G3)
53- 57 F5.2 pc R3D Three-dimensional distance from the cluster
center of mass defined by 180 stars (see
table 3 in Perryman+; 1998A&A...331...81P 1998A&A...331...81P),
based on Hipparcos trigonometric parallax (Plx)
59- 63 F5.2 --- Stat ? Kinematic membership statistic from
Perryman+ (1998A&A...331...81P 1998A&A...331...81P) (4)
65 I1 --- Memb1 ? [0-1] Final membership assigned by Perryman+
(1998A&A...331...81P 1998A&A...331...81P):
0: non-member
1: member (no entries in this table)
67- 70 F4.2 --- Memb2 ? [0-1] Membership `probability' from
Hoogerwerf+ (1999MNRAS.306..394H 1999MNRAS.306..394H; their
symbol S in their section 2.4)
72- 75 F4.2 --- Memb3 ? [0-1] Membership probability from de Bruijne
(1999MNRAS.306..381D 1999MNRAS.306..381D; his symbol p in his
section 2.4.4)
77- 82 F6.2 mas PlxsH Hipparcos secular parallax
84- 87 F4.2 mas e_PlxsH Error in PlxsH
89- 94 F6.2 --- q_PlxsH Goodness-of-fit parameter of PlxsH (G1)
96-101 F6.2 mas PlxsT ? Tycho-2 secular parallax
103-106 F4.2 mas e_PlxsT ? Error in PlxsT
108-113 F6.2 --- q_PlxsT ? Goodness-of-fit parameter of PlxsT (G1)
115 A1 --- Note ? Remarks (6)
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Note (1): Source of radial velocity (r_RVel):
1: Griffin+ 1977AJ.....82..176G 1977AJ.....82..176G
1978AJ.....83.1114G 1978AJ.....83.1114G
1981AJ.....86..588G 1981AJ.....86..588G
1982A&A...106..221G 1982A&A...106..221G
1985AJ.....90..609G 1985AJ.....90..609G
1988AJ.....96..172G 1988AJ.....96..172G
See table 2 (Cat. J/A+A/331/81) in Perryman+ (1998A&A...331...81P 1998A&A...331...81P)
for details
S: SIMBAD (http://cdsweb.u-strasbg.fr/Simbad.html).
Note (4): Kinematic membership statistic (Stat) from Perryman+
(1998A&A...331...81P 1998A&A...331...81P; their eq. 16). A value of 14.16 corresponds to
a 3σ deviation.
Note (6): Remarks (Note):
HIP 20777: T Tauri-type star with two components (SIMBAD);
Tycho-1 (Cat. I/239) number suppressed in Tycho-2
Catalogue (Cat. I/259)
HIP 20904: Primary component in double system (SIMBAD)
HIP 25730: T Tauri-type star (SIMBAD).
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Global notes:
Note (G1): Goodness-of-fit parameters q_PlxsH and q_PlxsT of secular
parallaxes PlxsH and PlxsT (see Section 2.2 for details). q_PlxsH > 9
and/or q_PlxsT > 9 indicate a bad fit (>3σ deviation), possibly
indicative of multiplicity and/or non-membership (Section 2.2).
Note (G2): Historical CCDM status flag (n_CCDM) indicating whether the
star was previously known or classified by Hipparcos to have resolved
components (from field H56 in Cat. I/239).
See also table 2 (column t) in Perryman+ (1998A&A...331...81P 1998A&A...331...81P; see
also Cat. J/A+A/331/81).
1 or I: H56=I: system previously identified as multiple in HIC
(Cat. I/196 annex 1)
2 or M: H56=M: miscellaneous (system identified after publication
of HIC, Cat. I/196)
3 or H: H56=H: determined multiple by Hipparcos, previously unknown.
Note (G3): Double/Multiple Systems flag (MultFlag; [CGOVX]) indicating
the relevant part of the Hipparcos Double and Multiple Systems Annex
(field H59 in Cat. I/239), supplemented by a flag indicating a
suspected binary detected by Hipparcos ([S]; field H61 in Cat.
I/239). See also table 2 (column u) in Perryman+
(1998A&A...331...81P 1998A&A...331...81P; see also Cat. J/A+A/331/81).
1 or C: H59=C: solutions for the components
2 or G: H59=G: acceleration or higher order terms
3 or O: H59=O: orbital solutions
4 or V: H59=V: variability-induced movers (apparent motion arises from
variability)
5 or X: H59=X: stochastic solution (probably astrometric binaries with
short period)
6 or S: H61=S: suspected binary in Hipparcos Catalogue (field H61)
7 : H59=X and H61=S.
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Acknowledgements: Jos de Bruijne
References:
Hoogerwerf & Aguilar, 1999MNRAS.306..394H 1999MNRAS.306..394H
de Bruijne, 1999MNRAS.306..381D 1999MNRAS.306..381D
Wielen et al., 2000, IAU Symp. 200, p144
McClure, 1982ApJ...254..606M 1982ApJ...254..606M
Lastennet et al., 1999A&A...349..485L 1999A&A...349..485L
Soederhjelm, 1999A&A...341..121S 1999A&A...341..121S
Peterson & Solensky, 1987ApJ...315..286P 1987ApJ...315..286P
Simon & Ayres, 2000ApJ...539..325S 2000ApJ...539..325S
Torres et al., 1997ApJ...485..167T 1997ApJ...485..167T
Torres et al., 1997ApJ...479..268T 1997ApJ...479..268T
(End) Patricia Bauer [CDS] 04-Dec-2000