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
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; 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; 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) and Hoogerwerf et al. (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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). 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) 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
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; 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=<BLANK>: 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; 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) 4: member based on proper motion and radial velocity but rejected by Hoogerwerf+ (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+.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 5 I5 --- HIP Hipparcos (Cat. I/239) number 7- 79 A73 --- Note Text of the note
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
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; 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), based on Hipparcos trigonometric parallax (Plx) 59- 63 F5.2 --- Stat ? Kinematic membership statistic from Perryman+ (1998A&A...331...81P) (4) 65 I1 --- Memb1 ? [0-1] Final membership assigned by Perryman+ (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; their symbol S in their section 2.4) 72- 75 F4.2 --- Memb3 ? [0-1] Membership probability from de Bruijne (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)
Note (1): Source of radial velocity (r_RVel): 1: Griffin+ 1977AJ.....82..176G 1978AJ.....83.1114G 1981AJ.....86..588G 1982A&A...106..221G 1985AJ.....90..609G 1988AJ.....96..172G See table 2 (Cat. J/A+A/331/81) in Perryman+ (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; 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).
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; 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; 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.
Acknowledgements: Jos de Bruijne References: Hoogerwerf & Aguilar, 1999MNRAS.306..394H de Bruijne, 1999MNRAS.306..381D Wielen et al., 2000, IAU Symp. 200, p144 McClure, 1982ApJ...254..606M Lastennet et al., 1999A&A...349..485L Soederhjelm, 1999A&A...341..121S Peterson & Solensky, 1987ApJ...315..286P Simon & Ayres, 2000ApJ...539..325S Torres et al., 1997ApJ...485..167T Torres et al., 1997ApJ...479..268T
(End) Patricia Bauer [CDS] 04-Dec-2000
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